FI103115B - Process for the preparation of 2-chloromethyl-saccharin - Google Patents

Description

103115

Process for the preparation of 2-chloromethyl-saccharin

The present invention relates to a process for the preparation of a female saccharin derivative useful as intermediates in the preparation of novel 2-saccharinylmethylaryl carboxylates which inhibit the enzymatic activity of proteolytic enzymes.

10 Inhibition of proteolytic enzymes by non-toxic reagents is useful in the treatment of degenerative diseases such as emphysema, rheumatoid arthritis and pancreatitis, in which proteolysis is an active factor.

Protease inhibitors are widely used in bio-15 medical research. Serine proteases are the most widely distributed class of proteolytic enzymes. Some serine proteases are characterized as chymotrypsin or elastase based on their substrate specificity.

Chymotrypsin and chymotrypsin-like enzymes normally cleave peptide bonds in proteins at the point where the amino acid residue on the carboxyl side is typically Trp, Tyr, Phe, Met, Leu or other amino acid residue containing aromatic or large alkyl side chains: 25.

Elastase and elastase-like enzymes normally cleave peptide bonds at the point where the amino acid residue on the carboxyl side of the bond is typically Ala, Val, Ser, Leu, or the like, a smaller amino acid.

Both chymotrypsin-like and elastase-potassium enzymes are present in white blood cells, mast cells, and pancreatic fluid in higher organisms and are secreted by many types of bacteria, yeasts and parasites.

JP-A-2 103115 discloses numerous 2-saccharinylmethyl benzoates, including 2-saccharinylmethyl benzoate per se, and 2-saccharinylmethyl 2,4-dichlorobenzoate and -4-nitrobenzoate.

The compounds are said to have "potent activity against rice plague, rice film plague, rice leaf disease and rice bacterial leaf disease".

Sunkel et al., J. Med. Chem. 31, 1886-1890 (1988), disclose a series of 2-saccharinyl (lower alkyl) -1,4-di-10 hydropyridine-3-carboxylates having platelet aggregation inhibiting and anticoagulant activities.

Chen discloses various 2-aroylmethyl saccharines useful as "photographic agents and film units" in U.S. Patent No. 4,263,393.

Mulvey et al., U.S. Patent 4,195,023, disclose R1-2-R2CO-1,2-benzisothiazol-3-ones wherein Rx is halogen, alkoxy, alkylamino, dialkylamino, alkoxycarbonyl, amino, nitro or hydrogen benzenoidene. -20, and R 2 is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, halophenyl, heteroaryl or substituted-heteroaryl, and R 1 -2 -A-CO-saccharines wherein R 44 has the same meaning as benzenoid ring substituents - la in 1,2-benzisothiazol-3-one and A is alkyl, alkenyl, alkynyl, cycloalkyl, fluorophenyl, heteroaryl or substituted heteroaryl. The compounds are said to have elastase inhibitory activity and are said to be useful in the treatment of emphysema.

30 Zimmerman et al., J, Biol. Chem. 225: 20 (1980); ... 9848-9851 disclose N-acyl saccharines in which the acyl group is furoyl, tenoyl, benzoyl, cyclopropanoyl, ethylbutyryl and acryloyl, and which possess serine protease inhibitory activity.

3,310,115 JP 73/35457 discloses 4-methylphenyl-2-saccharinylcarboxylate which is said to have antibacterial and antifungal activities.

Several classes of compounds are known to be serine protease inhibitors. For example, Powers discloses arylsulfonyl fluoride derivatives useful as elastase inhibitors in U.S. Patent No. 4,659,855. Doherty et al., U.S. Patent Nos. 10,447,371 and 4,623,645, disclose cephalosporin sulfones and sulfoxides, respectively, which are said to be potent elastase inhibitors useful in the treatment of inflammatory conditions, particularly arthritis and emphysema.

15 Teshima et al., J.Blol.Chem. 257: 9 (1982) 5085-5091, reported the results of studies on serine proteases (human white cell elastase, porcine elastase, cathepsin G and bovine chymotrypsin Ae) using 4-nitrophenyl esters and 2-thioesters of N-trifluoroacetyl anthranilates, 4H-3,1-benzoxazin-4-ones, 2-substituted 4-quinazolinones and 2-substituted 4-chloroquinazolines.

Cha, Biochem.Pharmacol. 24, 2177-2155 (1975), discusses kinetic approaches for studying the binding of inhibitors to macromolecules such as enzymes, and methods for determining parameters such as inhibition constants, reaction rates, and concentrations of bound and non-bound enzymes.

Jones et al., U.S. Patent No. 4,276,298, Jul-30, discloses 2-R1, 2-benzisothiazolinone-1,1-dioxides wherein R is phenyl substituted with fluorine, dinitro, trifluoromethyl, cyano, alkoxycarbonyl, alkylcarbonyl, carboxyl, carbamoyl, alkylacylamino, alkylsulfonyl, N, N-35 dialkylsulfamoyl, trifluoromethoxy, trifluoromethylthio, trifluoromethylsulfonyl, 3-trifluoromethyl, 4-trifluoromethyl, as well as when RR is phenyl, except that pyridyl may also be mononitrosubstituted. The compounds are said to have protease enzyme inhibitory activity, particularly elastase inhibitory activity, and are said to be useful in the treatment of pulmonary dilatation, rheumatoid arthritis and "other inflammatory diseases".

Powers, Biochem. 24, 2048-2058 (1985), disclose studies with inhibitors of four chymotrypsin-like enzymes, 10 cathepsin G, rat mast cell proteases I and II, human skin chymase and chymotrypsin Aa, N-furoyl saccharin and N- (2, 4-dicyanophenyl) the precipitate-serine.

Svoboda et al., Coll.Czech ♦ Chem.Commun ♦ 51, 15, 1133-1139 (1986) disclose the preparation of 4-hydroxy-2H-1,2-benzothiazine-3-carboxylates using 2H-1,2-benz Mole-intracellular Dieckmann condensation of isothiazol-3-one-2-acetate-1,1-dioxide esters.

Reczek et al., U.S. Patent Nos. 4,350,752 and 20,436,63865, and Vanmeter et al., U.S. Patent 4,410,618, disclose photographic reagents (Reczek 4,350,752 and Vanmeter et al.) And photographic dyes (Reczek 4,363,865). ) and disclose various 2-substituted saccharines useful for such use applications, for example "photographic reagents" bound through a heteroatom to the "imidomethyl salsa" group (Reczek 4 350 752), "carrier diffusing photographic dyes", bonded to the nitrogen atom of the imide via a 1,1-alkylene group (Reczek 4,363,865), and 30 N-acylmethylimides, described as "blocked photographic reagents" and having "an organic photographic reagent residue containing a heteroatom it is tied to a latch group "(Vanmeter).

Freed discloses in U.S. Patent No. 3,314,960 35 2- (1,1,3-trioxo-1,2-benzisothiazol-2-yl) glutarimide * * <5,103,115, which are said to be useful as tranquilizers. .

2-Chloromethylsaccharin is disclosed in FR Patent 1,451,417 as an intermediate for the preparation of N-methylsaccharin-5d, 1-trans-chrysanthemate useful as an insecticide, and US Patent 3,002,884 to Lo discloses 2-chloro, 2-bromo and 2-iodomethyl-saccharines useful as antifungal agents.

Chemical Abstracts III: 19407e and 112: 35254u describe a process for the preparation of chloromethyl ethers and sulfides starting from alcohols and thiols. However, these references in no way suggest the application of such a reaction to cyclic amine-15 to prepare N-chloromethylamine.

4-R4-R5-2-saccharinylmethylaryl acryloxylates and 4,5,5,7,7-tetrahydro-2-saccharinylmethylaryl carboxylates have protease enzyme inhibitory activity and are useful in the treatment of degenerative diseases.

Said 4-R 4 -R-2-saccharinylmethylaryl carboxylates and 4,5,6,7-tetrahydro-2-saccharinylmethylaryl carboxylates are prepared by reacting (1) 2-halo-methylmethylsacrine with an arylcarboxylic acid in the acid acceptor , or (2) reacting the saccharin with the chloromethyl ester of arylcarboxylic acid in the presence of an acid acceptor, or (3) reacting the alkali metal or potassium salt of the appropriate acid with the appropriate halo-30 gene methyl compound.

. The invention relates to a process for the preparation of 2-chloromethyl saccharines useful as intermediates for the preparation of 2-saccharinyl methyl aryl carboxylates.

The present invention relates to a process for the preparation of 2-chloromethylsaccharin of the formula: 6 103115 Γ f R 5b ~ T (Τ 'n-ch 2 Cl 5 O 2 O).

Wherein R 4c is hydrogen, halogen, lower alkyl, perfluoro (lower alkyl), perchloro (lower alkyl), lower alk-10-yl, di (lower alkyl) amino, (lower alkyl) oxy or phenyl; R 5b is hydrogen, or one to two substituents at any position 5, 6 or 7 independently selected from the group consisting of halogen, cyano, nitro, 15-N = B ', 1- (lower alkyl) -2-pyrrolyl, lower alkyl, polyfluoro (lower alkyl), polychloro (lower alkyl), cycloalkyl, lower alkoxy, methylenedioxy, cycloalkyloxy, (lower alkyl) sulfonyl, (lower alkoxy) poly (lower alkylene) oxy, acetal or ketal of: polyhydroxy (lower alkoxy), poly (lower alkoxy) - (lower alkoxy), (lower alkyl) thio, (lower alkyl) sulfinyl, (lower alkoxy) carbonyl, -O- (alkylene) -C00- (lower alkyl), and -O - (alkylene) -N = B ', and -N = B' is di (lower alkyl) amino, 1-pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 4- (lower alkyl) -1-piperazinyl, or 4-benzyl-l-piperazinyl.

The process is characterized in that saccharin of the formula: 30 R46 o

R5b-r (Τ 'NH

357 103115 is reacted with chlorosilane and formaldehyde or formaldehyde equivalents in the presence of a Lewis acid.

The compounds of the invention may be used as starting materials for the preparation of 4-R4-R5-2-precipitate-5-vinylmethylaryl carboxylates of the formula: Ϊ ° J0, »m R5-j-N-CH2OC-Ar10.

O * "" O

where:

Ar is phenyl, naphthyl or anthryl, or any one of these groups substituted by one to three members of the same or different moiety selected from the group consisting of lower alkyl, perfluoro (lower alkyl), perchloro (lower alkyl), lower alkoxy, halogen, nitro , cyano, carboxyl, -PO- (lower alkoxy) 2, amino, (lower alkyl) amino, di (lower alkyl) amino, (lower alkanoyl) amino, (lower alkoxy) carbonyl, hydroxyl, benzyloxy, carboxyl (lower alkoxy), -SO 2 -N = B, -CO-N = B, - (alkylene) -N = B, -COO (alkylene) -N = B, -NH (alkylene) -N = B ; -N- (lower alkyl) - (alkylene) -N = B or -O- (alkylene) -N = B, wherein in each case N * B is amino, (lower alkyl) amino, di (lower alkyl) amino, 1-azetidinyl, 1-pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 1-piperazinyl, 4- (lower alkyl) -1-piperazinyl, 4-benzyl-1-piperazinyl, 1-imidazolyl, carboxy ( lower alkyl) amino or -NR- (alkylene) -N (alkyl-1) 2 / wherein R is lower alkyl; R 4 is hydrogen, halogen, lower alkyl, perfluoro (lower alkyl), perchloro (lower alkyl), lower alkenyl, lower alkynyl, cyano, amino, (lower alkyl) -35 amino, di (lower alkyl) amino, lower alkoxy, benzyl-8-103,115 oxy, (lower alkoxy) carbonyl or phenyl or carboxamido; and R 5 is hydrogen or one to two identical or different substituents at any position 5 5, 6 or 7 selected from the group consisting of halogen, cyano, nitro, N = B, 1- (lower alkyl) -2-pyrrolyl , (lower alkyl) sulfonylamino, polyfluoro (lower alkyl) sulfonylamino, polychloro (lower alkyl) sulfonylamino, aminosulfonyl, lower alkyl, polyfluoro (lower alkyl), polychloro (lower alkyl), cycloalkyl, lower alpha coke, hydroxyl, carboxyl, carboxamido, hydroxy (lower alkyl), methylenedioxy, cycloalkyloxy, formyl, aminomethyl, (lower alkyl) sulfonyl, polyfluoro (lower alkyl) sulfonyl, polychloro (lower alkyl) -15 sulfonyl, ( lower alkyl) sulfonylaminosulfonyl, di (lower alkyl) phosphonooxy, (lower alkoxy) polyalkyleneoxy, hydroxy (lower alkoxy), polyhydroxy (lower alkoxy), or acetal or ketal thereof, poly (lower alkoxy) - (lower alkoxy), - O- (alkylene) -C00R, -O- (alkyl-20ene-N = B, -SR, -SO0, -SO 2R, -OCO, wherein R is lower alkyl, phenyl, benzyl or naphthyl, or phenyl or naphthyl substituted with one to two substituents selected from lower alkyl, lower alkoxy or halogen, and -NB is defined as above, Or R5 is a 5- or 6-membered saturated ring fused to saccharin at positions 5,6 or 6,7, wherein said ring contains two heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur, or a methylated derivative of said ring. ; Or the acid addition salts or the acid addition salts of basic saccharinylmethyl carboxylates: provided that when R 4 and R 5 are both hydrogen, Ar cannot be phenyl, 2,4-dichlorophenyl or 4-nitrophenyl.

Preferred compounds of formula I above are compounds wherein: • 9 103115

Ar is phenyl, naphthyl or anthryl, or such a group substituted with one to three identical or different members of the group consisting of lower alkyl, perfluoro (lower alkyl), lower alkoxy, halogen, nitro, PO- (lower alkoxy) 2, ( lower alkanoyl-amino, hydro-carbonyl, carboxy (lower-alkoxy, benzyloxy, -SO 2 -N = B or -O- (alkylene-N = B), where N = B is di- (lower alkyl) amino, 1- pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 1-piperazinyl, carboxy (almepi alkyl) 10 amino, or -NR- (alkylene-N- (alkyl) 2 where r is lower alkyl; R 4 is hydrogen, primary or secondary lower alkyl, lower alkoxy or phenyl, and R 5 is hydrogen, hydroxyl, lower alkoxy, methylenedioxy, cycloalkyloxy, hydroxy (lower alkoxy), polyhydroxy (lower alkoxy), or acetal or ketal, poly (lower alkoxy) thereof; ) - (lower alkoxy), -O- (alkylene) -C00R or O- (alkylene) -N = B or R5 is a [6,5-g] fused 1,3-oxazine.

Particularly preferred compounds of formula I are compounds wherein:

Ar is phenyl or phenyl substituted with one to three identical or different members from the group consisting of lower alkyl, lower alkoxy, halogen, hydroxyl, carboxy (lower alkoxy), benzyloxy, -SO 2 -N = B or -O- (alkylene) -N = B wherein N = B is di- (lower alkyl) amino, 1-pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 1-piperazinyl, 4- (lower alkyl) -1-piperazinyl, 4- benzyl-1-piperazinyl, carboxy-30 (lower alkyl) amino, or -NR- (alkylene) -N- (alkyl) 2 -, wherein R is lower alkyl; R 4 is primary or secondary lower alkyl or lower alkoxy; and R5 is hydrogen, lower alkoxy, methylenedioxy, cycloalkoxy, hydroxy (lower alkoxy), polyhydroxy 10 103115 (lower alkoxy), or an acetal or ketal of said lower (lower alkoxy), - O- (alkylene) -COOR or -O- (alkylene) -N = B.

Other preferred compounds of formula I include compounds wherein:

Ar is phenyl, naphthyl or anthryl, or phenyl substituted with one to three members, the same or different, from the group consisting of lower alkyl, perfluoro (lower alkyl), lower alkoxy, halo-10 gene or (lower alkanoyl) amino; R 4 is hydrogen, primary or secondary lower alkyl, lower alkoxy or phenyl; and R 5 is hydrogen or lower alkoxy.

Still other preferred compounds of formula I are compounds wherein:

Ar is phenyl or phenyl substituted with one to three identical or different members of the group consisting of lower alkoxy, halogen or lower alkyl; R 4 is hydrogen, primary or secondary lower alkyl or lower alkoxy; and R 5 is hydroxyl at any position 5, 6 or 7.

Compounds of the general formula I are commonly referred to in the chemical literature as 1,2-benzisothiazol-3 (2H) -one-1,1-dioxide. However, for the sake of brevity, such compounds are often referred to as saccharin derivatives, and such designation will hereinafter be used to describe the compounds of the invention and their biological properties.

The end products also include 4,5,6,7-tetrahydro-2-saccharinylmethylaryl carboxylates having the formula vi: 35 4 · «.

,, 103115 "X * 8 1! L / N-cH2oc_Ar 5 R O '

VI

wherein R 4 'is hydrogen or lower alkyl or phenyl, R 6 is hydrogen or lower lower alkyl, or R 4 and R 6 together form a spirocyclopropyl ring, R 7 is hydrogen or almep 1 alkoxy, and Ar is defined as in Formula I.

Preferred tetrahydrosaccharines of formula VI are those wherein R 4 * is hydrogen, methyl, ethyl or isopropyl, R 6 is hydrogen or methyl, R 7 is hydrogen or methoxy and Ar is phenyl substituted with one to three same or different members a group consisting of lower alkyl, lower alkoxy, halogen, hydroxyl and -O- (alkylene) -N = B.

The final products also include compounds of the formula:

Wherein A is methylene, ethylene or dimethylmethylene and Ar is phenyl, naphthyl or anthryl, or such a group substituted by one to three identical or different members of the group consisting of lower alkyl , perfluoro (lower alkyl), perchloro (lower alkyl), lower alkoxy, halogen, nitro, cyano, carboxyl, PO (lower alkoxy) 2, amino, (lower 35 alkyl) amino, di (lower alkyl) amino, (lower alkanoyl-? 12 103115 l) amino, (lower alkoxy) carbonyl, hydorksyl, benzyloxy, carboxy (lower alkoxy), -SO 2 -NB, -CO-NB - (alkylene) -N 'B, -COO ( alkylene) -N = B, -NH (alkylene / -NB; -N- (lower alkyl) - (alkylene) -N = B; or -O- (alkylene) -5 N = B, where N »B is in each case amino, (lower alkyl) amino, di (lower alkyl) amino, 1-azetidinyl, 1-pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 1-piperazinyl, 4- (lower alkyl) -1-piperazinyl, 4- Benzyl-1-piperazinyl, 1-imidazolyl, carboxy (lower 10 alkyl) amino or -NR- (alkylene) -N (alkyl) 2.

As used herein, the terms "lower alkyl", "lower alkoxy" and "lower alkane" refer to monovalent aliphatic radicals - including branched-chain radicals - having from 1 to 10 carbon atoms. Thus, the (lower alkyl) - [or (lower alkane) -] moiety of such groups is, for example, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, t-butyl, n-pentyl, 2-methyl-3 -butyl, 1-methylbutyl, 2-methylbutyl, neopentyl, n-hexyl, 1-methylpent-20-yl, 3-methylpentyl, 1-ethylbutyl, 2-ethylbutyl, 2-hexyl, 3-hexyl, 1,1, 3,3-tetramethylpentyl, 1,1-dimethyloctyl or the like.

As used herein, the term "halogen" means fluorine, chlorine, bromine or iodine.

As used herein, the terms "lower alkenyl" and "lower alkynyl" refer to monovalent, unsaturated radicals - including branched-chain radicals - having 2 to 10 carbon atoms and thus 1-ethenyl, 1- (2-propenyl). ), 1- (2-Bute-30-yl), 1- (1-methyl-2-propenyl), 1- (4-methyl-2-pent-1-yl), 4,4,6-trimethyl-2 -heptenyl, 1-ethynyl, 1- (2-propynyl), 1- (2-butynyl), 1- (1-methyl-2-propynyl), 1- (4-methyl-2-pentynyl) and the like.

As used herein, the term "alkylene" refers to divalent saturated radicals - including> 13 103115 branched-chain radicals - having 2 to 10 carbon atoms and having free valences on different carbon atoms and thus 1,2-ethylene, 1,3-propylene, 1,4-butylene, 1-methyl-1,2-ethylene, 1,8-octyl-5-ylene and the like.

As used herein, "cycloalkyl" refers to saturated monocyclic hydrocarbon radicals having from three to seven carbon atoms, including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl 10, and cycloheptyl.

The compounds of the present invention inhibit the activity of serine proteases, specifically enzymes such as human white blood cell elastase and chymotrypsin, whereby they are useful in the treatment of degenerative diseases, such as pulmonary dilatation, rheumatoid arthritis, cystitis, cystitis. in the treatment of blistering rash and alpha-1-antitrypsin deficiency.

Compounds of Formula I and Formula VI are prepared by reacting 2-halomethyl-saccharin or 2-halomethyl-4,5,6,7-tetrahydrosaccharin with an appropriate arylcarboxylic acid, Ar-COOH, or reacting the saccharine or tetrahydrosaccharin with arylcarboxylic acid with.

I 0 ·· 30, ΑΧ fl r ~ CO-cHjocAr T CT ^ 0 HOOCAr. 1 υ or this • · »

6 O

14 103115 XU 8 1 II / -C »20C» r 5 VIIt vi tr xo

O

II

ClCN2OCAr .Aa Vi

^> s .JJL-C

15 11 CT O

VII

The reaction may be carried out, for example, in the presence of an acid acceptor such as an alkali metal carbonate, tri (lower alkyl) amine or 1,8-diazabicyclo [5.4.0] -undes-7-ene, which is further abbreviated as DBU. Alternatively, an alkali metal salt of arylcarboxylic acid, especially a salt of thallium (1) or thallium (1) (prepared by reacting the acid with an alkali metal) may be used. The reaction is carried out in an organic solvent. 25 which is inert under the reaction conditions used, such as acetone, methyl ethyl ketone (MEK), acetone triil, tetrahydrofuran (THF), diethyl ether, dimethylformamide (DMF), N-methylpyrrolidinone, methylene dichloride (MDC), in toluene 30 or a lower alkanol at a temperature of from: - ambient temperature to the boiling point of the solvent used.

The 4-R 1 -R 5-2 -halomethyl saccharines required for the preparation of compounds of formula I are prepared by the methods described by D'Alelio et al., J.Macromol.Sci-Chem. A3: 5, 941 (1969), and Saari et al., ·; J. Het. 23: 1253 (1986).

15, 103115. R4? -COOalk

i, c ° 0H ,, / Y

ζΛ K0H AANH! 5 NH *

NaNO 2 / HCl, r 10 r. R4 4 R4? And -COOAlk * · <χ -Sr- 'Όν,

S02C1 [_ J

15

NH 4 OH

1r ”Is ΧΛ h2co r5H- n-ch2oh r u. L ^ N «H - v ^ s; Αλ o * °

O '0V

.: 25 n (H2CO) n / SnCl4 / Me3SiCl III

\ sox2 \ this

PhSCH2X N. PX3 \ '\ 30 -, 4

nA 0. ^ * O

SO 2 X 2 - R 5 - + 11 N-CH 2 X

R5 Γ lT N «CH2SPh VAs, 0 * 0 35 0 * ° 16 103115

In the method described by the island, the methyl ester of the appropriate anthranilic acid is prepared from conventionally substituted anthranilic acid followed by diazotization of the ester. The diazonium salt is then reacted with sulfur dioxide and copper (2) chloride to give the sulfonyl chloride, which is then reacted with concentrated ammonium hydroxide to provide the substituted saccharin derivatives of formula II. The latter give, by reaction with formaldehyde-10 (lower alkanol) in a solvent, the 4-R4-R5-2-hydroxymethyl saccharines of the formula III which, by reaction with thionyl halide or phosphorus trihalide, give the corresponding 4-R4-R5-2 halogenomethyl saccharines of formula IV .

The 4-R4-R5-2-halomethyl saccharines of formula IV wherein X is chlorine or bromine may also be prepared by reacting the corresponding 4-R4-R5-2-phenylthiomethyl saccharin with a sulfuryl halide in an inert organic solvent, e.g. -20 in dichloride (EDC) or carbon tetrachloride at a temperature of about 0 ° C to about 30 ° C. The 4-R4-R5-2-phenylthiomethyl-saccharines, in turn, are prepared by reacting the 4-R4-R5-saccharin of formula II with halomethylphenylsulfide in an inert organic solvent, such as toluene, xylene, DMF or MDC at temperature. from the ambient temperature to the boiling point of the solvent used. The reaction may be carried out by reacting the halomethylphenylsulfide with either the thallium salt of the saccharin derivative of the formula II. 30a (which is prepared by reacting a saccharin derivative · 'with thallium (lower alkoxide) in a lower alkanol); or the di (lower alkyl) ammonium salt of the saccharin derivatives (prepared as described below) in the presence of a tetra (lower alkyl) ammonium halide such as 35 tetrabutylammonium bromide (hereinafter TBAB), 17,103,115; or with a saccharin derivative of the Formula II in the presence of tetra (lower alkyl) ammonium halide per se; or with a saccharine derivative of the Formula II in the presence of tetra (lower alkyl) ammonium halide-5 and an alkali metal (lower alkoxide) such as potassium t-butoxide.

In the process of the invention, the saccharines of the formula II are converted into the chloromethyl saccharine of the formula IV, wherein X is Cl, in step 10 by reaction with excess formaldehyde or formaldehyde equivalent such as paraformaldehyde or 1,3,5-trioxane, and chlorosilane -lanane, a preferably catalytic amount of Lewis acid in the presence of tin (4) chloride, in an inert solvent, preferably 1,2-dichloroethane (ethylene dichloride, EDC).

All conversions of saccharines II to 2-chloromethyl-saccharines IV are equally suitable for the conversion of tetrahydrosaccharines VII to 2-chloromethyl-tetrahydrosaccharines VIII.

Compounds of formula II may also be prepared by reacting 2-R4-R5-N, N-di (lower alkyl) benzamide of formula V with one molar equivalent of (lower alkyl) alkali metal such as lithium, optionally in the presence of tetra (lower alkyl) ethylenediamine. , in an inert organic solvent, for example THF, and reacting the resulting alkali metal salt with either sulfur dioxide at -50 ° C to 80 ° C, followed by reaction of the resulting alkali metal sulfinate with hydroxylamine-O-sulfonic acid in the presence of a base, or sulfuryl halide V. When using the sulfur dioxide-hydroxylamine-O-sulfonic acid pathway, it is particularly preferable to neutralize the hydroxylamine-O-sulfonic acid with one equivalent of sodium hydroxide before adding the alkali metal sulfinate 35 The subsequent 2-R4-R5-6-aminosulfonyl-N, N-di (lower • 1 18 103115 alkyl) benzamide is heated in an acidic in 4-R4-R5-saccharin of the archipelago cyclization of the latter the desired Formula II, a di (lower alkyl) to yield an ammonium salt which can be used as such in the next five reaction or, if desired, can be hydrolyzed in dilute acid and the free saccharin isolated. Preferably, the cyclization is effected by refluxing in glacial acetic acid. The process is illustrated below, wherein R4, R5 and Alk are defined as above and the alkali-10 thallium is lithium.

f I f s RS-f T —Alk-Ll, ϋΓΥ

15 (1) so, k IL

(2) nh2oso3h ^^^ so2nh2

V

or (1) so2x2 (2) NH3 it 20

Compounds of Formula II wherein R 4 is either primary or secondary lower alkyl and which are useful as intermediates for the preparation of compounds of Formula I; as described above, is prepared by either of two methods. Compounds of formula II wherein R 4 is primary lower alkyl are prepared by reacting 4-methyl-R 5 saccharin (formula II, R 4 is CH 3) with two molar equivalents of (lower alkyl) alkali metal such as lithium in an inert organic solvent, e.g. In THF, then, ·. the resulting alkali metal salt is reacted with one molar equivalent of (lower alkyl) halide, whereby both reactions are carried out at -50 ° C to -80 ° C.

According to another process, for the preparation of compounds of formula II wherein R 4 is either primary or secondary primary alkyl, 2- (primary lower alkyl) -R 5 -N, N-di (lower alkyl) benzamide (Formula V , R 4 is primary lower alkyl) is reacted with one molar equivalent of (lower alkyl) alkali metal 5 or an alkali metal (lower alkyl) amide in which the alkali metal is especially lithium, optionally in the presence of tetra (lower alkyl) ethylenediamine, e.g. followed by reacting the resulting alkali metal salt with one molar equivalent of (lower alkyl) halide at a temperature of about -50 ° C to -80 ° C. Subsequently, the resulting 2- (primary or secondary lower alkyl) -R 5 -N, N-di (lower alkyl) benzamide is converted to compounds of formula II wherein R 4 is primary or secondary lower alkyl using the same reaction sequence as described above, i.e. reacting 2- (primary or secondary lower alkyl) -R 5 -N, N-di (lower alkyl) benzamide with one molar equivalent of (lower alkyl) alkali metal such as lithium; reacting the resulting alkali metal salt with either sulfur dioxide and then hydroxylamine-O-sulfonic acid in the presence of a base or sulfuryl halide and then ammonia; followed by cyclization of the product to the desired 4- (primary or secondary lower alkyl) -R5-saccharinic acid of formula II. When the 2- (lower alkyl) group in the 2- (lower alkyl) -R5-N, N-di (lower alkyl) benzamide starting material is methyl, the alkylation yields a compound in which the 2- (lower alkyl) group is either straight or branched whether alkylation is straight-chain or branched. . 30 lower (lower alkyl) halide. On the other hand, when the 2- (lower alkyl) group in the starting material contains more than one carbon atom, the alkylation takes place on the carbon atom adjacent to the benzene ring to form products having a secondary (lower al-35 alkyl) group at the 2-position.

• · 20 103115

In a particularly useful process for the preparation of compounds of formula II wherein R 4 is n- (lower alkyl) and R 5 is hydrogen, the benzyl protons of starting material V are protected by a trialkylsilyl group, whereby metalation such as lithiation at position 6 and sulfonamide formation can be performed.

R8 | (Alk) 3Si \ ^ R8 CH O I || 10 Γ JrMAlk), A_CN (Alk, 2

I I II ClSi (Alk) 3 || I

R 8 CH 2 0 (Alk) 3 Si 4 - / R 8: - $ c 2 - n - (lower alkyl) benzamide, where R 8 is lower alkyl, is silylated by formation of a benzyl anion using an alkyl alkali metal or preferably an alkali metal 1-dialkyl amide, wherein the alkali metal is especially lithium in an inert solvent, preferably THF, and treatment with a suitable chlorotrialkylsilane, preferably chlorotrimethylsilane. The saccharin is synthesized as above and the silyl group is removed by treatment with a source of fluoride anion, preferably with cesium fluoride in DMF or with tetra-n-butylammonium fluoride in an inert solvent.

In some cases, additional saccharide • · 21 103115 in the two rings forming the nickel or tetrahydrosaccharine nucleus must be constructed in order to obtain certain required intermediates. Thus, for the preparation of saccharines wherein R 1 is lower alkoxy and R 5 is 7-hydroxy, or tetrahydrosaccharines where R 7 is lower alkoxy, the following synthesis may be used: (SCH 2 CH 2 COOH) 2 - (SCH 2 CH 2 CONHB 2) 2

(2) peracid iO

AlkO ΦΠ °

A <1> ci A

N, N-SAlk? P, N, Bzl - c (2) peracid / J /% <3> W Cl, 3 H0 0 3,3-Dithiobispropionic acid is converted to bis acid chloride by reacting the acid with thionyl chloride. the acid chloride is then reacted with two molar equivalents of benzylamine to give bis-N-benzylamide. The latter is obtained by reaction with sulfuryl chloride in an organic solvent such as ··· MDC, EDC or carbon tetrachloride, 5-chloro-2-benzyl-2H-isothiazol-3-one, which is oxidized with one molar equivalent of peracid such as perbenzoic acid or 3-chloroperoxide. benzoic acid, 5-chloro-2-benzyl-2H-isothiazol-3-one-1-oxide. The latter is obtained by heating under reduced pressure with 2- (lower alkoxy) furan in an organic solvent such as benzene, toluene or xylene, 4- (lower alkoxy) -7-hydroxy-2-benzyl-1,2- benzisothiazol-2H-3-one-l-oxide. The 7-hydroxy group can then be reacted, if desired, with (lower alkyl) halide or (lower alkoxy) poly (lower alkoxy) - (lower 22 103115 alkyl) halide to give the corresponding 4,7-di (lower alkoxy) - or 4- (lower alkoxy) -7- (lower alkoxy) poly (lower alkoxy) -2-benzyl-1,2-benzisothiazole-2H-3-one 1-oxide. Further oxidation of the product with one to five molar equivalents of peracid as described above and then catalytic debenzylation as the transition hydrogenation affords the corresponding 4- (lower alkoxy) -7-hydroxysaccharines.

If tetrahydrosaccharin is desired, the following modification is used:

O

A- N-Bzl c ^ s'

c II

O

h2o2 20

R «. , and I

25 2> H C1% O o (H] 30

'R6 n n4a, O

,> vA 'XU,

I 1 / 'BZl -' I NH

35 \. X

, 9 23 103115 5-Chloro-2-benzyl-2H-isothiazol-3-one 1-oxide can be oxidized with a suitable oxidant, preferably hydrogen peroxide in acetic acid, to 1,1-dioxide, which is then reacted under typical Diels Alder conditions. 5 with the appropriate diene and reduced to give 2-benzyltetrahydrosaccharin, which is hydrogenated as above to tetrahydrosaccharin,

Compounds of formula II wherein R * is lower alkyl or phenyl and R 5 is hydrogen may be synthesized by 10 alternative routes from 2-cyclohexenone: R <

ai .COOMe 1) (R *); CuX

Q 2) HMPA / NCCOOMe 15 υ

Bz 15H

Montmorillonite KSF

20 R <R 'r <

JyCOTe ddq A / 00 ”* l, COOMe ^ Nb,! W'SB.X ^ CASBz1 • 25 C12 / HOAc / H20 R4 1 .COOMe 30 ^^^ 50201 2-Cyclohexenone is reacted with the target-35 cuprate and then with the methyl cyanoform »24 103115 according to Winkler et al. (Tetrahedron Lett. 1987, 1051 and J. Org. Chem. 54, 4491 (1989)). The resulting β-ketoester is reacted with benzyl mercaptan in the presence of acidic clay montmorillonite-CSF-5 to give a mixture of the benzylthioenol ether regional isomers. The mixture is aromatized by treatment with dichloro-cyanobenzoquinone (DDQ) and oxidized with aqueous chlorine gas to give the sulfonyl chloride ester, which can then be converted to Intermediate II as described above.

4,5,6,7-Tetrahydrosaccharines, which are starting materials for the compounds of formula VI wherein R 7 is hydrogen, are synthesized in a similar manner to the foregoing: i | : «•« • · 25 103115 R6 p (R <a) 2CuLi p> </ COOMe kA0 ~ KAo

BzlSH

10 4a 6 r «X R6 R \ / R

'^ X ^^ COOMe' XT ^ COOMe 15

Cl 2 / HOAc / H20

p 4 a p6 R \ - R

20 X ^ COOHe X ^ COOMe

Xi ^ SOjCl ^^ - SOjCl

1) NH4OH

2) NaOMe / MeOH

.: 25

"> <X

... ”UL / '

• C

103 -115 3-alkyl-2-cyclohexenone is reacted with the appropriate alkyl lithium cuprate in a volatile solvent, preferably diethyl ether, at -50 to + 20 ° C, preferably at about 0 ° C, followed by treatment in situ with methyl cyano formate and hexamethylphosphoramide. The thus prepared 6,6-dialkyl-2-oxocyclohexanecarboxylate is reacted with benzyl mercaptan as described above and the mixture of 2- (benzylthio) cyclohexanecarboxylates 10 is oxidatively chlorinated as described above to give a mixture of the chlorosulfonyl esters of the mixture with the To obtain 4,5,6,7-tetrahydrosaccharines.

Arylcarboxylic acids, Ar-COOH, used to prepare the final products of formulas I and VI are of the known class and can be prepared by known, conventional synthetic methods.

The chloromethyl esters of arylcarboxylic acid may be prepared by treating the carboxylic acid with formaldehyde or formaldehyde equivalent, preferably para-formaldehyde, in the presence of (1) hydrochloric acid, preferably zinc chloride or hydrochloric acid, or (2) trimethylsilyl chloride (4).

In standard biological assays, compounds of Formulas I and VI 25 have been found to have inhibitory activities against human white cellulase elastase (HLE) and chymotrypsin, and are thus useful in the treatment of degenerative diseases such as emphysema, rheumatoid arthritis, cystic fibrosis, cystic fibrosis, n, inflammatory bowel disease, desquamation, vesicular dermatitis and alpha-1-antitrypsin deficiency.

The molecular structures of the compounds of the invention were determined by studying their infrared and nmr spectra. Structures were confirmed to correlate between calculated and <27 103115 values by elemental analyzes or by analyzing high resolution mass spectra.

The following examples further illustrate the invention without, however, limiting the scope thereof. All sun-5 lameness points are uncorrected.

Manufacture of starting materials

Preparation 18B and Table B illustrate the process of the invention.

PREPARATION 1 10 Powdered potassium hydroxide (7.4 g, 0.132 mol) was mixed with dimethyl sulfoxide (DMSO) (100 mL) and the mixture was stirred for 5 minutes. 6-Methyl anthranilic acid (10.0 g, 0.066 mol) was then added and iodomethane (4.52 ml, 0.073 mol) was added dropwise.

After stirring for 30 minutes at room temperature, the reaction mixture was diluted with 250 ml of ether, washed with water (3 x 100 ml), dried over magnesium sulfate and evaporated to dryness. The crude product was filtered through a pad of flash silica 20 (32-63) and eluted with a 1: 9 mixture of ether / hexane to give 4.23 g (39%) of methyl 6-methyl anthranilate as an oil.

The thus prepared 6-methyl anthranilate (4.23 g, 0.026 mol) was dissolved in 25 ml of acetic acid and the solution was cooled to 0 ° C. Concentrated hydrochloric acid (45 mL) was added to give a brown slurry. To the slurry was added a solution of 1.89 g (0.027 mol) of sodium nitrite in 8 ml of water, dropwise and with stirring, and the resulting orange solution was stirred at 0 ° C for 1 hour, after which it was added *. At 0 ° C, 6 batches of a mixture of 2.18 g (0.013 mol) of copper (2) chloride dihydrate and sulfur dioxide (6.3 g) in 33 ml of acetic acid and 6 ml of water. The dark green solution was stirred at room temperature overnight, after which it was poured into 300 mL of ice water and the separated solid was collected and dried under suction to give 1.11 g of methyl 2-chlorosulfonyl-6-methylbenzoate which was added. immediately into 100 ml of ice-5 cold ammonium hydroxide solution and stirred at room temperature overnight. The solution was acidified to pH 1 by addition of concentrated hydrochloric acid, and the resulting precipitate was collected and air dried to give 729 mg (12%) of 4-methylsaccharin, m.p. 224-226 ° C.

A mixture of 1.0 g (0.005 mol) of 4-methyl precipitate, 0.33 g (0.001 mol) of TBAB and 1.2 g (0.0075 mol) of chloromethylphenylsulfide in 25 ml of toluene was refluxed for ca. After cooling for 16 hours, it was diluted with ethyl acetate and the solution was washed with aqueous bicarbonate solution and water. The organic phase was separated, dried and evaporated to give 0.74 g of 2-phenylthiomethyl-4-methylsaccharin.

The latter (0.74 g, 0.002 mol) was dissolved in 20 ml of MDC and a solution of 0.47 g (0.003 mol) of sulfuryl chloride in MDC was added dropwise over about 2 hours while stirring The mixture was evaporated to dryness. The yellow solid residue was triturated with hexane, filtered off and dried. 25 to give 0.46 g of 2-chloromethyl-4-methylsaccharin as a light yellow solid.

Preparation 2 Using the procedure described above for Preparation 1, 5.0 g (0.029 mol) of 6-chloroanthranilic acid 30 and 2.75 ml (0.044 mol) of iodomethane were reacted in the presence of 4.08 g (0.073 mol) of powdered potassium hydroxide to give 4.22 g (78%) of methyl 6-chloro-anthranilate as an oil.

4-Chloro-saccharin was prepared by the same procedure used to prepare 4-methylsaccharin using 4.22 g (0.023 mol) of methyl 6-chloroanthranilate in 22 mL of acetic acid and 40 mL of concentrated hydrochloric acid and 1, 68 g (0.024 mol) of sodium nitrite in 7 ml of water to make the diazonium salt, which was added to 1.93 g (0.011 mol) of copper (2) chloride dihydrate and 6.5 g of sulfur dioxide in 30 ml of acetic acid and 5 ml. ml of water. Treatment of the resulting methyl 2-chlorosulfonyl-6-chlorobenzoate with 150 ml of ammonium hydroxide solution as described above afforded 3.07 g (62%) of 10 4-chlorosaccharin as a light yellow solid, m.p. 245-246 ° C.

2-Hydroxymethyl-4-chloro-saccharin was prepared by heating a solution of 1.00 g (0.0046 mol) of 4-chloro-saccharin and 3.22 ml of a 37% aqueous solution of formalin in ethanol. All attempts to crystallize a heavy-duty oily product resulted in decomposition of the starting material and were thus used in the next step without characterization.

The crude 2-hydroxymethyl-20 4-chlorosaccharin (609 mg, 0.0025 mol) thus prepared was stirred in 5 ml of diethyl ether and 3 ml of thionyl chloride was added. The resulting mixture was heated to complete dissolution, stirred at room temperature overnight, diluted with 20 mL of ether and filtered through a pad of sand over celite eluting with ether. Removal of the solvent gave 430 mg of the crude chloromethyl derivative. A portion (225 mg) was separated for further reactions. The remainder (205 mg) was subjected to flash chromatography on silica gel eluting with 40% ether / pentane to give 137 mg of 2-chloromethyl-4-chlorosaccharin; mp. 135-136 ° C.

*

Preparation 3ä

To a slurry of 6.0 g (0.03 mol) of copper (I) iodide in 100 ml of THF was added 25 ml of dimethylsulfide 35 and the resulting yellow solution was cooled to -78 ° C and a solution of 23 ml (0.06 mol) of a 3.0 M solution of phenylmagnesium bromide in diethyl ether was added dropwise. The resulting pale yellow-orange solution was stirred at -78 ° C under nitrogen for 1 hour, after which 3.02 g (0.03 mol) of 2-cyclohexenone in 10 ml of THF was added. The resulting mixture was allowed to warm to 0 ° C over 2 hours, after which it was cooled back to -78 ° C and 15 ml of hexamethylphosphoramide were added, stirred for 30 minutes, and 8.0 g (0.09 g) was added thereto. mol) methyl cyanoformate and allowed to warm to ambient temperature overnight. The reaction mixture was poured into 100 ml of 2N hydrochloric acid, the organic phase separated and the aqueous phase back-extracted with MDC. The resulting organic phases were combined and evaporated to dryness in vacuo, followed by trituration of the residue with saturated ammonium chloride solution, then water and then brine, followed by evaporation again to give 3.2 g of methyl 2-phenylcyclohexan-6-one oil carboxylate.

A mixture of the latter (3.0 g, 0.013 mol), 4.8 g (0.039 mol) of benzylmercaptan and 1.0 g of AmberlystR-15 resin (Rohm and Haas) in chloroform was refluxed for 20 hours. after that, an additional 1.5 g of resin was added to the mixture and boiled in VV. 25 for 4 hours. The mixture was then cooled to ambient temperature, filtered, the filtrate evaporated in vacuo, the residue triturated with hexane and the solid collected by filtration to give 0.85 g (19%) of a mixture of methyl 2-benzylthio-6-30 phenylcyclohex-2 -enicarboxylate and methyl 2-benzyl:. ·, Thylthio-6-phenylcyclohex-1-enecarboxylate, of which 0.6 g (0.0018 mol) was heated with 2.0 g of 2,3-dichloro-5,6-dicyanobenzoquinone in 25 ml of toluene sa-I. stirring in nitrogen gas for 24 hours. Mixture 35 was filtered through a pad of silica gel eluting with 2: 1

i mm «M

After evaporation of the eluate, 0.3 g (67%) of methyl 2-benzylthio-6-phenylbenzoate was obtained.

The latter (0.52 g, 0.0016 mol) was dissolved in 5 ml of MDC and diluted with 20 ml of acetic acid and 5 ml of water, after which the mixture was cooled to -10 ° C and bubbled with chlorine gas until the exothermic reaction subsided. The mixture was then stirred for 10 minutes and evaporated to dryness in vacuo to give 0.41 g (85%) of methyl 2-chlorosulfonyl-6-phenylbenzoate, which was dissolved in 10 mL of THF, followed by was added to 25 ml of concentrated ammonium hydroxide solution while cooling in an ice / acetone bath. The reaction mixture was extracted with MDC, the organic phase was separated and discarded, and the aqueous phase was acidified to pH 1 by the addition of concentrated hydrochloric acid and extracted with MDC. The combined organic phases were obtained by washing with brine, drying and evaporation to dryness, 0.33 g (97%) of 4-Fe-20-yl-saccharin.

Following a procedure similar to that described in Preparation 1, the latter (0.33 g, 0.0012 mol) was reacted with 0.3 g (0.0019 mol) of chloromethylphenylsulfide in 15 ml of toluene in the presence of 0. 08 g (0.0025 mol) of TBAB followed by treatment of 2-phenylthiomethyl-4-phenylsaccharin (0.48 g, 100%) with sulfuryl chloride in MDC gave 0.36 g (95%) of 2-chloromethyl- 4-phenylsaccharin.

Preparation 3B

To a slurry of anhydrous CuCN (2.16 g, 0.025 mol) in anhydrous ether (100 mL) was added t-butyllithium (29.0 mL of a 1.7 M solution in pentane) at -78 ° C. 0.05 mol). The reaction mixture was stirred at -78 ° C for 1 hour and then at -45 ° C for 30 minutes, after which it was cooled back to -78 ° C. A solution of cyclohexenone (2.4 g, 0.025 mol) in ether (25 mL) was added and stirring was continued for 15 minutes at -78 ° C and -45 ° C for 30 minutes. The resulting mixture was cooled back to -78 ° C and 5 HMPA (10 mL) in ether (25 mL) was added. After 5 minutes, methyl cyanoformate (2.55 g, 0.03 mol) in ether (25 mL) was added and the reaction mixture was warmed to 0 ° C over 2 hours. The resulting mixture was quenched by the addition of 2N hydrochloric acid (100 mL), the resulting phases were separated and the organic phase was washed with saturated NH 4 Cl solution (3 x 50 mL), water (2 x 50 mL), brine (1 x 50 mL) and dried ( Na2S04). Removal of the solvent in vacuo and purification by Kugelrohr distillation (bath temperature 100-115 ° C, 0.6 mm) afforded 4.7 g of 15 (88%) methyl 2- (1,1-dimethylethyl) cyclohexan-6-one carboxylate.

Cyclohexanone (4.6 g, 0.022 mol) was mixed with benzylmercaptan (2.95 g, 0.024 mol) and acidic clay in montmorillonite-CSF (7.5 g) in anhydrous to-20 toluene (7.5 ml). The mixture was refluxed under nitrogen shielding, azeotropically removing water for 6 hours, cooled to room temperature and left to stand overnight. The solids were filtered off and washed with ether. The filtrate batches were combined and washed with 10% Na 2 CO 3 solution, water, brine and dried. Removal of the solvent in vacuo and purification of the residue by flash chromatography on silica gel (10% ether in hexanes) gave 4.4 g (66%) of a mixture of methyl 2-benzylthio-6- (1,1-dimethylethyl) -30 cyclohex-2-enecarboxylate and 2-Benzylthio-6- (1,1-dimethylethyl) cyclohex-1-enecarboxylate which was mixed with DDQ (17.5 g, 0.077 mol) in toluene (50 ml) for 16 hours. The red reaction mixture was filtered through a 15 cm pad of silica eluting with 6: 3: 1 35 hexane / MDC / ether (1000 mL). The eluates were washed with 33,103,115 of 10% NaOH, water, brine and dried. Removal of the solvent in vacuo and purification of the residue by chromatography on silica gel (5% ether in hexane) provided 1.6 g (40%) of methyl 2-benzyl-5-lithio-6- (1,1-dimethyl) benzoate.

Benzylthiobenzoate (1.3 g, 0.004 mol) was dissolved in MDC (5 mL) and the resulting solution was diluted with acetic acid (25 mL) and water (2 mL), then cooled to -10 ° C and bubbled with Chlorine gas was added until the exothermic reaction subsided. The mixture was then stirred for 10 minutes and evaporated to dryness in vacuo. Purification of the residue by column chromatography on silica gel (1: 1 hexane / MDC) gave 0.8 g (67%) of methyl 2-chlorosulfon-15-yl-6- (1,1-dimethylethylbenzoate) which was dissolved in THF: (5 mL), and the resulting solution was added to concentrated ammonium hydroxide solution (25 mL) while cooling in an ice / acetone bath, The reaction mixture was stirred at room temperature for 16 hours then evaporated in vacuo and acidified to pH 1 with 2N The separated solids were collected by filtration and crystallized from ether to give 0.64 g (95%) of 4- (1,1-dimethylethyl) saccharin, mp 185-187 ° C.

4- (1,1-Dimethylethyl) saccharin (0.025 g, 1.0 mmol) was mixed with chloromethylphenyl sulfide (0.25 g, 1.5 mmol) and tetrabutylammonium bromide (0.2 g, 0.6 mmol) in toluene (25 g). ml) and the mixture was refluxed under nitrogen for 16 hours. The resulting mixture was cooled to room temperature, evaporated to dryness, and the residue was purified by silica gel chromatography (80% MDC / hexane) to give 0.35 g (98%) of 2-phenylthiomethyl-4- (1,1-dimethylethyl) saccharin, sulfuryl chloride (0 Treatment with 25 g, 1.8 mmol) of MDC gave 0.21 g (75%) of 2-chloromethyl-4- (1,1-dimethylethyl) saccharin.

Preparation 4

A mixture of 3.22 g (0.012 mol) of 4-bromo precipitate-5-rine (JP 58/79 034, CA 100 (7773) 1984), 1.63 g (0.015 mol) of potassium t-butoxide, 39 g (0.0012 mol) of TBAB and 3.0 ml (0.022 mol) of chloromethylphenylsulfide in 100 ml of toluene were refluxed under nitrogen for 8 hours, then stirred at ambient temperature for about 16 hours. The reaction mixture was then diluted with ethyl acetate, the organic phase was separated and washed with dilute potassium carbonate solution, water and brine, dried over magnesium sulfate and evaporated in vacuo. The resulting solid was recrystallized from toluene / hexane to give 3.86 g (84%) of 4-bromo-2-phenylthiomethylsaccharin; mp.

174.5-178 ° C.

To a solution of the latter (3.27 g, 0.0085 mol) in 85 ml of MDC was added dropwise and with stirring 1.02 ml (0.0127 mol) of sulfuryl chloride. The mixture was stirred at ambient temperature for 1 h, then evaporated to dryness in vacuo, and the residue triturated with hexane, followed by; Filtration gave 2.61 g of crude product which was recrystallized from toluene / hexane to give 2.24 g (85%) of 2-chloromethyl-4-bromosaccharin; mp. 157-159 ° C.

Preparation 5

To a solution of 8.0 ml (0.053 mol) of tetramethyl-30-ethylenediamine (TMEDA) in 350 ml of THF was added 42 ml (0.055 mol) of a 1.3 M solution of s-butyllithium in cyclohexane at -70 ° C. and the mixture was stirred for 15 minutes. A solution of 10.36 g (0.050 mol) of 2-methoxy-N, N-di-35-ethylbenzamide in 150 ml of THF was added dropwise with stirring while maintaining a temperature of T · ·% 35 103115 -60 ° C: or below. The reaction mixture was stirred for 20 minutes followed by bubbling sulfur dioxide while maintaining the reaction temperature below -50 ° C until the reaction mixture gave an acidic reaction with wet litmus 5 paper. The mixture was stirred at ambient temperature for 2 hours, diluted with 450 mL of hexane, and the separated solid was collected and dissolved in 200 mL of water, followed by treatment with 65 g of sodium acetate and 21.5 g (0, 19 mol) of hyd-10 hydroxylamine-O-sulfonic acid in portions with stirring. The separated white solid was collected and dried to give 7.04 g (49%) of 2-aminosulfonyl-6-methoxy-N, N-diethylbenzamide? mp. 190 - 194.5 ° C.

A mixture of the resulting product (4.3 g, 0.0155 mol) in 75 ml of dioxane and 25 ml of concentrated hydrochloric acid was heated in a steam bath for 70 hours, then cooled, evaporated to dryness in vacuo and diluted with water and ice. and the solution was made strongly basic by the addition of concentrated sodium hydroxide solution. The mixture was washed with MDC and the aqueous phase acidified by the addition of dilute hydrochloric acid followed by extraction with MDC. The resulting extracts were dried over magnesium sulfate and evaporated to give 1.29 g (40%) of 4-me-25 toxic saccharin. An alternative and preferred procedure, cyclization of 2-aminosulfonyl-6-methoxy-N, N-diethylbenzamide to 4-methoxy-saccharin, was carried out under reflux in glacial acetic acid for 6½ hours in a yield of 65%.

Following a procedure similar to that described above for Preparation 4, 1.14 g (0.0053 mol) of the crude product was reacted with 1.31 ml (0.0097 mol) of chloromethylphenylsulfide in toluene in the presence of 0.72 g ( 0.0064 mol) of potassium t-butoxide and 174 35 mg (0.00054 mol) of tetrabutylammonium bromide to give 1.363 g (69%) of 4-methoxy-2-phenylthiomethyl saccharin; mp. 152.5-1544.5 ° C (from ethyl acetate / hexane) whereupon treating 1.02 g (0.003 mol) with 0.36 ml (0.0045 mol) of sulfuryl chloride in MDC gave 282 mg of 5 (36%). 2-chloromethyl-4-methoxy-saccharin; mp. 169-174 ° C.

Preparation 6A

1 To a solution of 4.74 mL (0.031 mol) of tetramer ethyl ethylenediamine in 300 mL of THF (passed through alumina before use) was added 5.8 g (0.03 mol) of 2-ethyl-N, N-diethylbenzamide. The solution was cooled to -78 ° C and 34.9 mL (0.031 mol) of a 0.9 M solution of s-butyllithium in cyclohexane was added. After the addition was complete, the mixture was stirred for 20 minutes and 3.2 ml (0.04 mol) of ethyl iodide solution was added keeping the temperature at -78 ° C. The temperature was then allowed to rise to ambient temperature and the mixture was stirred for about 16 hours and then poured into water. The resulting oil was separated and chromatographed on silica gel eluting with 10% ethyl acetate / hexane to give 2.86 g (43%) of 2-sec-butyl-N, N-diethylbenzamide as a yellow oil.

Following a procedure similar to that described in Preparation 5, the latter (10.45 g, = 0.045 mol) was dissolved in 70 ml of THF and added to a solution of 39.2 ml (0.047 mol) of 1.2M s-butyllithium solution in cyclohexane and 7.1 ml (0.047 mol) of tetramethylethylenediamine in 250 ml of THF while maintaining the temperature at -78 ° C. After the addition was complete, the mixture was stirred for an additional hour at -78 ° C, after which sulfur dioxide was added at -70 ° C and then allowed to warm to room temperature. The mixture was evaporated in vacuo to a residue, the residue was dissolved in water and the solution was added with stirring to a cold solution of 15.2 g (0.134 mol) of hydroxylamine-O-37 103115 sulfonic acid and 15.4 ml (0.134 mol) of 35%: ± sodium hydroxide solution to give 10.1 g (72%) of 2-amino-sulfonyl-6-sec-butyl-N, N-diethyl-benzamide.

The latter (6.83 g, 0.22 mol) was dissolved in 5 100 ml of glacial acetic acid and the solution was refluxed for 13 hours, then evaporated to dryness. The residue was triturated in diethyl ether and collected by filtration to give 5.7 g (83%) of the diethylammonium salt of 4-sec-butylsaccharin.

The latter (3.0 g, 0.0096 mol) was obtained by reaction of 1.13 ml (0.012 mol) of chloromethylphenylsulfide in toluene with 3.47 g (100%) of 2-phenylthiomethyl-4-sec-butylsaccharin. .

Reaction of the latter (3.2 g, 0.0097 mol) with 2.3 ml (0.029 mol) of sulfuryl chloride in 20 ml of MDC gave 2.4 g (87%) of 2-chloromethyl-4 -butyy-lisakkariinia.

Preparation 6B

According to a procedure analogous to that described for Preparation 20 6A, 9.2 g (32.9 mmol) of 3,4-dimethoxy-2-propyl-N, N-diethylbenzamide was reacted with sulfur dioxide and 5.6 g. (49.4 mmol) of hydroxylamine-O-sulfonic acid to give 7.4 g (63%) of 2-aminosulfonyl-4,5-dimethoxy-6-propyl-N, N-di-25-methylbenzamide, which was cyclized in quantitative yield in acetic acid and phenylthiomethylated with 1.42 ml (15 mmol) of chloromethylphenylsulfide to give 4.07 g of 5,6-dimethoxy-2-phenylthiomethyl-4-propylsaccharin. Reaction of 3.59 g (8.8 mmol) of phenyl-thioether with 2.12 mL (26.4 mmol) of sulfuryl chloride gave 2.84 g (97%) of 2-chloromethyl-11,6 dimethoxy-4-propyy1isakkariinia.

3,4-Dimethoxy-2-propyl-N, N-diethyl-benzamide was obtained by the following procedure:

To a solution of 0.216 mol of n-butyllithium in 250 ml of ether was added dropwise 138.2 g (0.216 mol) of veratrol in 100 ml of ether and 32.6 ml (0.216 mol) of TMEDA at ambient temperature. The reaction mixture was stirred at ambient temperature for 14 hours, after which 21.9 ml (0.225 mol) of n-propyl iodide was added with cooling. The reaction mixture was stirred for 1 hour at room temperature then further worked up in 1N aqueous hydrochloric acid to give 14 g (36%) of 2,3-dimethoxybenzenepropane which was brominated using 14.52 g (81.6 mmol) of N-bromosuccinimide. 36 g of silica gel in 400 ml of CCl4 Hisatoshin et al. (Bull.Chem.Soc.Jap. 32, 591-593 (1989)) to give 19.6 g (98%) of 6-bromo-2,3-dimethoxy-15-benzenepropane.

Bromobenzene (14.2 g, 54.8 mmol) was dissolved in 200 mL of ether, the solution was cooled to -78 ° C and 25.2 mL (63 mmol) of a 2.5 N solution of n-butyllithium in hexane was added. The reaction mixture was warmed to 0 ° C where it was held for 1 hour, after which it was cooled to -70 ° C and 9 ml (71.2 mmol) of diethylcarbamyl chloride was added. The reaction mixture was allowed to warm to room temperature and quenched by the addition of saturated ammonium chloride solution. After extraction and drying, crystallization of the product from hexane gave 9.5 g (62%) of 3,4-dimethoxy-2-propyl-N, N-diethylbenzamide; mp. 65-67 ° C.

Preparation 6C

In a procedure analogous to Preparation 6B, 10.75 g (30 mmol) of 6-aminosulfonyl-3,4-dimethoxy-2-30 isopropyl-N, N-diethylbenzamide were cyclized to give 6.43 g of 5,6-dimethoxy-4- isopropyl saccharin (m.p.

186-188 ° C from ether / hexane), of which 5 g (17.5 mmol) of phenylthiomethyl chloride was prepared using 2.48 ml (26.3 mmol) of phenylthiomethyl chloride according to the procedure of Preparation 5, 35 followed by the product with 3 equivalents of sulfuryl chloride. chlorination yielded 85% yield of 2-chloromethyl-5,6-dimethyl-4-isopropyl-saccharin; mp. 117-119 ° C from ethyl acetate / hexane.

The required benzamide was obtained by bromination from 2,3-dimethoxy-α-me-5-yl-benzene-ethane followed by carbamylation as in Preparation 6B to give intermediate 3,4-dimethoxy-2-isopropyl-N, N-diethyl-benzamide. A solution of 66 mL of 0.96 M sec-butyllithium was added to 16.1 g (57.6 mmol) of benzamide in 400 mL of 10 THF at -78 ° C under nitrogen. After stirring for 2 hours, the orange anion was passed through an excess of sulfur dioxide at -60 ° C. The reaction mixture was allowed to warm to room temperature where it was stirred for 18 hours to remove SO 2. 10 ml of sulfu-15-chloride chloride was added at 0 ° C and the reaction mixture was distilled. The sulfonyl chloride was extracted into EtOAc-ether, the extract washed with water, dried and distilled. The residue was dissolved in 80 mL of THF and 17 mL of concentrated NH 4 OH solution was added at 0 ° C. The reaction mixture was stirred briefly at room temperature, distilled and the residue was triturated with 2: 1 ether / hexane to give 12.89 g (62%) of 6-amino-sulfonyl-3,4-dimethoxy-2-isopropyl n, n-dietyylibentsamldia; mp. 138-140 ° C.

Preparation 7. To a solution of 9.3 ml (0.058 mol) of tetramethylethylenediamine in 340 ml of THF was added 52 ml of a 1.1 M solution of s-butyllithium (0.057 mol) in cyclohexane at -78 ° C. A solution of 11.37 g (0.052 mol) of 2-propyl-N, N-diethylbenzamide in 75 ml of THF was then added at -78 ° C, whereupon the solution was stirred for 15 minutes. a solution of 8.3 ml (0.104 mol) of ethyl iodide in THF was added. The solution was stirred for 1½ hours at -78 ° C, then quenched by the dropwise addition of saturated ammonium chloride solution at -78 ° C. The mixture was then allowed to warm to ambient temperature, diluted with diethyl ether, washed first with dilute hydrochloric acid, then with water, then with saturated sodium bicarbonate, brine, dried and evaporated to dryness to give 12.9 g of product. which was chromatographed on silica gel eluting with 10% ethyl acetate / hexane to give 3.23 g (25%) of 2- (3-pentyl) -N, N-diethylbenzamide as a yellow oil.

Following a procedure similar to that described above for Preparation 5, the latter (3.05 g, 0.0115 mol) in THF was reacted with 10.5 ml (0.126 mol) of a 1.2 M solution of s-butyllithium in cyclohexane, in the presence of 2.1 ml (0.014 mol) of tetra-15-methylethylenediamine. The resulting lithium salt was then reacted first with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate to give 1.97 g (52%) of 2-aminosulfonyl-6- (3-pentyl) -α, Ν-diethylbenzamide as pale yellow crystals; mp.

118-120 ° C (softening at 102 ° C), of which 1.84 g (0.0056 mol) was cyclized in 22 ml of refluxed glacial acetic acid to give 1.28 g (70%) of 4- (3- diethylammonium salt of pentyl) saccharin; mp. Mp 107.5-109.5 ° C.

The latter (0.0037 mol) was obtained in reaction 25 which was carried out with 0.74 ml (0.0055 mol) of chloromethylphenylsulfide in the presence of 116 mg (0.0004 mol) of TBAB in 45 ml: of toluene, 1.93 g of 2-phenylthiomethyl-4- (3-pentyl) saccharin as a light yellow oil, from which 1.93 g (0.0037 mol) were obtained in a reaction of 0.59 ml. (0.0073 mol) of sulfuryl chloride in 37 ml of MDC, 1.2 g of 2-chloromethyl-4- (3-pentyl) saccharin as a pale yellow oil.

PREPARATION 8 sec-A solution of 50.0 g (0.27 mol) of 2,4-dimethoxybenzoic acid in 60 ml (98.0 g, 0.82 mol) of thionyl • ·. i. 41 103115 chloride, refluxed for 3 hours, then cooled and the excess thionyl chloride was distilled off. The resulting 2,4-dimethoxybenzoyl chloride was dissolved in 150 mL of MDC and a solution of 68 mL (48 g, 0.66 mol) of diethylamine in 500 mL of MDC cooled to 0 ° C was added. . After the addition was complete, the mixture was stirred at ambient temperature for 15 hours, after which it was washed with saturated sodium bicarbonate solution, water and brine and evaporated to dryness to give 44.78 g (69%) of 2,4-dimethoxy-N, N- dletyylibentsamidia; tr. 155-163 ° C / 0.4 mm.

Following a procedure similar to that described for Preparation 5 above, 10.0 g (0.042 mol) of product in 250 ml of THF was reacted with 40.57 ml of a 1.1 M solution of s-butyllithium (0.044 mol) in cyclohexane. and 6.35 ml (0.042 mol) of tetramethylethylenediamine in THF. The resulting lithium salt was then reacted first with about 40 mL of sulfur dioxide and then with an aqueous solution of sodium hydroxylamine-O-sulfonate (0.13 mol) to give 8.26 g of 2-aminosulfonyl-4,6-dimethoxy-N, N-diethylbenzamide, of which 7.0 g (0.022 mol) was cyclized in 80 ml reflux. While cooling with boiled glacial acetic acid to give 6.6 g (94%) of the diethylammonium salt of 4,6-dimethoxysaccharine which was used directly in the next step without purification.

The latter (6.0 g, 0.019 mol) was obtained in 30 reactions carried out with 3.82 ml (0.028 mol) of chloromethylphenylsulfide in the presence of 0.611 g (0.0019 mol) 200 in 200 ml: of toluene, 6.2 g (89%) of 2-phenylthiomethyl-4,6-dimethoxysaccharin, of which 5.82 g (0.016 mol) were obtained in the reaction which was carried out in 3.23 g (0.0019 mol). with sulfuryl chloride in 100 mL • · 42 103115 MDC, 4.63 g (100%) of 2-chloromethyl-4,6-dimethoxy-saccharin; mp. 185-187 ° C.

Preparation 9A - 9G

Following a procedure similar to that described in Preparation 5 above, substituting the appropriate 2-R4-R5-substituted-N, N-diethylbenzamide for 2-methoxy-N, N-diethylbenzamide, the following 2-halo-namethyl listed in Table A were prepared: -4-R4-R5-saccharines via the corresponding 2-phenylthiome-10-style saccharines. When available, the melting point, recrystallization solvent, and yield are reported for each of the 2-unsubstituted saccharin, 2-phenylthiomethylsaccharin, and 2-chloromethylsaccharin in the columns labeled "sp./solvent" and 15 "yield." In all cases, intermediate-2-phenylthiomethyl-saccharines were used directly in the next step without further characterization or purification.

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Preparation 10

Following a procedure similar to that described in Preparation 2, 18.3 g (0.1 mol) of saccharin were reacted with 70 ml of a 37% formalin solution in ethanol to give 3.58 g (70%) of 2-hydroxymethyl saccharin . The latter (25 g, 0.117 mol) was reacted with 63.3 g (0.234 mol) of phosphorus tribromide in diethyl ether to give 29.8 g (92%) of 2-bromomethyl-saccharin; mp. 155-157 ° C.

Preparation

To a solution of 4 g (0.0175 mol) of 6-nitrosaccharin in 240 ml of ethanol was added 4.4 g (0.0175 mol) of thallium ethoxide, and the mixture was allowed to stand at room temperature for 1 hour, after which it was cooled. for about 16 hours and the precipitated solid was collected and dried to give 7.6 g (100%) of the thallium salt of 6-nitrosaccharin. The product was slurried in 50 mL of DMF and 3.07 g (0.0194 mol) of chloromethylphenylsulfide was added, followed by warming to about 63 ° C for 5 hours, standing at ambient temperature for about 16 hours and it was then poured into ice water. The crude product obtained by filtration was stirred in MDC and the solution filtered to remove the thallium salts. The filtrate was freed from the solvent and the resulting pale yellow solid was sonicated in warm ethanol, followed by recovery and drying to give 4.6 g (75%) of 6-nitro-2-phenylthiomethyl saccharin; mp. 161-163 ° C. The latter was obtained by reaction with sulfuryl chloride 30 in MDC using 3.7 g of 2-chloromethyl-6-nitrosaccharin according to the procedure described above for Preparation 4.

PREPARATION 12

A solution of 49.8 g (0.199 mol) of 2-hydroxy-5-35 (1,1,3,3-tetramethylbutyl) benzoic acid in 200 ml of methanol was heated to 50 ° C. followed by the dropwise addition of about 80 g of sulfuric acid at a rate at which the reaction boiled steadily. The reaction mixture was refluxed for a further 11 hours, after which it was cooled and partitioned between water and ethyl acetate.

The organic phase was separated and washed with saturated sodium bicarbonate solution, then water, dried over sodium sulfate and evaporated to dryness to give 48.6 g (92%) of methyl 2-hydroxy-5- (1,1,3,3-tetrame-10). tyylibutyyli) benzoate.

The latter was dissolved in 250 ml of DMF and 40.4 g (0.36 mol) of 1,4-diazabicyclo [2.2.2] octane was added, followed by 33.4 g (0.27 mol) of N. , N-di-methylchlorothiocarbamate and 100 ml DMF. The reaction mixture was heated at 45 ° C for about 8 hours, cooled, poured into ice water and concentrated hydrochloric acid, followed by extraction with ethyl acetate. The combined organic phases were washed with dilute hydrochloric acid, then with sodium bicarbonate solution and then with brine, dried and evaporated to give 48.2 g (76%) of methyl 2- (N, N-dimethylthiocarbamyloxy) -5- (1, 1,3,3-Tetramethylbutyl) benzoate, which was heated at 220 ° C for 15 hours, which was then cooled, dissolved in toluene and chromatographed on silica gel, eluting with 1: 9 ethyl acetate / toluene, gave 3.6 g (14%) of methyl 2- (N, N-dimethylcarbamylthio) -5- (1,1,3,3-tetramethylbutyl) benzoate.

To a solution of the latter (0.025 mol) in 40 ml of MDC was added with stirring 80 ml of glacial acetic acid and then 16 ml of water. The reaction mixture was cooled to 0 ° C and bubbled with chlorine gas for about 5 minutes while maintaining the temperature at 5-24 ° C. The reaction mixture was stirred for an additional 30 minutes, evaporated to dryness in vacuo and the remaining solution was poured into ice water. Extraction of the mixture with ethyl acetate and isolation of the product from the combined organic phases afforded 6.8 g (78%) of methyl 2-chlorosulfonyl-5- (1,1,3,3-tetramethyl-butyl) -benzoate.

The product (9.0 g, 0.026 mol) was dissolved in THF and the solution was added to 100 ml of concentrated ammonium hydroxide solution while cooling in an ice bath. The resulting solution was stirred for about 16 hours, after which it was concentrated in vacuo and the concentrated solution was acidified. 10 to pH 3 by the addition of concentrated hydrochloric acid.

The mixture was stirred for several hours, after which time the separated solid was collected, washed with water and dried to give 9.0 g of 5- (1,3,3-tetramethyl-butyl) saccharin; mp. 213-215 ° C.

Following a procedure similar to that described in Preparation 11, 9.0 g (0.30 mol) of the product was reacted with thallium ethoxide in ethanol and the resulting thallium salt was reacted with 3.33 g (0.021 mol) of chloromethylphenyl sulfide in DMF to give 5.76 g (66%) of 2-phenylthiomethyl-5- (1,1,3,3-tetramethyl-butyl-saccharin) of which 3.3 g (0.007 mol) ^ 0.944 g of sulfuryl chloride in MDC were treated with 1 g (41%) of 2-chloromethyl-5- (1,1,3,3-tetramethyl-butyl) saccharin.

Preparation 13

Following a procedure similar to that described above for Preparation 12, 15.5 g (0.086 mol) of ethyl 2-hydroxy-6-methylbenzoate was reacted with 15.9 g (0.129 mol) of Ν, Ν-dimethylchlorothiocarbamate in the presence of 19.3 g (0.172 mol) of 1,4-diazabicyclo [2.2.2] octane in DMF gave 22.1 g (96%) of ethyl 2- (N, N-dimethylthiocarbamyloxy) -6-methylbenzoate, m.p. was heated at 220 ° C for about 10 hours. The product was purified by chromatography on silica gel in MDC,

1 «R-fTI

• · 47 1 03115

Ethyl 2- (N, N-dimethylcarbamylthio) -6-methylbenzoate was obtained as a tan oil.

To a solution of the latter (22.6 g, 0.0844 mol) in 170 ml of MDC was added 340 ml of glacial acetic acid 5 and 68 ml of water while cooling in an ice / acetone bath, and chlorine gas was bubbled into the reaction mixture for 10-15 minutes. I drive. The reaction vessel was evacuated to remove excess chlorine gas and MDC, and the mixture was poured into water and partitioned between MDC and water. From the organic phase-10, 19 g of ethyl 2-chlorosulfonyl-6-methylbenzoate were obtained by drying and evaporation to dryness, of which 5 g (0.019 mol) was reacted with concentrated ammonium hydroxide solution in THF to give 6.1 g (67%). 4-methylsaccharin.

Following a procedure similar to that described in Preparation 11 above, the product (10.1 g, 0.0512 mol) was converted to the thallium salt by reacting with 12.8 g (0.0512 mol) of thallium ethoxide in ethanol, followed by reacting the thallium salt with 6.7 g (0.0427 20 mol) of chloromethylphenyl sulfide in DMF to give 6.85 g (50%) of 2-phenylthiomethyl-4-methylsaccharin.

Reaction of the latter (6.7 g, 0.021 mol) with sulfuryl chloride in MDC afforded 4.9 g (95%) of 2-chloromethyl-4-methylsaccharin.

Preparation 14A

A mixture of 75 g (0.36 mol) of 3,3-dithiobispropionic acid, 102 ml of thionyl chloride and a catalytic amount of pyridine was stirred for about 24 hours and then evaporated to dryness in vacuo. To the residue was added MDC and evaporated again to dryness to remove the thionyl chloride and pyridine residue to give 87 g (98%) of the corresponding bis acid chloride, of which 44.8 g (0.18 mol) was dissolved in THF and the solution was added dropwise to a solution of 77.16 g (0.72 mol) of benzyl • 48 103115 amines in THF. After stirring for 2 hours at 40 -45 ° C, the mixture was cooled and the precipitated solid was collected, washed with water and dried to give 59 g (84%) of 3,3-dithiobispropionic acid-5 ρ, ο '. -dibentsyylikarboksamidia? mp. 162-165 ° C.

Reaction of 7.0 g (0.018 mol) of the latter with 10.25 g (0.076 mol) of sulfuryl chloride in MDC gave a mixture of 2-benzyl-2H-isothiazol-3-one and 5-chloro- 2-benzyl-2H-isothiazol-3-one, which were largely separated by ultrasonic treatment in MDC (which gave most of the former to a soluble form). The insoluble material was collected by filtration and chromatographed on silica gel, eluting with MDC. There was thus obtained 5-chloro-2-benzyl-2H-isothiazol-3-one; mp.

58-68 ° C.

A solution of 10 g (0.044 mol) of the latter in MDC was cooled to 0 ° C and 7.6 g (0.044 mol) of 3-chloroperbenzoic acid were added and the mixture was stirred for 10 minutes, followed by addition of another 7.6 g portion of perbenzoic acid. The reaction mixture was filtered, the filter washed with MDC, and the filtrate washed with saturated sodium bicarbonate solution, then brine, dried over sodium sulfate and evaporated to dryness, followed by chromatography on silica gel eluting with 50: 50 product / h. to give 7.15 g (46%) of 5-chloro-2-benzyl-2H-isothiazol-3-one 1-oxide.

To a solution of 1.1 g (0.0045 mol) of the latter 30 in 8 ml of benzene was added 0.55 g (0.0051 * mol) of 2-methoxifuran and the solution was heated in a pressure bottle at 70 ° C: at room temperature for 1.5 hours, after which it was cooled and the solid was collected, washed with benzene and dried to give 2-benzyl-7-hydroxy-4,4-methoxy-benzisothiazol-3-one-1-one. oxide; mp. 235-237 ° C.

A mixture of the product (1.85 g, 0.006 mol), 2.48 g (0.018 mol) of potassium carbonate and 1.70 g (0.0125 mol) of methyl iodide in acetone was refluxed for 1.5 hours, followed by was cooled and poured into water. The separated solid was collected by filtration, washed with water and dried to give 1.70 g (89%) of 2-benzyl-4,7-dimethoxybenziso-10-thiazol-3-one 1-oxide, of which 1.13 g (0 (0035 mol) was oxidized with 1.20 g (0.007 mol) of 3-chloroperbenzoic acid in MDC using the procedure described above to give 1.03 g (88%) of 2-benzyl-4,7-dimethoxysaccharin.

A mixture of 2.07 g (0.0062 mol) of product, 1.37 g (0.02 mol) of ammonium formate and 1.5 g of catalyst in 10% palladium on carbon in 80 ml of methanol was refluxed for 1 hour. then cooled and filtered, and the filtrate was evaporated to dryness to give 0.92 g (57%) of the ammonium salt of 4,7-dimethoxy-ssac-carrine.

A solution of 1.11 g (0.0042 mol) of the ammonium salt was dissolved in DMF, 0.67 g (0.0042 mol) of chloromethylphenylsulfide was added and the solution was refluxed for 8 hours, then cooled. -25 was poured into ice water. The separated solid was collected, washed with water and dried to give 0.50 g (33%) of 2-phenylthiomethyl-4,7-dimethoxy-saccharin.

By reacting the latter (0.5 g, 0.0013 mol) with sulfuryl chloride in MDC. The procedure described in Preparation 4 above gave 0.22 g (58%) of 2-chloromethyl-4,7-dimethoxy-saccharin.

Preparations 14B and 14C

Following a procedure similar to that described in Preparation 35A, other 2-chloromethyl saccharin derivatives were prepared as follows:

Preparation 14B

Reaction of 5.8 g (0.024 mol) of 5-chloro-2-benzyl-2H-isothiazol-3-one 1-oxide with 3.76 g (0.0335 mol) of 2-ethoxifuran gave 3.05 g. (40%) 2-Benz-5-yl-4-ethoxy-7-hydroxybenzisothiazol-3-one 1-oxide, of which 5.7 g was reacted with 3.6 g (0.197 mol) of 2- [2- methoxyethoxy] ethyl bromide in the presence of 4.95 g (0.0358 mol) of potassium carbonate in 125 ml of methyl ethyl ketone and 25 ml of DMF to give 7.0 g of 10 (93%) of 2-benzyl- 4-ethoxy-7- [2- (2-methoxyethoxy) ethoxy] benzisothiazol-3-one 1-oxide, which was oxidized as above using 3-chloroperbenzoic acid in MDC to give 2-benzyl-4-ethoxy-7 - [2- (2-methoxyethoxy) etok-si] saccharin. Debenzylation of 6.6 g (0.015 mol) of the latter 3.34 g (0.053 mol) of ammonium formate in the presence of 6.4 g of catalyst with 10% palladium on carbon gave 4-ethoxy-7- [2- The (2-methoxyethoxy) ethoxy] saccharin ammonium salt was reacted with 2.38 g (0.015 mol) of chloromethylphenylsulfide 20 in 100 mL of DMF to give 1.46 g (21%) of 2-phenylthiomethyl-4 -ethoxy-7- [2- (2-methoxyethoxy) ethoxy] saccharin; mp. 73-75 ° C (from isopropanol). Treatment of 1.4 g (0.0029 mol) of the product with 0.4 g (0.0029 mol) of sulfuryl chloride in MDC gave 1.16 g (100%) of 2-chloromethyl-4-ethoxy-7- [2- (2-methoxyethoxy) ethoxy] saccharin.

Preparation 14C

3.03 g (0.01 mol) of 2-benzyl-7-hydroxy-4-methoxy-benzisothiazol-3-one 1-oxide (Preparation 14A) were reacted with 2.01 g (0.011 mol) of 2 - (2-methoxyethoxy) ethyl bromide in methyl ethyl ketone in the presence of 2 g (0.015 mol) of potassium carbonate to give 2.58 g (64%) of 2-benzyl-4-methoxy-7- [2- (2-methoxyethoxy) ) ethoxy] benzisothiazol-3-one 1-oxide to oxidize 35 1.1 g (0.0063 mol) of 3-chloroperbenzoic acid in MDC 51 103115 to give 2-benzyl-4-methoxy-7- [ 2- (2-Methoxyethoxy-ethoxy] -accharide: 0.25 g (0.0006 mol) of the product was debenzylated with 0.13 g (0.0021 mol) of ammonium formate in methanol in the presence of 0.25 g of catalyst. % palladium-5 on carbon to give 0.21 g (100%) of the ammonium salt of 4-methoxy-7- [2- (2-methoxyethoxy) ethoxy] saccharin.

Reaction of 1.4 g (0.004 mol) of the ammonium salt with 0.63 g (0.004 mol) of chloromethylphenylsulfide in DMF gave 2-phenylthiomethyl-4-methoxy-7- [2- (2-methoxyethoxy) ethoxy]. saccharin, which, by reaction with sulfuryl chloride in MDC, gave 0.53 g (35%) of 2-chloromethyl-4-methoxy-7- [2- (2-methoxyethoxy) ethoxy] saccharin.

Preparation 15 A solution of 1.89 g (0.011 mol) of diethylamino sulfur trifluoride (DAST) in 20 ml of MDC was added to a slurry of 2.13 g (0.01 mol) of 2-hydroxymethyl saccharin. in MDC while maintaining the temperature of the reaction mixture at -78 ° C.

The reaction mixture was stirred at -78 ° C for 1 hour, then allowed to slowly rise to ambient temperature and stirred for 16 hours, then poured into ice water. The organic phase was separated and washed with water, dried over magnesium sulfate and evaporated to dryness to give 2.2 g of product which was recrystallized from ethyl acetate to give 1.6 g (74%) of 2-fluoromethyl-saccharin; mp. 96-98 ° C.

Preparation 16A

To a solution of 0.5 g (0.0025 mol) of 4-methyl saccharin in THF cooled to -78 ° C in a dry ice / acetone bath was added dropwise and the same. with stirring, a solution of 5.2 ml of a 1.3 M solution of s-butyllithium in cyclohexane. The mixture was stirred for an additional 35 hours at -78 ° C, after which 52,103,115 0.16 ml (0.025 mol) of methyl iodide was added over a period of 1%. After stirring for 1/3/4 hours, the reaction was quenched by the addition of 25 mL of 1N hydrochloric acid, the reaction mixture was basified, the aqueous mixture was extracted with chloroform and then acidified and extracted with ethyl acetate. The organic phases were combined and washed with 10% sodium thiosulfate solution, then brine, dried over sodium sulfate and evaporated to dryness to give a product which, in nmr-10 spectrum, was a mixture of 74% 4-ethylsaccharin and 21% 4,7-dimethylsaccharin.

Following a procedure similar to that described above for Preparation 4, the crude material (0.47 g, 0.0022 mol) was reacted with 0.24 ml (0.0028 mol) of chloromethylphenylsulfide in toluene in the presence of tetrabutylammonium bromide, followed by chromatography on the product. run on silica gel eluting with MDC and collecting 5 ml fractions. The first 420 ml of eluate was discarded. From the next 20 fractions, 0.07 g of the material, which was predominantly 2-phenylthiomethyl-4,7-dimethylsaccharin, were separated by evaporation. The following 25 fractions gave 0.37 g of 2-phenylthiomethyl-4-ethylsaccharin, which was reacted with sulfuryl chloride; 25 in MDC to give 0.19 g (66%) of 2-chloromethyl-4-ethylsaccharin.

Preparation 16B

Following a procedure similar to that described in Preparation 16 to 10 g (0.051 mol) of 4-methylsaccharin in 30 THF was reacted with 86 ml (0.10 mol) of a 1.18 M solution of s-butyllithium in cyclohexane and 4.5 ml was added to the resulting solution. (0.050 mol) of ethyl iodide to give 10.15 g (89%) of 4-propylsaccharin, which was reacted with 5.32 ml (0.056 mol) of 35 chloromethylphenylsulfide in toluene in the presence of tetrabutylammonium 53 103115, was isolated by flash chromatography on silica gel with 2-phenylthiomethyl-4-propylsaccharin as an oil, from which 1.8 g (0.0052 mol) was reacted with 1.25 ml (0.016 mol) 5 of sulfuryl chloride in MDC to give 0.94 g (66%) 2-chloromethyl-4-propylsaccharin.

Preparation 16C

The following is a preferred alternative to Preparation 16A: 10 To a solution of 5.13 g (25 mmol) of N, N, 2, triethylbenzamide in THF (50 mL) was added LDA solution (Aldrich) at -78 ° C. , 2.0 M, 15.63 mL, 31.25 mmol). The solution was warmed to -10 ° C with ice water for 1 hour, then cooled to -78 ° C with dry ice / acetone-15. TMSCl (6.34 mL, 50 mmol) was added as such at -78 ° C, after which the reaction mixture was warmed to room temperature after 1 hour. The reaction was quenched by the addition of saturated NH 4 Cl solution and the reaction mixture was extracted with ether (2 x 100 mL), the resulting extract dried over MgSO 4, distilled and the residue distilled by Kugelrohr (130-140 ° C, 0.65 mm). 51 g (94%) of N, N-diethyl-2- [1- (trimethylsilyl) ethyl] benzamide.

To a mixture of sec-BuLi solution (0.97 M, 5.10 mL, 4.96 mmol) and TMEDA solution (0.75 mL, 4.96 mmol) in THF was added -78 ° C. of amide (1.25 g, 4.50 mmol) in THF. At -78 ° C, excess SO 2 in THF was added quickly, after which the mixture was warmed to room temperature. THF was removed in vacuo and the residue was hand-packed at 0 ° C with two equivalents of a 1: 1 solution of sodium hydroxide (0.36 g, 9.0 mmol) and hydroxylamine-O-sulfonic acid (1.0 g, 9.0 mmol) in water. The reaction mixture was stirred at room temperature for 4 hours, then extracted with EtOAc, dried over MgSO4, evaporated to dryness and flash chromatographed on silica gel eluting with 20% ethyl acetate / hexane to give 0.62 g. (41%) 2-aminosulfonyl-N, N-diethyl-6- [1- (trimethylsilyl) ethyl] benzamide. Benzamide (0.95 g, 2.66 mol) was refluxed in glacial acetic acid (20 mL) for 18 hours, then distilled to dryness, triturated with hot cyclohexane (30 mL) and a small amount of EtOAc (3 mL), and the solution cooled by scraping and filtered. 0.81 g (85%) of 4- [1- (trimethyl-10silyl) ethyl] saccharin was obtained; mp. 123-125 ° C.

To the trimethylsilylethyl saccharin (0.25 g, 0.70 mmol) in DMF (9 mL) was added water (1 mL) and cesium fluoride (0.75 g, 4.94 mmol, 7 equivalents) at room temperature. After 7 hours, the reaction mixture was poured into 5% NaOH and extracted with EtOAc. The aqueous phase was acidified by the addition of 12 N hydrochloric acid and extracted with Et 2 O / EtOAc (1: 1), the resulting extract dried over Na 2 SO 4, filtered and distilled to give a colorless solid in quantitative yield. It was recrystallized from 5% Et 2 O / hexane to give 0.091 g (64%) of 4-ethylsaccharin; mp. 183-185 ° C.

Preparation 17 A 0.07 g aliquot of material obtained from the early fractions by chromatographic separation described above in Preparation 16A, consisting essentially of: 2-phenylthiomethyl-4,7-dimethylsaccharin was reacted with 0.05 ml. sulfuryl chloride in MDC and the product was recrystallized from cyclohexane / ethyl acetate to give 20 mg (51%) of 2-chloromethyl-4,7-30 dimethylsaccharin; mp. Mp 107-108 ° C.

; * Preparation 18A

To a solution of 40.0 g (0.174 mol) of 2-isopropyl-4-methoxybromobenzene in 600 ml of diethyl ether was added 103.68 ml (0.175 mol) of butyl lithium 1.69 at 0 ° C. M solution in diethyl ether. After the addition was complete, the solution was cooled to 0 ° C for 1 hour, then stirred for a further 5 hours at ambient temperature, then cooled to -78 ° C and a solution of 23.68 g (0.175 g) was added. mol) 5 Ν, Ν-diethylcarbamyl chloride in 80 ml diethyl ether. The resulting solution was stirred for about 12 hours while allowing the reaction temperature to rise, after which time the reaction was quenched by the addition of saturated ammonium chloride solution. The aqueous phase and the organic phase were separated, the aqueous 10 siphase was back-extracted with ethyl acetate and the combined organic phases were washed once with brine, then dried and the solution evaporated to give a crude product which was flash chromatographed on silica gel eluting with 30% ethyl acetate. to give 34.4 g (79%) of 2-isopropyl-4-methoxy-N, N-diethylbenzamide as an oil which was used directly in the next step without further purification. the oil may, if desired, be distilled and boil at 123-129 ° C / 0.2-0.3 mm.

Following a procedure similar to that described above for Preparation 5, the latter (15.0 g, 0.060 mol) in 100 ml of diethyl ether was reacted with 77.8 ml (0.784 mol) of a 1.2 M solution of s-butyllithium in cyclohexane in the presence of 6 , 98 g (0.06 mol) · 25 tetramethylethylenediamine. The resulting lithium salt was then reacted first with 50 mL of sulfur dioxide and then with 0.181 mol of sodium hydroxylamine-O-sulfonate to give 11.6 g (59%) of 2-amino-sulfonyl-6-isopropyl-4-methoxy- N, N-diethylbenzamide-30 dia; mp. 103-105 ° C (from ethyl acetate / hexane). 11 g '(0.034 mol) of benzamide was cyclized in 200 ml of refluxed glacial acetic acid to give 10.3 g of 4-isopropyl-6-methoxy-saccharin diethylammonium salt; mp. 132-135 ° C.

103115 56

The latter (0.030 mol) was reacted with 6.14 ml (7.25 g, 0.046 mol) of chloromethylphenylsulfide in the presence of 0.98 g (0.003 mol) of TBAB in 250 ml of toluene 10.1 g (88%) of 2-phenylthiomethyl-5,4-isopropyl-6-methoxy-saccharin as an oil, of which 9.7 g (0.026 mol) was reacted with 3.1 ml (5.21 g, 0.039 mol) of sulfuryl chloride in MDC to give 6.9 g (88%) of 2-chloromethyl-4-isopropyl-6-methoxy-saccharin; mp. 151-152 ° C.

Preparation 18B

An alternative procedure was also followed: To a solution of 300 ml of N, N, N ', N'-tetramethyl-ethylenediamine (TMEDA) (1.99 mol) in 4 liters of anhydrous ether was added 1550 ml of sec-BuLi solution (1, 3 M) and the system was cooled to -70 ° C under nitrogen. A solution of 454.2 g of 2-isopropyl-4-methoxy-N, N-diethylbenzamide (1.82 mol) in 300 ml of anhydrous ether was added dropwise over 30 minutes (the temperature was maintained at -60 ° C during the addition). At or below C). After the addition was complete, the reaction mixture was stirred at -70 ° C for 1 hour, then allowed to warm to -50 ° C. The temperature was maintained at -50 ° C for 30 minutes, after which the mixture was cooled back to -70 ° C. To this stirred solution was added, through a · 25 cannula, a solution of 200 g of SO 2 in 200 ml of dry ether and pre-cooled to -40 ° C under nitrogen pressure for 20 minutes. During the addition, the temperature of the reaction mixture was kept below -40 ° C. (The white powdery precipitate, consisting of aryl lithium sulfinate, almost immediately separated). After the addition was complete, the ice bath was removed and the mixture was allowed to react at ambient temperature for 2 hours. It was cooled to -5 ° C and 190 ml of sulfuryl chloride (2.36 mol) was added dropwise to this stirred solution over a period of 15 minutes at-35, keeping the temperature below 10 ° C during the addition.

I '57 103115

After further stirring for 30 minutes at 0-5 ° C, the white insoluble precipitate was filtered off and washed with 2 liters of anhydrous ether. Removal of the solvent at atmospheric pressure gave the sulfonyl chloride 5 as an impure dark oil. This crude sulfonyl chloride was dissolved in 1.4 L of THF, cooled to -10 ° C, and 540 ml of concentrated NH 4 OH solution (28% solution) was added in portions over 15 minutes (maintained at or below 15 ° C). in the middle of Appendix 10). After stirring for 15 minutes at ambient temperature, the THF and excess ammonia were removed in vacuo to give a dark oil which was diluted with 6.0 liters of water and acidified by the addition of 3N hydrochloric acid to pH 1. The Va-15 lime yellow solid was taken by filtration and washed with 800 mL of water. The solid was dried at 60 ° C under vacuum for 18 hours, then recrystallized from a mixture of 800 mL of ethyl acetate and 3 L of hexane to give 429 g (72%) of 2-amino-20-sulfonyl-6-isopropyl-4 -methoxy-N, N-diethylbenzamide; mp. 122-125 ° C.

A solution of 429.6 g of diethylbenzamide (1.31 mol) in 1.5 liters of acetic acid was refluxed for 20 hours. It was cooled to room temperature; 25 volumes and the solvent was removed in vacuo, the oily residue was dissolved in 6 liters of water and the pH of the solution was adjusted to 1 by addition of 6N hydrochloric acid. The crude product was collected by filtration and washed with 2 liters of water. The solid was dried at 60 ° C under vacuum for 18 hours, after which recrystallization from ethyl acetate / hexane gave 303 g (91%) of 4-isopropyl-6-methoxy-saccharin; mp. 188 ° C.

To a slurry of 24 g of paraformaldehyde (0.8 mol) and 86.4 g of chlorotrimethylsilane (1.6 mol) in 35 200 ml of 1,2-dichloroethane was added 0.8 ml of anhydrous 58 103115 tin (4) chloride and the resulting solution was stirred on a steam bath for 1 hour. After this time, 51 g of 4-isopropyl-6-methoxy-saccharin (0.2 mol) was added to the clear solution, and the reaction mixture was refluxed for 18 hours. It was cooled to room temperature, poured into water, and the organic phase was washed with 50 ml of a 2N sodium hydroxide solution. The organic phase was dried over anhydrous magnesium sulfate and evaporated in vacuo to give a crude product which was purified by crystallization from ethyl acetate / hexane to give 57 g (87%) of 2-chloromethyl-4-isopropyl-6-methoxy-saccharin, m.p.

151 ° C.

Preparation 19 To a solution of 1.0 g (0.0039 mol) of 4-isopropyl-6-methoxysaccharin in 15 ml of MDC was added 1.28 g (5.12 ml) of 1M boron tribromide at ambient temperature. solution in MDC. After the addition was complete, the reaction mixture was refluxed for about 5 hours, cooled and evaporated in vacuo to dryness, followed by addition of ice and saturated sodium bicarbonate solution. The aqueous solution was extracted once with ethyl acetate, then acidified to pH 1 by addition of concentrated hydrochloric acid. Extraction of the mixture with ethyl acetate / diethyl ether (8: 2), evaporation of the organic phases and evaporation of the solvent in vacuo gave 0.9 g (96%) of 6-hydroxy-4-iso-propylsaccharin as a white crystalline solid which was used as a white solid. as such in the next step.

30 An alternative procedure was also used.

To a stirred slurry of 62.74 g (0.47 mol) of AlCl 3 in 500 ml of chloroform was added 43.9 g (0.7 mol) of ethanethiol at 0 ° C. Within minutes, a clear solution formed. To this solution was added 20.0 g (0.078 mol) of 35 4-isopropyl-6-methoxy-saccharin in 550 ml of chloroform 59 103115 over 30 minutes. This solution was allowed to warm to room temperature and stirred for 3 to 4 hours at 60 ° C. After cooling, the mixture was poured into ice water and acidified by the addition of dilute hydrochloric acid.

The separated solid was collected by filtration, washed with water and dried to give 18.4 g (97%) of 6-hydroxy-4-isopropyl saccharin.

Following the procedure described above for Preparation 4, the latter (0.004 mol) was reacted with 0.61 ml (0.0046 mol) of chloromethylphenylsulfide in toluene in the presence of 0.133 g (0.004 mol) of TBAB to give 0. , 32 g (21%) of 4-isopropyl-6-hydroxy-2-phenylthiomethyl-saccharin; mp. 127-129.5 ° C, of which 1.78 g of 0.43 ml (0.73 g) of sulfuryl-15-chloride in MDC gave 1.2 g (84%) of 2-chloromethyl-4-isopropyl 6-hydroxysaccharin; mp. 149-150 ° C.

PREPARATION 22 5 g (0.0207 mol) of 6-hydroxy-4-isopropyl saccharin-20 were dissolved in 150 ml of methanol and 3.4 g (0.0104 mol) of Cs 2 CO 3 was added to the solution. The mixture was stirred for 3-4 hours at room temperature. Excess methanol was removed under reduced pressure and the residue was dried under high vacuum for 2 hours. The residue was then dissolved in 110 · 25 ml DMF and 0.32 g (0.0209 mol) of chloromethylphenyl sulfide was added to the solution. The stirred mixture was heated at 70-75 ° C for 12 hours, cooled and added with ice water, and extracted with 600 mL of 4: 1 ethyl acetate / ether. The organic phase was separated and washed with water and saturated NaCl solution and dried. The solvent was removed under reduced pressure. The residue was purified by flash chromatography eluting with 20% ether / MDC. 4.5 g (60%) of 4-isopropyl-6-hydroxy-2-phenylthiomethyl-saccharin were obtained; mp. 150 35 151.5 ° C, which was reacted with sulfuryl chloride 60 103115 as described in Preparation 19 to give 2-chloromethyl-4-isopropyl-6-hydroxysaccharin as above.

Preparation 23 To a solution of 5-chloro-2-benzyl-4-isothiazolin-3-one (J.Het.Chem. 8, 571 (1971)) (9.4 g, 0.04 mol) in MDC: (100 mL), 80 -85% 3-chloroperoxybenzoic acid (10.8 g, 0.06 mol) was added in one portion and the resulting mixture was stirred at room temperature overnight in 10 nitrogen gas. The precipitated solids were filtered off and washed with MDC (50 mL). The batches of filtrate were combined and evaporated to near dryness, after which the residue was partitioned between ethyl acetate (300 mL) and saturated NaHCO 3 solution (100 mL). The resulting phases were separated and the organic phase was washed with saturated

NaHCO 3 solution (2 x 100 mL), brine (1 x 100 mL) and dried. Removal of the solvent in vacuo gave 10.0 g (99%) of 5-chloro-2-benzyl-4-isothiazolin-3 (2H) -one-1-oxide as a pale yellow oil.

To a solution of 1-oxide (10.0 g, 0.04 mol) in glacial acetic acid (200 ml) was added 30% hydrogen peroxide solution (100 ml, 0.88 mol) and the mixture was heated in a steam evaporator For 2 hours, during which time another 30 ml (0.26 mol) of a 30% hydrogen peroxide solution was added. The reaction mixture was heated in a steam bath for an additional hour, after which it was cooled to room temperature and poured into ice-cold water (1 liter) and stirred. The precipitated solids were collected by filtration, washed with water (2 x 100 mL), hexane and dried in air to give 4.8 g (45%) of 5-chloro-2-benzyl-4-isothiazoline-3 (2H). -one-1,1-dioxide as a colorless solid.

Dioxide (1.2 g, 4.7 mmol) was stirred in 2.02 g (11 mmol) of 2-trimethylsiloxy-5-methylhex-1,3-diene 35 (prepared from 5-methylhex-3-ene according to EJ Corey et al. 61 103115 et al., Tetrahedron Lett. 1984 495) in toluene (50 ml) and the mixture was refluxed for 20 hours under nitrogen. The resulting mixture was cooled to room temperature and evaporated in vacuo to dryness.

The residue was dissolved in THF (25 mL) and 2N hydrochloric acid (10 mL) was added. The mixture was stirred under nitrogen gas at room temperature for 10 minutes, then ether (100 mL) was added and the resulting phases were separated. The organic phase was washed with water, brine, dried and evaporated to give a light yellow foam. The foam was dissolved in toluene (30 mL), DBN (1.5 mL) was added and stirred at room temperature for 2 hours. MDC (100 mL) and 2N hydrochloric acid (50 mL) were added and stirring continued for 5 minutes. The phases were separated and the organic phase was washed with water, brine and dried. Removal of the solvent in vacuo and purification of the residue by flash chromatography on silica gel (5: 4: 1, hexane / MDC / ether) afforded 0.6 g (39%) of 2-benzyl-4-iso-propyl-6-oxotetrahydrosaccharin as a light yellow foam.

Tetrahydrosaccharin (0.59 g, 1.7 mmol) was dissolved in toluene (50 mL) and dimethylamine hydrochloride (1.5 g, 18.0 mmol) and 4 A molecular sieve (2.0 g) were added. ). The resulting mixture was refluxed with azeotropic removal of water for 96 hours. During this 96 hours, additional dimethylamine hydrochloride (0.8 g, 10.0 mol) and 4 A molecular sieve were added every 12 hours, and after that time, the reaction mixture was cooled to room temperature and filtered. The filter cake was washed with diethyl ether (100 mL) and the combined filtrate portions evaporated in vacuo to give 0.63 g (99%) of 2-benzyl-4-isopropyl-6-dimethylamino- (4,5) -dihydrosaccharin as a pale yellow solid.

62 103115

To a solution of dihydrosaccharin (0.63 g, 1.7 nunol) in refluxing chloroform (50 mL) was added activated manganese dioxide (4.3 g, 49.5 mmol) in small portions over 4 hours. After the last 5 batches of manganese dioxide were added, the reaction mixture was refluxed for an additional 1 hour, then cooled to room temperature and filtered through a Super Cel cake eluting with ethyl acetate. The combined eluates were evaporated in vacuo to a residue and the residue was purified by flash chromatography on silica gel (5: 4: 1, hexane / MDC / ether) to give 0.32 g (50%) of 2-benzyl-4-isopropyl-6 dimethylamino-saccharin as a colorless solid.

To 2-benzylsaccharin (0.32 g, 0.9 mmol) in methanol-15 (20 mL) was added ammonium formate (0.24 g, 3.8 mmol) and the catalyst 10% Pd on carbon (0.25 g) and the mixture was boiled at reflux for 1 hour, after which the mixture was cooled to room temperature and filtered through a Super Cel cake eluting with methanol (100 mL). The combined eluates were evaporated to dryness in vacuo. The residue was dissolved in MDC (10 mL), treated with glacial acetic acid (0.25 mL) and stirred for 5 minutes, then evaporated in vacuo to give 0.25 g (100%) of 4-isopropyl-6-dimethylamino. 25 saccharin as a colorless foam.

Following a procedure similar to that described in Preparation 1 for a mixture of 4-isopropyl-6-dimethylamino-saccharin (0.27 g, 1.0 mmol), chloromethyl-phenylsulfide (0.32 g, 2.0 mmol) and tetrabutylamino-30 sodium bromide (0.1 g, 0.2 mmol) in toluene gave 0.22 g (56%) of 2-phenylthiomethyl-4-isopropyl-6-dimethylamino-saccharin, which was treated with sulfuryl chloride (1.86 mL of a 0.31 M solution). , 0.6 mmol) gave 0.15 g of a yellow gum containing 25% (by nmr) of 2-chloromethyl-35 4-isopropyl-6-dimethylamino-7-chloro-saccharin.

63 103115

Preparation 28A

31 g of 4-isopropyl-1,2-dimethoxybenzene were treated with N-bromosuccinimide followed by butyllithium and diethylcarbamyl chloride as in Preparation 6B to give 15.2 g of 2-isopropyl-4,5-dimethoxy-N, N-diethylbenzamide as a heavy duty oil. . Benzamide was treated according to Preparation 18B with butyllithium and sulfur dioxide followed by sulfuryl chloride followed by ammonia to give 4.5 g of sulfonamide; 10 mp 181-182 ° C from ether. This was cyclized in acetic acid as in Preparation 18B to give 2.86 g of 6,7-dimethoxy-4-isopropylsaccharin; mp. 210-212 ° C from ethyl acetate / hexane.

To a solution of 0.5 g of 4-isopropyl-6,7-dime-15 toxysaccharin in 3 ml of DMF was added 0.5 ml of diisopropylethylamine at room temperature. After 15 minutes, 0.35 g of chloromethylphenyl sulfide was added and the mixture was heated at 80 ° C for 16 hours. The reaction mixture was poured into EtOAc and washed with aqueous Na 2 CO 3 solution, 2N aqueous hydrochloric acid, saturated aqueous NaCl. The organic phase was separated and dried over Na 2 SO 4 and the solvents were removed. Chromatography eluting with MDC gave 0.35 g of the desired product which was used immediately. By treating the solution ·; 25 ml of a sample of 0.35 g of phenylthiomethylsaccharin in 3 ml of MDC, 0.1 ml of sulfuryl chloride for 30 minutes at 20 ° C and then removal of the solvents and trituration in hexane gave 0.3 g. 2-chloromethyl-6,7-dimethoxy-4-isopropylsaccharin.

Preparation 28B

To a solution of 5.7 g of methyl piperonylate in 20 ml of dry ether was added 30 ml of a 3.0 M solution of methyl magnesium bromide in ether at 0 ° C for 20 minutes. After stirring for 20 hours, si-35 was diluted by adding 200 ml of ether and the mixture was washed with water. The organic phase was separated, dried over Na 2 SO 4 and the solvents removed to give 5.6 g of crude 3,4-dimethoxy- (11-hydroxy-1'-methylethyl) -benzene. This material was immediately treated with 50 ml of acetic acid containing 1 g of catalyst at 10%

Pd on carbon at 3.5 kp / cm 2 hydrogen for 20 hours. The mixture was filtered to remove the catalyst and the solvent removed to give 4.5 g of 5-isopropyl-1,3-benzodioxyxol. Isopropyl dioxide was brominated, amidated, sulfonated, and cyclized as in Preparation 28A to give 700 mg of 4-isopropyl-6,7-methylenedioxysaccharin; mp. 226-228 ° C from ethyl acetate / hexane. 500 mg of saccharin was chloromethylated as in Preparation 28A to give 300 mg of 2-chloromethyl-4-isopropyl-6,7-methylenedioxysaccharin; mp. 174-176 ° C.

Other 4-R4-R5 saccharines of formula II useful as intermediates for the preparation of compounds of formula I may be prepared as follows.

Reaction of 2-trifluoromethylbenzoic acid with thionyl chloride gives 2-trifluoromethylbenzoyl chloride, which is reacted with diethylamine to give 2-trifluoromethyl-N, N-diethylbenzamide. Following a procedure similar to that described in Preparation 5, reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate, gives 2-trifluoromethyl-6-aminosulfonyl-N, N-30-diethylbenzamide, whereupon 4-trifluoromethylsaccharin is obtained by heating in glacial acetic acid.

Similarly, reacting 2-trichloromethylbenzoic acid with thionyl chloride yields 2-trichloromethylbenzoyl chloride, which then reacts with diethylamine to give 2-trichloromethyl-65,103,115Ν, Ν-diethylbenzamide. Following a procedure similar to that described for Preparation 5, reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide 5 and then with sodium hydroxylamine-O-sulfonate, gives 2-trichloromethyl-6-aminosulfonyl-N, N-diethylbenzamide, heating with glacial acetic acid gives 4-trichloromethyl saccharin.

Reaction of 4-cyclohexylbenzoic acid with 10 thionyl chloride yields 4-cyclohexylbenzoyl chloride, which is reacted with diethylamine to give 4-cyclohexyl-N, N-diethylbenzamide. Following a procedure similar to that described in Preparation 5, the latter is reacted with 15 s-butyllithium and the resulting lithium salt is reacted with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate to give 4-cyclohexyl-2-aminosulfonyl-N, N-diethylbenzamide, heating with glacial acetic acid gives 6-cyclohexylsaccharin.

Reaction of the 2-benzyl-6-amino-saccharin with methanesulfonyl chloride, trifluoromethylsulfonyl chloride or trichloromethylsulfonyl chloride in MDC in the presence of pyridine and then performing 2-benzyl protecting group transfer hydrogenolysis; 25 6-methylsulfonylamino-saccharin, 6-trifluoromethylsulfonylamino-saccharin or 6-trichloromethylsulfonylamino-saccharin.

Diazotization of 6-amino-saccharin with nitric acid in an acidic environment and decomposition of the resulting diazonium-30 salt results in the presence of copper (2) cyanide or copper (2J chloride and sulfur dioxide), or copper (2) chloride and methylmercaptan, -chlorosulfonyl-saccharin, 6-methylthiosaccharin or 6-tri-35-fluoromethylthiosaccharin By reacting 6-chlorosulfonyl-66103115 additional saccharin with in-situ ammonia or methanesulfonylamide, 6-aminosulfonyl-saccharin and 6-methanesulfonyl are respectively obtained. Oxidation of 6-methylthiosaccharin and 6-trifluoro-5-methylmethylthiosaccharin with 2 molar equivalents of 3-chloroperbenzoic acid gives 6-methylsulfonylsaccharin and 6-trifluoromethylsulfonylsaccharin, respectively.

Hydrolysis of 6-cyano-saccharin by heating in aqueous sodium hydroxide solution yields saccharin-10-n-6-carboxylic acid. Reaction of 6-cyano-saccharin with heating in the presence of a catalytic amount of sulfuric acid in ethanol provides ethyl saccharin-6-carboxylate, which is obtained by reduction of 6-hydroxymethyl saccharin with lithium borohydride. Oxidation with the said pyridine / chromium trioxide (2: 1) complex (Collins reagent) in MDC for 15 to 15 yields 6-formyl saccharin, which, by reductive amination with ammonia and sodium cyanoborohydride, yields 6-aminomethyl saccharin.

Reaction of 4-trifluoromethylbenzoic acid with thionyl chloride gives 4-trifluoromethylbenzoyl chloride, which then reacts with diethylamine to give 4-trifluoromethyl-N, N-diethylbenzamide. Following a procedure similar to that described in Preparation 5, reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate affords 4-trifluoromethyl-2-aminosulfonyl-N, N-diethylbenzamide 30 slides from which 6-trifluoromethylsaccharine a is obtained by heating in glacial acetic acid.

Reaction of 4-trichloromethylbenzoic acid with thionyl chloride yields 4-trichloromethyl-benzoyl chloride. Reaction with di-35-ethylamine gives 4-trichloromethyl-N, N-di-1110115-ethylbenzamide. Following a procedure similar to that described in Preparation 5, reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate, gives 4-trichloromethyl-2-aminosulfonyl-N, N-diethyl-benzamide , which gives 6-trichloromethylsaccharin by heating in glacial acetic acid.

Reaction of 2-ethenylbenzoic acid with thio-10-yl chloride provides 2-ethenylbenzoyl chloride, whereupon it is reacted with diethylamine to give 2-ethenyl-N, N-diethylbenzamide. By reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then sodium hydroxylamine-O-sulfonate, 2-ethenyl-6-aminosulfonyl-N, N-diethylbenzamide is obtained, which in 4-ethenyl saccharine is heated by glacial acetic acid.

Reaction of 2-ethenyl-6-aminosulfonyl-N, N-diethylbenzamide with bromine gives 2- (1,2-20 dibromoethyl) -6-aminosulfonyl-N, N-diethylbenzamide, whereupon it is reacted with sodium amide in ammonia to give 2 -ethynyl-6-aminosulfonyl-N, N-diethylbenzamide, which, by heating in glacial acetic acid, gives 4-ethynyl saccharin.

By reacting ethyl 2-aminobenzoate with two molar equivalents of benzyl chloride in acetone in the presence of potassium carbonate, ethyl 2- (N, N-dibenzylamino) benzoate is obtained by saponification of potassium hydroxide in 2 N-dibenzylamino) benzoic acid.

Reaction of the latter with thionyl chloride gives 2- (N, N-dibenzylamino) benzoyl chloride, whereupon it is reacted with diethylamine-35 to give 2- (N, N-dibenzylamino) -N, N-diethyl-68 103115 benzamide. By reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then with sodium hydroxylamine-O-sulfonate, 2- (N, N-dibenzyl) -6-amino-5-sulfonyl-N, N-diethylbenzamide is obtained. 4- (N, N-dibenzylamino) saccharin, which is catalytically debenzylated using hydrogen and palladium on carbon as the catalyst to give 4-amino-saccharin. The latter by reductively alkylating with one molar equivalent of formaldehyde in formic acid provides 4-methylamino-saccharin.

Reaction of 4-isopropyl-6-hydroxysaccharine (Preparation 19) with N, N-diethylthiocarbamyl chloride in DMF using the procedure described in Preparation 12 above gives 4-isopropyl-6- (N, N-diethylthiocarbamyloxy) saccharin, which upon heating is rearranged to 4-isopropyl-6- (N, N-diethylcarbamylthio) saccharin. The latter yields, by alkaline hydrolysis, 4-isopropyl-6-mercaptosaccharine, which by benzylation, reacting the product with methyl iodide, and transfer hydrogenolysis of the product yields 4-isopropyl-6-methylthiosaccharin. Oxidation of the latter with one or two molar equivalents of 3-chloroperbenzoic acid gives 4-isopropyl-6-methylsulfinylsaccharin and 4-isopropyl-6-methylsulfonylsaccharin.

Reaction of 2-isopropyl-4-fluorobenzoic acid with thionyl chloride yields 2-isopropyl-4-fluorobenzoyl chloride, whereupon it is reacted with diethylamine to give 2-isopropyl-4-fluoro-N, N-diethylbenzamide. By reacting the latter with s-butyllithium and reacting the resulting lithium salt with sulfur dioxide and then sodium hydroxylamine-O-sulfonate, 2-isopropyl-4-fluoro-6-amino-69,103,115 sulfonyl-N, N-diethylbenzamide is obtained. heating yields 4-isopropyl-6-fluoro-saccharin.

Reaction of the latter with thiophenoline, 4-methylphenylthiophenol, 4-methoxyphenylthiophen-5-yl, 4-chlorophenylthiophenol, 1-mercapto-4-methylnaphthalene or 1-mercaptanaphthalene by heating the reactants in DMF 4 -phenylthiosaccharin, 4-isopropyl-6- (4-methylphenylthio) saccharin, 4-isopropyl-6- (4-methoxyphenylthio) saccharin, 4-isopropyl-6- (4-chlorophenylthio) saccharin, 4-isopropyl -6- (4-methyl-1-naphthylthio) saccharin and 4-isopropyl-6- (1-naphthylthio) saccharin. Oxidation of the latter with one or two molar equivalents of 3-chloroperbenzoic acid provides 4-isopropyl-6-phenyl-15-sulfinyl-saccharin, 4-isopropyl-6-phenylsulfonyl-saccharin, 4-isopropyl-6- (4-methylphenylsulfinyl) saccharin, 4-isopropyl-6 6- (4-methylphenylsulfonyl) saccharin, 4-isopropyl-6- (4-methoxyphenylsulfinyl) saccharin, 4-isopropyl-6- (4-methoxyphenylsulfonyl) -20-saccharin, 4-isopropyl-6- (4-chlorophenylsulfinyl) - saccharin, 4-isopropyl-6- (4-chlorophenylsulfonyl) saccharin, 4-isopropyl-6- (4-methyl-1-naphthylsulfonyl) saccharin, 4-isopropyl-6- (4-methyl-1- naphthylsulfonyl) saccharin, 4-isopropyl-6- (1-naphthylsulfonyl-25'-yl) saccharin, and 4-isopropyl-6- (1-naphthylsulfonyl) saccharin.

Reaction of 4-isopropyl-6-hydroxysaccharin (Preparation 19) with one molar equivalent of acetic anhydride, benzoyl chloride or 1-naphthylcarboxylic acid chloride yields 4-isopropyl-6-acetoxysaccharin, 4-isopropyl-6-benzoyloxy, respectively 6- (l-naphthylcarbonyloxy) saccharin zag.

By heating 4-isopropyl-6-fluoro-saccharin in 35 DMF with azetidine, pyrrolidine, piperidine, morpho-70 103115 line, 1-benzylpiperidine, 1-methylpiperazine, imidazole, t-butyl α-aminoacetate or anunoniacin respectively, 6- (1-Azetidinyl) saccharin, 4-isopropyl-6- (1-pyrrolidinyl) sac-5-carrine, 4-isopropyl-6- (1-piperidinyl) saccharin, 4-isopropyl-6- (4-morpholinyl) ) saccharin, 4-isopropyl-6- (4-benzyl-1-piperazinyl) saccharin, 4-isopropyl-6- (4-methyl-1-piperazinyl) saccharin, 4-isopropyl-6- (1 H-imidazolyl) saccharin, 4-isopropyl-6- (carbo-10 t-butoxymethylamino) saccharin and 4-isopropyl-6-amino saccharin.

Debenzylation of 4-isopropyl-6- (4-benzyl-1-piperazinyl) saccharin with hydrogen and palladium on carbon as catalyst gives 4-iso-propyl-6- (1-piperazinyl) saccharin.

Hydrolysis of 4-isopropyl-6- (carbo-t-butoxycarbonylmethylamino) saccharin with dilute hydrochloric acid and isolation of the product from a neutral environment affords 4-isopropyl-6-carboxymethylamino-saccharin.

Reaction of 4-isopropyl-6-amino-saccharin with one molar equivalent of acetyl chloride yields 4-isopropyl-6-acetylamino-saccharin.

Saponification of 4-carbomethoxysaccharine (Preparation 9D) to the corresponding saccharin-4-carboxylic acid using Ύ25 alkaline hydrolysis, conversion of the acid to the corresponding acid chloride by reaction of the acid with thionyl chloride and I reacting the acid chloride with ammonia yields saccharin-4-carboxamide.

Reaction of each of the thus prepared 4-R4-R5-precipitin-30 with paraformaldehyde and chlorotrimethylsilane in the presence of tin (4) chloride in ethylene chloride gives the 4-R4-R5-2-chloromethyl-saccharines of formula IV, which are listed below. in Table B, where in each case X is Cl.

71, 103115

Table B

Preparation _ _R ^ _ ___; _ R ^ _

19A CF3 H

5 19B CC13 H

19C H 6 -cyclohexyl

19D H 6 -CH 3 SO 2 NH

19E H 6-CF 3 SO 2 NH

19F H 6-CCl 3 SO 2 NH

10 19G H 6-CN

19H H 6 -NH 2 SO 2 191 H 6 -CH 3 SO 2 NHSO 2 19 J H 6 -CH 3 SO 2 19K H 6-CF 3 SO 2

15 19L H 6-HOOC

19M H 6-HOCH2

19N H 6 -OHC

19-0 H 6-NH2CH2 19P H 6-CF3 20 19Q H 6-CCl3

19R CH = CH 2 H

19S C = CH H

19T NH 2 H

19U CH 3 NH H

25 19v (CH3) 2N h

19W CH (CH 3) 2 6 -CH 3 S

19X CH (CH 3) 2 6 -CH 3 SO

19Y CH (CH 3) 2 6 -CH 3 SO 2

192 CH (CH 3) 2 6 -F

30 19AA CH (CH 3) 2 6 -C 6 H 5 S

19AB CH (CH 3) 2. 6- (4-CH3C6H4S) 19AC CH (CH3) 2 6- (4-CH3OC6H4S) 19AD CH (CH3) 2 6- (4-ClC6H4S) 19AE ΟΗ (ΟΗ3> 2 6- (4-CH3-1-naphthyl) S) 35 19AF CH (CH 3) 2 6- (1-naphthyl-S)

19AG CH (CH 3) 2 6 -C 5 H 5 SO

19AH CH (CH 3) 2 6 -C 6 H 5 SO 2 '2 103115

Table B (continued)

Preparation R * RS _____ 19AI CH (CH3) 2 6- (4-CH3CgH4SO) 5 19AJ CH (CH3) 2 6- (4-CH3CgH4SO2) 19AK CH (CH3) 2 6- (4-CH3OCgH4SO) 19AL CH (CH3) 2 6- (4-CH 3 CO 2 H 4 SO 2) 19 AM CH (CH 3) 2 6- (4-Cl Cl 8 H 4 SO) 19 AN CH (CH 3) 2 6- (4-Cl Cl 8 H 4 SO 2) ^ 19AO CH (CH 3) 2 6- (4-CH 3 -1) naphthyl-SO) 19AP CH (CH3) 2 6- (4-CH3-1-naphthyl-SO2) 9ΔQ CH (CH3) 2 6- (1-naphthyl-SO) 19AR CH (CH3) 2 6- (1- naphthyl-S02)

19AS CH (CH 3) 2 6 -CH 3 COO

15 19AT CH (CH 3) 2 6 -C 8 H 5 COO

19AU CH (CH3) 2 6- (1-naphthyl-COO) 19AV CH (CH3) 2 6- (1-azetidinyl) 19AW CH (CH3) 2 6- (1-pyrrolidinyl) 19AX CH (CH3) 2 6- ( 1-piperidinyl) 19AY CH (CH 3) 2 6- (4-morpholinyl) 19 A Z CH (CH 3) 2 6- (4-benzyl-1-piperazinyl) 19 A B CH (CH 3) 2 6- (4-methyl-1-piperazinyl) ) 19BB CH (CH3) 2 6- (1H-imidazolyl) 19BC CH (CH3) 2 6- (NHCH2COOC4H9-t) 25 19BD CH (CH3) 2 6-NH2 19BE CH (CH3) 2 6- (1- piperazinyl) 19BF CH (CH3) 2 6- (NHCH2COOH) 19BG CH (CH3) 2 6- (CH3CONH) 19BH CONH2 h 30

; * Preparation 19BI

Reaction of isothiazole-5-carboxaldehyde with lithium 3- (triphenylphosphoranylidene) propanoate under standard Wittig conditions yields 4- (5-35 isothiazolyl) -3-butenoic acid, which by reduction and 73 103115 cyclization using 4 , 6,7-tetrahydrobenzisothiazole. The 4-oxo compound is reacted with methylene triphenylphosphorane under standard Wittig conditions and the resulting 4-methylene-5 compound is coupled with methylene using the Simmons Smith reaction to give 6,7-dihydrospiro [benzisothiazole-4 (5H), 1'-cyclopropane] which is oxidized using hydrogen peroxide in acetic acid to give 6,7-dihydro-spiro [benzisothiazole-4 (5H), 1'-cyclopropane-1,1-dioxide-10 (4-spirocyclopropyl-tetrahydro-saccharin). This is chloromethylated according to the procedure of Preparation IA to give 2-chloromethyl-4-spirocyclopropyl-4,5,6,7-tetrahydrosaccharin.

Preparation 19BJ

2-Benzyl-4-isopropyl-6-oxo-tetrahydro-saccharin of Preparation 23 is reduced with sodium borohydride and methylated with methyl iodide in the presence of sodium hydride to give 2-benzyl-4-isopropyl-6-methoxy-tetrahydrosaccharin. Debenzylation and methylation of chlorime-20 as in Preparation 23 affords 2-chloromethyl-4-isopropyl-6-methoxy-4,5,6,7-tetrahydrosaccharin.

Preparation 20A

A mixture of 10.0 g (0.063 mol) of 2,6-difluorobenzoic acid and 66.0 g (0.57 mol) of chlorosulfonic acid was heated at 155-160 ° C, then carefully poured into 100 ° C. ml of ice water. The separated solids were collected by filtration, air dried, and recrystallized from chloroform to give 7.0 g of 3-chlorosulfonyl-2,6-difluorobenzoic acid, from which 0.64 g (0.0025 mol) was dissolved in MDC and At 10 ° C, a solution of 0.25 g (0.0025 mol) of 1-methylpiperazine and 0.33 g (0.0026 mol) of diisopropylethylamine. The separated product was collected by filtration, washed with MDC and dried to give 74103115 0.4 g (50%) of 2,6-difluoro-3- (4-methyl-1-piperazinyl) sulfonylbenzoic acid.

Preparations 20B - 206

Following a procedure similar to that described above in Preparation 20A, 3-chlorosulfonyl-2,6-dichlorobenzoic acid, m.p. 172-175 ° C (from chloroform) was prepared in 56% yield by heating a mixture of 2,6-dichlorobenzoic acid with chlorosulfonic acid at 150-160 ° C.

Reaction of the latter with the appropriate amine (N-B) gave the 3-aminosulfonyl-2,6-dichlorobenzoic acids mentioned in Table C below. In each case, the products were not further purified but were used directly in the next step.

15

Table C

Preparation N> B Yield 20B 4-Morpholinyl 86 20C NHCH 2 COO-C 4 H 8 - (t) 36 20 20 D 4 -CH 3 -1-Piperazinyl 40 20E 4 -C 6 H 5 CH 2 -1-Piperazinyl 59 20 F N (CH 3) CH 2 CH 2 N (CH 3) 2 82 20G. NHCH2C00Bzl 50

··· Preparation 21A

To a mixture of 1.0 g (0.003 mol) of benzyl 2,6-dichloro-3-hydroxybenzoate and 0.18 g of a 60% dispersion of sodium hydride in mineral oil in 30 ml of DMF was added a solution, containing 0.008 mol of 4- (2-chloro-30-ethyl) morpholine in 20 ml of t-butyl methyl ether, and. the mixture was heated at 70 ° C for 3 hours. The reaction mixture was then evaporated to dryness, the residue was slurried in ethyl acetate and the organic solution was washed with water and brine, then dried and evaporated in vacuo to give 1.25 g (83%) of benzyl-2,6-di-7S 103115 chloro-3- [2- (4-Morpholinyl) ethoxy] benzoate, which was dissolved in 1: 1 ethyl acetate / methanol (50 mL) and reduced using 0.25 g catalyst 10% palladium on carbon. After completion of the reduction, the catalyst was removed by filtration, washed with DMF and the combined filtrates evaporated in vacuo to give 0.75 g (75%) of 2,6-dichloro-3- [2- (4-morpholinyl) ethoxy]. benzoic acid.

Preparation 21B

Following a procedure similar to that described in Preparation 21A, 1.0 g (0.003 mol) of benzyl 2,6-dichloro-3-hydroxybenzoate was reacted with 0.092 mol of N- (2-chloroethyl) -N, N-dimethylamine in 30 ml. DMF and 20 mL of t-butyl methyl ether-15 ethers in the presence of 0.18 g of a 60% sodium hydride dispersion of sodium hydride to give a quantitative yield of benzyl-2,6-dichloro-3- [2- ( dimethylamino otoxy] benzoate which was catalytically reduced in 5: 2 ethyl acetate / methanol using 0.2 g of cat-20 lyser with 10% palladium on carbon to give 0.2 g (22%) of 2,6-dichloro-3- [2 - (dimethylamino) ethoxy] benzoic acid.

Preparation 21C

To a solution of methyl 2,6-dichloro-4-methoxy-: 25 cibenzoate (J.Org.Chem. 50: 408 (1985)) (5.5 g, 0.023 mol) in methanol (50 ml) was added 5 ml. N sodium hydroxide solution (20 ml). The resulting mixture was refluxed for 20 hours, then cooled to room temperature, evaporated in vacuo to dryness, and the residue acidified to pH 1 with 2N chloro-1'-hydrobasic acid. The separated solids were collected by filtration to give 5.2 g (100%) of 2,6-dichloro-4-methoxybenzoic acid, which was refluxed with 60 ml of a 1 M solution of boron tribromide (0.06 mol) in 35 dichloroethane (100 ml). ml) for 2 hours. The resulting 76 103115 mixture was cooled to room temperature and poured into water / methanol (50 mL of a 9: 1 mixture). After stirring for 10 minutes, the mixture was extracted with ether (400 mL) and the organic phase was separated, washed with water and brine and dried. Removal of the solvent in vacuo gave 4.0 g (80%) of 2,6-dichloro-4-hydroxybenzoic acid.

The latter (1.05 g, 0.005 mol) was dissolved in 95% ethanol (25 ml) and Bent-10 Cyl chloride (0.71 g, 0.006 mol) and 1 N NaOH solution (5 ml) were added. The reaction mixture was refluxed for 2 hours under nitrogen, then cooled to room temperature and evaporated in vacuo to dryness. The residue was acidified by the addition of 2N hydrochloric acid and extracted with ether. The organic phase was washed with saturated NaHCO 3 solution, water and 10% NaOH solution. The organic phase was discarded, after which the NaOH washings were acidified by the addition of 2N hydrochloric acid and re-extracted with ether (2 x 20 mL). The resulting ether extract was then dried and evaporated in vacuo to give 0.63 g (42%) of benzyl-2,6-dichloro-4-hydroxybenzoate.

Following a procedure similar to that described in Preparation 21A, 630 mg of benzyl-2,6-dichloro-4-hydroxy-25-benzoate was converted to 350 mg of 2,6-dichloro-4- [2- (4-morpholinyl) ethoxy] benzoic acid.

Preparation 24A

A solution of 1.9 g (0.01 mol) of 2,6-dichloro-3-hydroxybenzaldehyde in 10 ml of dry DMF was purged with nitrogen and 0.3 g of 97% sodium was added. - *!. hydride while stirring with the same magnetic stirrer. Hydrogen was developed, which gave the clear solution a tan color. To this was added a solution of 2-dimethylamino-ethyl chloride (2.0 g of hydrochloride) in 6 ml of t-butyl-35-methylether. The solution was refluxed for 77 103115 h for 1 hour, whereupon sodium chloride precipitated. The condenser was removed and heating continued for k hours. The reaction mixture was evaporated to dryness, the residue was slurried in dilute hydrochloric acid and extracted with methylene chloride.

The aqueous phase was made basic by the addition of 10% Na2CO3 solution, extracted 3 times with CH2Cl2, followed by evaporation of the extracts to a brown oil which was distilled on a Kugelrohr apparatus; tr. 155-160 ° C / 0.12 mm. The yellow distillate crystallized and was converted to the hydrochloride using 10 solutions of hydrogen chloride in ether. Recrystallization from CH 3 CN gave 661 mg of 2,6-dichloro-3- [2-dimethylamino) -ethoxy] -benzaldehyde; mp. 177-178 ° C.

Freshly prepared silver oxide (1.7 g AgNO 3) was slurried in 1.0 ml of 10% sodium hydroxide solution, which was then heated to 55 ° C. Aldehyde (2.62 g, 0.01 mmol) was added with the same magnetic stirrer. The exothermic reaction raised the temperature to 65 ° C and silver was precipitated. Heating at 60 ° C was continued for 1/4 hour. The reaction mixture was filtered and the filtrate was extracted twice with CH 2 Cl 2. Evaporation of CH 2 Cl 2 gave 0.804 g of the starting aldehyde. The aqueous phase was acidified by the addition of 3N hydrochloric acid and evaporated in vacuo to give a white solid which was recrystallized from 10 mL of water to give 1.065 g (34%) of 2,6-dichloro-3- [2- (dimethylamino) ethoxy] - benzoic acid; mp. 234-236 ° C.

Preparations 24B - 24D

Following a procedure similar to that described above in Preparation 24A, the aldehydes and acids shown in Table D were prepared.

Table D

Lighting B-ethoxy Udehydl Yield Hiysis BCl-salt b.p. mp. aa · »to 24B 2- (1-Pyrrolidine-130-140 / 41 253-255 10 35 NylDetoxy 0.1 na 24C 2-Flpiperidine-160-180 / 54 241-242 24 Nyl Lethoxy 0.1 aa 2- (diethyl-distilled - 220-222 amino) ethoxy 78 103115

PREPARATION 25

To a solution of chlorine (15.7 g, 0.22 mol) in glacial acetic acid (250 ml) was added methyl 3-hydroxybenzoate (15.2 g, 0.1 mol) at 0 ° C. The resulting solution was warmed to room temperature where it was stirred for 1 hour then evaporated to dryness in vacuo to give 21.4 g of a yellow oil which was found to contain 75% methyl 2,6-dichloro-3-hydroxybenzoate at nmr. . The oil (21.4 g) was dissolved in acetone (600 mL), benzyl bromide (19.9 g, 0.12 mol) and potassium carbonate (22.7 g, 0.16 mol) were added to the solution and the mixture was refluxed for 16 hours. The reaction mixture was cooled to room temperature and the solids were filtered off. The filtrate was evaporated in vacuo to dryness and the ice-slurry was slurried in a solution of 10% ethyl acetate in hexane (100 mL) and the slurry was cooled in an ice bath. The resulting solids were collected by filtration and air dried to give 14.3 g (47%) of methyl 2,6-dichloro-3-benzyloxybenz-20 acetate.

A solution of methyl 2,6-dichloro-3-benzyloxybenzoate (2.1 g, 6.7 mmol) and 10% aqueous NaOH (25 mL) in methanol (25 mL) was refluxed. with cooling in nitrogen gas for 24 hours, after which it was cooled to room temperature. The resulting mixture was evaporated to half volume in vacuo and the residue acidified to pH 1 by the addition of 2N hydrochloric acid. The precipitated solids were collected by filtration, washed with water, hexane and air dried to give 2.0 g (100%) of 2,6-dichloro-3-benzyloxy-f 'sibenzoic acid as a white solid.

PREPARATION 26

A solution of 5 g of 2,6-dimethoxy-3-nitrobenzoic acid in THF was hydrogenated in the presence of a catalyst at 10% Pd C and the resulting amine was acetylated in m 79 103115 in situ using acetic anhydride. and pyridine to give 0.9 g of 3-acetylamino-2,6-dimethoxybenzoic acid.

PREPARATION 27

To a slurry of 3.6 g (0.12 mol) of paraformal-5 dehyde in 50 ml of 1,2-dichloroethane and 30 ml (26 g, 0.24 mol) of trimethylsilyl chloride was added 0.2 g of nitrogen in a protective gas. ml of tin (4) chloride and the resulting solution was stirred in a steam bath. After 30 minutes, 9.55 g (0.05 mol) of 2,6-dichlorobenzoic acid was added and the reaction mixture was heated for an additional 20 hours. The volatiles were removed, the residue was dissolved in MDC and washed with NaHCO3, dried and distilled to an oil which was triturated with hexane and then filtered to give 8.5 g of chloromethyl-2,6-dichlorobenzoate.

15 Manufacture of finished products

Example IA

A mixture of 0.5 g (0.0017 mol) of 2-chloromethyl-4,6-dimethoxysaccharin, 0.33 g (0.0017 mol) of 2,6-dichlorobenzoic acid and 17 g (0.25 ml) was added. 0.0017 mol) of triethyl-20-amine in 15 ml of toluene was refluxed for about 6 hours, then cooled and evaporated to dryness in vacuo. The residue was chromatographed on silica gel, eluting with 40% ethyl acetate / hexane, to give 0.44 g (53%) of 4,5-di-1,25-methoxy-2-saccharinylmethyl-2,6-dichlorobenzoate; mp. 200-201 ° C.

Following a procedure similar to that described above in Example IA, the compounds of Formula I listed in Table 1 below were similarly prepared.

Reactions were performed in the presence of either cesium carbonate, potassium carbonate, bicarbonate, triethylamine (TEA), diisopropylethylamine (DIPEA) or 1,8-diazabicyclo [5.4.1] -undes-7-ene (DBU). as a basic catalyst or using a sesame or thallium salt of benzoic acid and optionally in the presence of tetrabutylammonium bromide (TBAB) in an appropriate organic solvent in the column "solvent / cat." as shown. NMP is N-methylpyrrolidinone. In each example, the ID-11, IN, 1AI and 1AJ-1AN products were prepared from 4-R4-R5-2-bromo-5-style saccharin. In all other examples, the appropriate starting material was 4-R4-R5-2-chloromethyl-saccharin. Throughout this specification and elsewhere in the specification, various heterocyclic or other groups are abbreviated as follows:

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Example 1AW

The serum salt of 2,6-dichlorobenzoic acid was prepared from 4.48 g (0.0235 mol) of 2,6-dichlorobenzoic acid and 3.82 g (0.0117 mol) of CsCO 3 in methanol. The salt was isolated by removing the solvent under reduced pressure and drying under high vacuum for 1 h. The dried salt was slurried with 10-15 mL of DMF and 3.4 g (0.0117 mol) of 2-chloromethyl-6-hydroxy-4-isopropyl saccharin was added to the slurry. The mixture was heated at 80 ° C for 2-3 hours, cooled, diluted with water and extracted with 200 ml of a 7: 3 mixture of ether / ethyl acetate. The organic phase was separated, washed with water and saturated NaCl solution and dried. The solvent was removed and the residue was purified by flash chromatography eluting with ethyl acetate / hexane on silica gel to give 4.53 g (87%) of 6-hydroxy-4-isopropyl-2-saccharinylmethyl-2,6-dichlorobenzoate (m.p. ).

Example 2A

To a solution of 1.4 g (0.0026 mol) of 4-isopropyl-2-saccharinylmethyl-2,6-dichloro-3-benzyloxy-benzoate in 50 ml of ethyl acetate was added 0.3 g of catalyst 10% palladium on carbon and 0.5 ml of acetic acid and the mixture was stirred under 1 atm of hydrogen for 16 hours. The catalyst was removed by filtration and the filtrate evaporated to dryness in vacuo to give 1.16 g (100%) of 4-isopropyl-2-saccharinylmethyl-2,6-dichloro-3-hydroxybenzoate? mp. 78-80 ° C.

Example 2B

30 Following a similar procedure as described ·. in Example 2A above, 1.2 g (0.0018 mol) of 4-isopropyl-2-saccharinylmethyl-2,6-dichloro-3- (4-benzyl-1-piperazinylsulfonyl) benzoate (Example 1Z) was reduced with 50 ml of hydrogen: ethyl acetate and 2 mL of ethyl acetate 35 using 0.3 g of catalyst with 10% palladium on carbon * and the product was converted to the hydrochloride salt to give 0.5 g (68%) of 4-isopropyl-2-saccharinylmethyl-2,6- dichloro-3- (1-piperazinylsulfonyl) benzoate hydrochloride; mp. > 171 ° C.

Example 2C

A mixture of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-benzyloxybenzoate from Example 1BU (2.5 g, 4.4 mmol), catalyst 10% palladium on carbon (0.7) g) and glacial acetic acid (1 mL) in ethyl acetate (100 mL) were stirred under 3.5 kp / cm2 hydrogen pressure in a Parr hydrogenator for 1.5 hours. The resulting mixture was filtered through a Super Cel cake eluting with ethyl acetate (100 mL). The combined filtrate was washed with saturated NaHCO 3 solution, water, brine and dried.

Removal of the solvent in vacuo and crystallization from 1: 1 ether / hexane gave 2.1 g (100%) of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-hydroxybenzoate. ; mp. 152-154 ° C.

Example 2D

By a method analogous to that of Example 2A, 0.41 g of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-benzyloxycarbonylmethylamino-sulfonylbenzoate from Example 1BV was catalytically debenzylated under 1 atm of hydrogen 25 carbons in ethyl acetate with 20% acetic acid to give 0.16 g (45%) of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-carboxymethylamino-sulfonylbenzoate; mp. Mp 204-206 ° C.

Example 3Ά 30 A solution of 1.05 g (0.0024 mol) of 4-isopropyl-2-saccharinylmethyl-2,6-dichloro-3-hydroxybenzoate (Example 2A), 0.50 g (0, 0026 mol) of t-butyl α-bromoacetate and 0.48 g (0.0035 mol) of potassium carbonate in 25 ml of acetone were refluxed for 7 hours, after which it was cooled to ambient temperature, m 92, filtered and the filtrate evaporated to dryness to give 0.32 g (24%) of 4-isopropyl-2-saccharinylmethyl-2,6-dichloro-3-t-butoxycarbonylmethoxybenzoate, which was dissolved in 10 mL of MDC. of 2 ml of trifluoroacetic acid. The solution was stirred at ambient temperature under nitrogen for 2 hours, then evaporated to dryness and triturated with hexane / ether. Filtration of the resulting solid gave 0.18 g (64%) of 4-isopropyl-2-sac-10-carinylmethyl-2,6-dichloro-3-carboxymethoxybenzoate? mp. 210-212 ° C.

Example 3B

A solution of 0.78 g (1.6 mmol) of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-hydroxy-15 benzoate, 0.38 g (2.0 mmol) t -butyl-α-bromoacetate and 0.3 g (2.1 mmol) of potassium carbonate in 50 ml of acetone was refluxed for 16 hours, then cooled to room temperature, filtered and the filtrate evaporated to dryness. Purification of the residue by flash chromatography on silica gel (4: 2 hexane / ethyl acetate) gave 0.65 g (67%) of 4-isopropyl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-t-. butoxycarbonylmethoxybenzoate. The t-butyl ester (0.55 g, 0.9 mmol) was dissolved in 15 mL of MDC, where 5 mL of trifluoroacetic acid was present. The solution was stirred at room temperature under nitrogen for 2 hours, then evaporated to dryness and triturated with hexane / ether. The resulting solid was collected by filtration to give 0.4 g (82%) of 4-isopropyl-30-yl-6-methoxy-2-saccharinylmethyl-2,6-dichloro-3-carboxy-oxymethoxybenzoate; mp. Mp 206-208 ° C.

Example 4

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Example 4CB

According to the procedure of Example 4, the 2-chloromethyl-4-spirocyclopropyl-4,5,6,7-tetrahydrosaccharin of Preparation 19BI is coupled to 2,6-dimethylbenzoic acid 5 to give 4-spirocyclopropyl-4,5,6,7-tetra- tetrahydro-2-sakkrinyylimetyyli-2,6-dimetyylientsoaatti.

Example 4CC

According to the procedure of Example 4, 2-chloromethyl-4-isopropyl-6-m-ethoxy-4,5,6,7-tetrahydro-10-saccharin of Preparation 19BJ is coupled with 2,6-dimethylbenzoic acid to give 4-isopropyl-6-methoxy-4, 5,6,7-tetrahydro-2-zag karinyylimetyyli-2,6-dimethylbenzoate.

Example 5A

To a solution of 500 mg (1.1 mmol) of 6-hydroxy-15 4-isopropyl-2-saccharinylmethyl-2,6-dichlorobenzoate in 10-15 ml of THF was added 298 mg (1.14 mmol) of triphenylphosphine. , 52 mg (1.13 mmol) of ethanol and 198 mg (1.14 mmol) of diethyl azodicarboxylate at room temperature. The mixture was stirred for 1%, then chromatographed on silica gel eluting with 10% ethyl acetate / hexane to give 370 mg (70%) of 6-ethoxy-4-isopropyl-2-saccharinylmethyl-2,6 dichlorobenzoate as a white powder; mp. 140-141 ° C.

Following the procedure of Example 4A, the compounds of Table 2 were prepared from the 6-hydroxy compound of Example 1AW.

* 1% · «103115 99

Table 3

Example _Rf_ Sp._ Yield (%) 5B 6-iPro 114-115 73 5 5 C 6 -OCH 2 -? 3 123-125 70 5D 6- (OCH 2 CH 2) 2 OCH 3 119-120 74 5 E 6 -OCH 2 COOHCH 3 Foam 64 10 5F 6-OCH2CH (OCH3) CH2OCH3 Rubber 53 5G 6-O-Cyclobutyl 150-151 44

The protected glycol used in the synthesis of Example 5F was obtained as follows: A solution of 10.0 g (0.055 mol) of DL-aO-benzyl glycerol in a small amount of THF was added to a slurry of 15.38 g (0.137 g). mol) of potassium t-butoxide in 300 ml of THF. The mixture was stirred for 1 hour at room temperature, followed by 18.72 (0.132 mol) of 20 iodomethane. A white solid immediately separated. The reaction mixture was stirred for 10 hours at room temperature, cooled, carefully diluted with sodium chloride solution and extracted with ether. The organic phase was separated and washed with water with 5% hydrochloric acid solution, water and

NaCl solution and dried. The solvent was removed and the residue was purified by flash chromatography to give 1-benzyloxy-2,3-dimethoxypropane, 9.16 g (79%), as an oil.

A solution of 8.8 g (0.042 mol) of this material. 1 L in 200 mL of MeOH was hydrogenated using 1.1 g of catalyst at 10% Pd / C at 50 kp / cm 2. The catalyst was removed by filtration and the solvent under reduced pressure to give 4.4 g (87%) of 2,3-dimethoxy-1-propanol.

• · 35 103115 100

Example 51 6-Ethoxy-4-isopropyl-2-phenylthiomethyl-saccharin was prepared from the 6-hydroxy analog (Preparation 19) by the method of Example 4A in 85% yield of solid 5, m.p. 111.5-112.5 ° C, which was converted to 2-chloromethyl-6-ethoxy-4-isopropylsaccharin in a 91% yield; mp. 127-128 ° C, following the procedure of Preparation 18A.

Example 5J

To a solution of 4-isopropyl-6-hydroxysaccharinylmethyl-2,6-dichlorobenzoate from Example 1C (0.44 g, 1.0 mmol) in MDC (20 mL) was added triethylamine (0.3) at 0 ° C. g, 3.0 mmol) and trifluoromethanesulfonic anhydride (0.37 g, 1.3 mmol). The reaction mixture was stirred at 0 ° C for 10 minutes, then diluted with MDC (50 mL) and washed with saturated NaHCO 3 solution and brine and dried. Removal of the solvent in vacuo and purification of the residue by silica gel chromatography (5% ethyl acetate-20 acetate / MDC) gave 0.53 g (88%) of 4-isopropyl-6-trifluoromethanesulfonyloxysaccharylmethyl-2,6-dichlorobenzoate as a colorless foam.

Trifluoromethanesulfonate (0.28 g, 0.49 mmol) was mixed with 1-methyl-2-trimethylstannylpyrrole :: 25 (0.19 g, 0.78 mmol), tetrakis (triphenylphosphine) palladium (0) (0.012 g). , 0.01 mmol), lithium chloride (0.062 g, 1.5 mmol) and 2,6-di-t-butyl-4-methylphenol (0.01 g, 0.05 mmol) in p-dioxane (10 mL), and the mixture was refluxed under nitrogen for 30 minutes. The resulting dark reaction mixture was cooled to room temperature, diluted with ether (50 mL) and filtered through a Super Cel cake. The filtrate was washed with water and brine and dried. Removal of the solvent in vacuo and purification of the residue by flash chromatography on silica gel (7: 2: 1, hexane / MDC / ether 103115101) gave 0.22 g (92%) of 4-isopropyl-6- [2- [1-methyl]. ) -pyrrolidinyl] saccharinylmethyl 2,6-dichlorobenzoate as a pale yellow solid; mp. 125-127 ° C.

Example 5K

A solution of 4-isopropyl-6-trifluoromethanesulfonyloxysaccharinylmethyl-2,6-dichlorobenzoate prepared as in Example 5J (0.7 g, 1.2 mmol) in THF (10 mL) was cooled to To 5 ° C and to it was added 40% aqueous dimethylamine 10 (0.6 mL, 5.3 mmol) and stirred at room temperature overnight. The resulting mixture was diluted with saturated NaHCO 3 solution (20 mL) and MDC (250 mL). The resulting phases were separated and the organic phase was washed with water and brine and dried. Removal of the solvent in vacuo and purification of the residue by silica gel chromatography (6: 3: 1, hexane / MDC / ether) gave 0.2 g (35%) of 4-isopropyl-6-dimethylamino-saccharinylmethyl-2,6-dichlorobenzoate; mp. 177-179 ° C.

Example 5L

A solution of 42 mg of 4-isopropyl-6-hydroxysaccharinylmethyl-2,6-dichlorobenzoate from Example 1C, di (sec-butoxymethyl) methylamine and toluene was heated at 80 ° C for 1 hour, cooled and the volatiles was removed. Trituration with hexane to give 25 mg of 2- (2,6-dichlorobenzoyloxymethyl) -8-methyl-2,3,7,8-tetrahydro-9H- [1,3] oxazinoph 6, 5-g] benzisothiazole -3-one-l, 1-dioxide.

Example 6

A solution of 600 mg (1.1 mmol) of isopropylidene of Example 5C, Table 2, and 176 mg (0.9 mmol) of p-toluenesulfonic acid monohydrate in methanol / chloroform was stirred overnight. The mixture was chromatographed on silica gel to give 290 mg (53%) of 6- (2,3-dihydroxypropoxy) -4-isopropyl-saccharinyl-methyl-2,6-dichlorobenzoate as a foam.

103115 102

Example 7A

To a solution of 1.0 g (2.3 mmol) of 6-hydroxy-4-isopropyl-2-saccharinylmethyl-2,6-dichlorobenzoate in 40 mL of acetone was added 0.62 g of 5 (4.5 mmol) at room temperature. anhydrous K 2 CO 3 and 0.66 g (93.4 mmol) of t-butyl bromoacetate. The mixture was stirred for 4-5 hours and then filtered. The filtrate was evaporated under reduced pressure to dryness and the residue was purified by flash chromatography to give 1.13 g (90%) of 6- (2-t-butoxy-2-oxoethoxy) -4-isopropyl-2-saccharinylmethyl-2,6-dichlorobenzoate as a glass. .

Example 7B

Similarly, 6- (2-benzyloxy-2-oxoethoxy) -4-isopropyl-2-saccharinylmethyl-2,6-dichlorobenz-15 acetate was obtained as a glass in 61% yield from 6-hydroxy compound and benzyl bromoacetate.

Example 8

To freshly distilled cyclopentadiene (25 mL) at 0 ° C was added 4-bromo-2- (t-butyl) isothiazol-3 (2H) -one-1,1-dioxide (Hely.Chim.Acta 72 (1989) 1416). (7.9 g, 0.03 mol). The reaction mixture was stirred at 0 ° C for 16 hours under nitrogen, then evaporated in vacuo to dryness. The residue was purified by filtration through silica gel eluting with hexane (500 mL) and then with 20% ethyl acetate / hexane (500 mL).

The latter eluates were evaporated to dryness in vacuo to give 9.8 g (100%) of the norbornene addition product, 3a-bromo-2-t-butyl-3a, 4,7,7a-tetrahydro-4,7-methano-1,2-benz -isothiazol-3 (2H) -one-1,1-dioxide as a white solid.

A mixture of the addition product (0.4 g, 1.2 mmol) in 25 ml of ethyl acetate containing 5% Pd with CaCO 3 (0.2 g) was stirred under 1 atmosphere of hydrogen for 4 hours, followed by the reaction mixture filtered through a silica gel cake eluting with ethyl acetate (100 mL). The resulting 103115103 eluates were evaporated in vacuo to a residue and the residue was crystallized from hexane to give 0.4% (100%) brominorbornane as a white crystalline solid.

To a solution of brominorbornane (3.7 g, 5 0.011 mol) in toluene (25 ml) was added at 0 ° C diazabicycloneone (1.37 g, 0.011 mol) in toluene (10 ml). The reaction mixture was stirred at 0 ° C for 20 minutes, after which silica gel (25 g) was added. The resulting slurry was loaded onto a 15 cm silica gel cake and eluted with 10% 20% ethyl acetate / hexane (800 mL). The resulting eluates were evaporated to dryness in vacuo to give 2.8 g (100%) of the dehydrobromated compound as a white solid.

A solution of 2-t-butyl-4,5,6,7-tetrahydro-4,7-methano-1,2-benzisothiazol-3 (2H) -one-1,1-dioxide (2.8 g) (0.011 mol) in trifluoroacetic acid (30 ml) was refluxed for 48 hours, then allowed to stand at room temperature for 4 days. The resulting mixture was evaporated in vacuo to dryness, methanol (20 mL) was added to the residue and evaporated to dryness. The residue was slurried in ether (100 mL) and the slurry washed with saturated NaHCO 3 solution (1 x 50 mL). The resulting phases were separated, the aqueous phase was acidified to pH 1 by the addition of 2N hydrochloric acid and extracted with MDC (2 x 25 mL). The combined organic extracts were dried and evaporated in vacuo to give 0.9 g (42%) of the bicyclo [2.2] l-saccharin derivative as a white solid.

A mixture of bicyclo [2.2.1] saccharin derivative-30 (0.9 g, 5 mmol), chloromethylphenylsulfide (0.07 g, 7 mmol) and tetrabutylammonium bromide (0.36 g, 0.16 mmol) in toluene (50 ml), refluxed under nitrogen for 16 hours, then cooled to room temperature and evaporated to dryness in vacuo. The residue was purified by flash chromatography on silica gel (100 g) using 100% MDC as eluent to afford 1.05 g (72%) of the sulfide as a heavy duty oil.

To a solution of the sulfide (1.05 g, 3 nunol) in dichloromethane (100 mL) was added sulfuryl chloride (0.66 g, 5 mmol) and stirred for 2 hours. The resulting yellow solution was diluted with MDC (100 mL), washed with saturated NaHCO 3 solution, dried and evaporated in vacuo. The residue 10 was purified by flash chromatography on silica gel (33% MDC in hexane) to give 0.66 g (81%) of 2-chloromethyl-4,5,6,7-tetrahydro-4,7-methano-1,2-benzisothiazole. 3 (2H) -one 1,1-dioxide.

The 2-chloromethyl compound (0.66 g, 2.7 mmol) was hand-packed with a mixture of 2,6-dichlorobenzoic acid (0.56 g, 2.9 mmol), anhydrous potassium carbonate (0.55 g, 4.0 mmol) and tetrabutylammonium bromide (0.2 g, 0.6 mmol) in DMF (2.5 mL) at 70 ° C for 1 hour. The resulting mixture was evaporated in vacuo to dryness, the residue was diluted with ethyl acetate (100 mL) and filtered. The filtrate was washed with water, saturated NaHCO 3 solution, water, and brine. The organic phase was evaporated in vacuo to a residue and the residue was purified by flash chromatography on silica gel (3: 6: 1, MDC / hexane / ether: 25 ter) to give 0.5 g (47%) of 2- (2,6-dichlorobenzoyloxymethyl). -4,5,6,7-tetrahydro-4,7-methano-1,2-benzisothiazol-3 (2H) -one-1,1-dioxide as a colorless foam.

Examples 8B and 8C

It is believed that, by a method analogous to that of Example 8A, cyclohexadiene and 1,1-dimethylcyclopentadiene could be converted to 4,5,6,7-tetrahydro-4,7-ethano-1,2-benzisothiazole-3 (2H) - respectively. oni-1,1-dioxide and 8,8-dimethyl-4,5,6,7-tetrahydro-4,7-methano-1,2-benzisothiazole-3 (2H) -one-1,1-dioxide .

103115 105

Examples 9A-9D

General Procedure for Preparation of Methyl 2-Alkyl Cyclohexane-6-One Carboxylate: To a slurry of anhydrous Cul (10 mmol) in anhydrous THF (100 mL) was added Me2S (100 mmol) and the resulting solution was cooled to -78 ° C. Grignard reagent (20 mmol) was added over 15 minutes, then the mixture was stirred at -78 ° C for 1 hour and then a solution of cyclohexenone (10 mmol) in THF was added and stirring was continued for another 15 minutes. To the resulting mixture was added HMPA (5 mL) and after 15 minutes methyl cyanoformate (30 mmol) in THF (20 mL) was added and the reaction mixture was warmed to room temperature where it was stirred overnight. The reaction was quenched by the addition of 2N hydrochloric acid (50 mL), the phases formed were separated and the aqueous phase was extracted with Et 2 O (1 x 100 mL). The combined organic phases were washed with saturated NH 4 Cl solution (3 x 50 mL), water (2 x 50 mL), brine (1 x 50 mL) and dried (Na 2 SO 4). Removal of the solvent in vacuo and purification of the 20-club residue by either Kugelrohr distillation or flash chromatography gave the desired methyl 2-alkylcyclohexane-6-one carboxylate (Table E).

Table E

: '25 Intermediate Alkyl Yield Kp.

B Me 82 C Et 70 100-110 ° C (0.2 mm) D iPr 74 106-109 ° C (0.5 mm) General procedure methyl 2-benzylthio-6-alkyl-. for the preparation of cyclohex-2-enenecarboxylate and 2-benzylthio-6-alkylcyclohex-2-enenecarboxylate: A mixture of methyl 2-alkylcyclohexan-6-one carboxylate (1eq), benzylmercaptan (1.1eq) and acidic 35 clay montmorillonite, KSF (1.5 times the weight of methyl 2-103115106 alkylcyclohexane-6-one carboxylate) in anhydrous toluene (50-100 mL), was refluxed in nitrogen gas for azeotropic removal of water for 12-14 hours, it was cooled to room temperature. The solids were filtered off and washed with ether. The combined filtrate was washed with 10% Na 2 CO 3 solution, water, brine and dried. Removal of the solvent in vacuo and purification of the residue by column chromatography on silica gel (10% ether in hex-10) gave a mixture of methyl 2-benzylthio-6-alkylcyclohex-2-enecarboxylate and 2-benzylthio-6-alkyl 1-enecarboxylate (Table F), which was used in the next step as a mixture.

15 Table F

Intermediate Alkyl Combined Yield AH 40 B Me 44 C Et 50 20 D iPr 52

General Procedure for the Preparation of 4-Alkyl Tetrahydrosaccharines: A solution of methyl 2-benzylthio-6-alkylcyclohex-2-enecarboxylate and 2-benzyl: 25 lithio-6-alkylcyclohex-1-enecarboxylate (1-10 mmol) 10 ml of MDC, diluted with the addition of 20-50 ml of glacial acetic acid and 1 to 5 ml of water, then cooled to -10 ° C and bubbled with chlorine gas until the exothermic reaction subsided. The mixture was then stirred for 10 minutes and evaporated. to dryness, whereby a mixture of methyl 2-chlorosulfonyl-6-alkylcyclohex-2-enecarboxylate and 2-chlorosulfonyl-6-alkylcyclohex-1-enecarboxylate was obtained, which was dissolved in 10 ml of THF and added. ml of concentrated ammonium hydroxide solution while cooling in an ice / acetone bath. The reaction mixture was stirred for 2 hours, then evaporated in vacuo to dryness, the residue slurried in water, acidified to pH 1 by the addition of 2N hydrochloric acid and extracted with MDC. The organic phase was dried and evaporated in vacuo to give a mixture of methyl 2-aminosulfonyl-6-alkylcyclohex-2-enecarboxylate and 2-aminosulfonyl-6-alkylcyclohex-1-enecarboxylate. The mixture was dissolved in methanol and the solution was added to a freshly prepared solution of sodium methoxide (10-50 mmol) and stirred at ambient temperature for 12 hours. The reaction mixture was evaporated in vacuo to dryness, the residue was diluted with water and extracted with ether. The organic phase was separated and discarded and the aqueous phase was acidified to pH 1 by addition of concentrated hydrochloric acid and extracted with MDC. The organic extracts were obtained by washing with brine, drying and evaporation to dryness of 4-alkyl-4,5,6,7-tetrahydrobenzisothiazol-3-one-1,1-dioxy-20-dia or 4-alkyltetrahydrosaccharines (Table G).

Table G

Intermediate Alkyl Yield AH 50: 25 B Me 85 C Et 80 D iPr 74

A mixture of 4-alkyl-4,5,6,7-tetrahydro-30-benzisothiazol-3-one-1,1-dioxide (4-alkyl-tetrahydro-saccharin) (1.0 eq.), Chloromethyl-phenylsulfide (1.5 eq.) and tetrabutylammonium bromide (0.2 eq.) in toluene (25 ml / g saccharin) were refluxed under nitrogen for 16-24 hours, then cooled to room temperature. The resulting mixture was o-103115108 (1: 1 to 1: 3) to give the corresponding 2-phenylthiomethyl-4-alkyl-4,5,6,7-tetrahydrobenzisothiazol-3-one 1,1-dioxide or 2 -phenylthiomethyl-4-alkyltetrahydrosaccharin (Table H).

5

Table H

Example Alkyl Yield AH 40 10 B Me 55 C Et 40 D iPr 53

To a solution of 2-phenylthiomethyl-4-alkyl-15-litetrahydrosaccharin (1.0 eq) was added sulfuryl chloride (1.5 eq) and stirred for 2 hours. The resulting yellow solution was evaporated to dryness to give 2-chloromethyl-4-alkyltetrahydrosaccharin treated with a mixture of 2,6-dichlorobenzoic acid 20 (1.1 eq.), Anhydrous potassium carbonate (1.5 eq.) And tetrabutylammonium bromide (0 eq.). 2 eq.) In DMF (25 mL) at 70 ° C for 1 hour. The resulting mixture was evaporated in vacuo to dryness, the residue was diluted with ethyl acetate (100 mL) and filtered. The filtrate was washed with water, sat. NaHCO 3 saturated solution, water, and brine.

The organic phase was evaporated in vacuo to a residue and the residue was purified by flash chromatography on silica gel (2: 1 mixture of MDC / hexane) to give 4-alkyl-4,5,6,7-tetrahydro-2-saccharinylmethyl-2,6-dichloro. -30 ribenzoate (Table J).

103115 109

Table J

Example Alkyl Yield Sp. (° C) 8A H 63 93 - 95 8B Me 54 127 - 129 5 8C Et 50 86 - 89 8D iPr 48 108 - 110

Example 9E

Following a procedure similar to that described in Example 1AA, 2-chloromethyl-4-isopropyl-4,5,6,7-tetrahydrobenzisothiazol-3-one-1,1-dioxide was treated with 2,6-dichloro-3 - [[2 - (N, N-dimethylamino) ethyl] -N-methylaminosulfonyl] benzoic acid (Preparation 20F) to give 4-isopropyl-4,5,6,7-tetrahydro-2-precipitate-15-vinylmethyl-2,6-dichloro. 3 - [[2- (N, N-dimethylamino) ethyl] -N-methylaminosulfonyl] benzoate hydrochloride; mp. 121 ° C (dec).

Example 10

Methyl 2,2-dimethylcyclohexan-6-one carboxylate-20i: To a slurry of anhydrous CuL (70.0 g, 0.37 mol) in anhydrous ether (500 mL) was added at 0 ° C halogen-free methyl lithium (520 mL of a 1.4 M solution in ether, 0.73 mol). After stirring at 0 ° C for 15 minutes, a solution of 3 · methyl-2-cyclohexenone (20.0 g, 0.18 mol) in ether (50 mL) was added and stirring was continued. for another 1 hour. To the resulting mixture was added THF (50 mL) and HMPA (25 mL), and after 15 minutes, methyl cyanoformate (45.0 g, 0.53 mol) in THF (20 mL) and

The mixture was warmed to room temperature where it was stirred for 3 hours. The reaction was quenched by the addition of 2N

hydrochloric acid (50 ml). The resulting phases were separated and the aqueous phase was extracted with Et 2 O (1 x 500 mL). The combined organic extracts were washed with saturated NH 4 Cl solution 35 (3 x 50 mL), water (2 x 50 mL), brine (1 x 3 x 10 11 10 110 x 50 mL) and dried (Na 2 SO 4). Removal of the solvent in vacuo and purification of the residue by Kugelrohr distillation afforded 34.0 g (99%) of methyl 2,2-dimethylcyclohexan-6-one carboxylate; tr. 80-84 ° C / 0.6 mm.

Cyclohexanone was converted to 4,4-dimethyl-4,5,6,7-tetrahydro-2-saccharinylmethyl-2,6-dichlorobenzoate, m.p. 121-123 ° C following the procedure described in Example 9D above.

Example 11 10 Following the procedure of Preparation 18A, 5 g of 2-bromo-N, N-dimethylaniline was converted to 3.5 g of N, N-diethyl-2-dimethylaminobenzamide. Reaction of the amide according to the procedure of Preparation 18B gave 65 mg of 4-dimethylamino-saccharin, m.p. 228-229 ° C, in ether / hexane-15. A mixture of 11.1 g of 2,6-dichlorobenzoyl chloride, 1.9 g of paraformaldehyde and 0.1 g of fused zinc chloride was heated at 100 ° C for 2 hours, followed by distillation under vacuum to give 3.5 g. g of chloromethyl-2,6-dichlorobenzoate, which was collected above 20 145 ° C under suction pressure and solidified on cooling, m.p. 70-72 ° C. To a solution of 4-dimethylamino-saccharin and 0.1 ml of diisopropylethylamine in 1 ml of dry acetonitrile was added 100 mg of chloromethyl-2,6-dichlorobenzoate. The mixture was stirred at room temperature for 25 hours at room temperature and then at 50 ° C for 24 hours at which time TLC (MDC) showed complete reaction. The mixture was poured into EtOAc and extracted with saturated NaHCO 3 solution. The organic phase was dried and the solvent removed under reduced pressure, after which 15 mg of 4-dimethylamino-2-saccharinylmethyl-2,6-dichlorobenzoate were chromatographed using MDC.

Claims (2)

103115 111 A process for the preparation of 2-chloromethyl-saccharin having the formula: Wherein R 4 is hydrogen, halogen, lower alkyl, perfluoro (lower alkyl), perchloro (lower alkyl), lower alkenyl, di. (lower alkyl) amino, (lower alkyl) oxy or phenyl; R5b is hydrogen, or one to two substituents at any position 5, 6 or 7 independently selected from the group consisting of halogen, cyano, nitro, -N-B ', 1- (lower alkyl) -2-pyrrolyl, lower alkyl, polyfluoro (lower alkyl), polychloro (lower alkyl), cycloalkyl, lower alkoxy, methylenedioxy, cycloalkyloxy, (lower alkyl) sulfonyl, (lower alkyl) poly (lower alkylene) oxy, acetal or ketal of polyhydroxy (lower alkoxy) ), poly (lower alkoxy) - (lower alkoxy), (lower alkyl) thio, (lower alkyl) -25 sulfinyl, (lower alkoxy) carbonyl, -O- (alkylene) -C00- (lower alkyl), and -0 - (alkylene) -N-B ', and -N = B' is di (lower alkyl) amino, 1-pyrrolidinyl, 1-piperidinyl, 4-morpholinyl, 4- (lower alkyl) -1-piperazinyl or 4 benzyl-l-piperazinyl; 30 characterized in that the saccharin of the formula: is reacted with chlorosilane and formaldehyde or formaldehyde equivalents in the presence of a Lewis acid. Process according to Claim 1, characterized in that the process is carried out in 1,2-dichloro-5-ethanone, said formaldehyde equivalent is para-formaldehyde, said chlorosilane is chlorotrimethylsilane and said Lewis acid is tin (4) chloride. 103115 113