AP443A - Prodrugs of antiinflammatory 3-acyl-2-oxindole -1-carboxamides. - Google Patents

Abstract

Antiinflammatory and analgesic oxindole prodrugs of the formula wherein r10, r11, r12 and r13 are hydrogen, alkyl or halogen and r is methyleneoxyalkanoyl, methyleneoxyalkenoyl or alkenoyl.

Description

PRODRUGS OF ANTIINFLAMMATORY 3-ACYL-2-OXINDOLE-1 -CARBOXAMIDES

The present invention is concerned with antiinflammatory and analgesic agents and, n particular, with enol esters and ether prodrugs of 3-acyl-2-oxindole-1carboxamides, a class of known nonsteroidal antiinflammatory agents.

Background of the Invention

The use of oxindoles as antiinflammatory agents has been reported in U.S. 3,634/53, and consisted of 1-substituted-2-oxindole-3-cart>oxamides. Recently, a series of 3-acyl-2-oxindole-1-carboxamides was disclosed in U.S. 4,556,672 to be inhibiters of the cyclooxygenase (CO) and lipoxygenase (LO) enzymes and to be usefeJ as anagesic and antiinflammatory agents in mammalian subjects. Certain prodrugs of 3-acyl-2-oxindoles-1-carboxamides are described in commonly owned U.S. 5,118,703 which are of the formula:

R¹

I

wherer X and Y are each hydrogen, fluoro or chloro; R¹ is 2-thienyl or benzyl; and R is alkanoyl of two to ten carbon atoms, cycloalkylcarbonyl of five to seven carbon atoms, phenylalkanoyl of seven to ten carbon atoms, chlorobenzoyl, methoxybenzoyl θθ thenoy. omega-alkoxycarbonylalkanoyl said alkoxy having one to three carbon atoms and sad alkanoyl having three to five carbon atoms; alkoxy carbonyl of two to ten carbon atoms; phenoxycarbonyl; 1 -(acyloxy)alkyl said acyl having one to four carbon atoms and said alkyl having two to four carbon atoms; 1-(alkoxycarbonyloxy)alkyl said alkoxy having two to five carbon atoms and said alkyl having one to four carbon atoms:

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-2alkyl of one to three carbon atoms: aJkylsulfonyl of one to three carbon atoms; methylphenylsulfonyl or diaJkylphosphonate said alkyl each having one to three carbon atoms. United States Patent 5,118,703 and United States Patent No. 4,556,672 are hereby incorporated by reference.

SUMMARY OF THE INVENTION

The present invention provides antiinflammatory ether and ester prodrugs of the formula wherein R is

R⁹ 0 0

OR

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wherein χ is Ο or 1;

A is a C,-C₅ alkylene or C₂-C_e alkenyl chain, optionally substituted with up to 15 two substituents independently selected from C,-C, alkyl or C₃-C₇ cycloalkyl; or (CH₂)_nO(CH₂)_m, where the methylene groups may be optionally substituted with up to two substituents independently selected from 0,C₇ alkyl or C₃-C₇ cycloalkyl; or a C₃-C₇ cycloalkyl or cycloalkenyl group optionally substituted with up to two C,-C₃ alkyl groups; or a 4 - 7 membered hetero-alicyclic group containing an O, S or NR⁶ link; or a phenylene group optionally substituted with up to two substituents 25 independently selected from C,-C₃ alkyl, C,-C₃ alkyloxy, halogen or CF₃;

B is a C₂-C₆ alkenyl phenyl, 2, 3 or 4-pyridyl, 2, 3 or 4-piperidinyl, 2 or 3pyrrolidyl, OCH₂CO₂R’ or OCH₂CONR²R³;

R’ is H, 0,-0, alkyl, C₃-C₇ cycloalkyl, phenyl(C,-C₄)alkyl, (CH₂)_PCO₂R², or (CH₂)_PCONR²R³;

or R¹ may form with A a 5, 6 or 7 membered lactone ring optionally substituted with a C,-C₃ alkyl group;

R² and R³ are independently H, 0,-0, alkyl, C₃-C₇ cycloalkyl, phenyl(C,-C₄)alkyl; or

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-4R² and R³, when taken together with the attached nitrogen, may represent a pyrrolidine, piperidine, morpholine or homopiperidine group optionally substituted with up to two C,-C₃ alkyl groups; or

R² or R³ may form with A, a 5, 6 or 7 membered lactam ring, optionally substituted with up to two C,-C₃ alkyl groups;

R⁴ and R⁵ are independently H, C,-C7 alkyl C3-C7 cycloalkyl, phenyl(C,CJalkyl, (CH2)PCO2R², (CH2)_pCONR²R³, (CH2)pNR⁷R⁸, (CH2)_pOR⁸ or (CH₂)_pSR⁶; or

R⁴ and R⁵ when taken together represent a C₃-C₇ cycloalkyl ring, optionally f' substituted with up to two C,-C₃ alkyl groups;

R⁶ is H, C,-C6 alkyl, (CH2)pCOOR², C3-C₇ cycloalkyl optionally substituted with up to two C,-C₆ alkyl groups, phenyl(C,-C₄)alkyl optionally substituted on the phenyl ring with up to two substituents independently selected from C,-C₃ alkyl, C,-C₃ alkoyloxy, halogen or CF₃, COR², CONR²R³, or a phenyl group optionally substituted with up to two substituents independently selected from Ο_ΓΟ₃ alkyl, C,-C₃ alkyloxy, halogen or CF₃; or when taken with R⁴ and the attached oxygen, may represent an oxetan, tetrahydrofuran, tetrahydropyran or oxepan ring optionally substituted with up to two C,-C₃ alkyl groups;

R⁷ and R⁸ are independently H, C,-C₆ alkyl, C₃-C₇ cycloalkyl, phenyl(C,C CJalkyl, COR², COOR²; or independently C₂-C₇ alkanoyl, C₄-C₈ cycloalkanoyl, optionally substituted with up to two substituents independently selected from C,-C_s alkyl, C₃C₇ cycloalkyl, phenyl(C,-C₄)alkyl, C₃-C₇ branched alkyl; or

R⁷ and R⁸ when taken together with the attached nitrogen may represent a pyrrolidine, piperidine or homopiperidine group optionally substituted with up to two substituents independently selected from C,-C_e alkyl, C₃30 C₇ cycloalkyl, C₃-C₇ branched alkyl, or oxo;

R⁹ is H or methyl;

R¹⁰, R”, R'² and R¹³ are independently selected from hydrogen, C,-C₄ alkyl and halogen;

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-5m and n are independently 0, 1 or 2 where either m or n must be at least 1; and p is 1 to 3.

Particularly preferred are compounds of formula I wherein one of R¹⁰ and R¹’ is 5-fluoro and the other is 6-chloro.

A second preferred group of compounds are those of formula I wherein one of R’° and R” is 5-fluoro and the other is 6-chloro and R is formula II, wherein x is 0, A is a C₂-C_e alkenyl chain and R¹ is hydrogen. Especially preferred within this group are compounds where A is -CH=CH- with E geometry and R¹² and R’³ are hydrogen. Also preferred within this group are compounds where x is 1, A is alkylene and R’ is benzyl.

A third preferred group of compounds are those of formula I where one of R¹⁰ and R¹¹ is 5-fluoro and the other is 6-chloro and R is formula IV and x is 1. Especially preferred within this group are compounds where R⁴, R⁹, R¹² and R¹³ are hydrogen, R⁵ is hydrogen, methyl or ethyl and FT is hydrogen, methyl, benzyl or CH₂COOR².

A fourth preferred group of compounds are those of formula I where one of R'° and R'¹ is 5-fluoro and the other is 6-chloro, x is 1 and R is formula V. Preferred within this group are compounds where R⁴, R⁹, R⁷, R⁸, R¹² and R’³ are hydrogen, and R⁵ is (CH₂)_pNR⁷R^e, methyl or benzyl. Also preferred within this group are compounds where R⁷ is COR².

A fifth preferred group of compounds are those of formula I where one of R¹⁰ and R is 5-fluoro and the other is 6-chloro, x is 1, R is formula VI and B is 2- or 3pyrrolidine.

The present invention also comprises a method for treating inflammation in a mammal which comprises administering to said mammal an antiinflammatory effective amount of a compound selected from those of formula 0).

The present invention further comprises a method for treating pain in d mammal which comprises administering to said mammal an analgesic effective amount of a compound selected from those of formula (I).

DETAILED DESCRIPTION OF THE INVENTION

The enol ethers and esters of the present invention are not enolic acids as are the parent compounds and have the potential to show reduced gastric irritation when compared to said parent compounds.

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The term prodrug refers to compounds which are drug precursors which, following administration and absorption, release the drug in vivo via some metabolic process.

While all of the usual routes of administration are useful with the invention compounds, the preferred route of administration is oral. After gastrointestinal absorption the present compounds are hydrolyzed in vivo to the corresponding compounds of formula (I) where R is hydrogen, or a salt thereof. Since the prodrugs of the invention are not enolic acids, exposure of the gastrointestinal tract to the acidic

IQ parent compound is thereby minimized. Further, since gastrointestinal complications have been noted as a major adverse reaction of acid non-steroidal antiinflammatory drugs [see e g., DelFavero in Side Effects of Drugs Annual 7, Dukes and Efe. Eds. Excerpta Medica, Amsterdam, 1983, p. 104-115], the invention compounds (I) are likely to have a distinct advantage over the parent enolic compounds.

In converting the 3-acyl-2-oxindole-1 -carboxamides to the compounds of formula

I. the substituents on the exocyclic double bond at the 3-position can by syn, anti or a mixture of both. Thus, the compounds of the structures

and

or mixtures thereof are depicted as

R¹ ι

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All forms of these isomers are considered part of the present invention.

The 3-acyl-2-oxindole-1 -carboxamides required as starting materials are available by methods well known in the art, see, for example, U.S. patents 3,634,453 and

4,556,672. The other starting reagents noted above are available commercially, or are prepared by well known methods, or are described in the preparation section hereinbelow.

The preparation of the compounds of the present invention is readily achieved. A salt of the appropriate 3-acyl-2-oxindole-1-carboxamide is formed in a reaction inert solvent and used with or without isolation in a subsequent reaction with an acid halide or oc haioalkyl ester. Conditions of these reactions are not critical; temperature may vary from about 0°C to about 50°C with a preferred range being about 0°C to about 20°C. The reaction time will vary with the selected reactants and temperature, but ranges from about 8 to 90 hours with the preferred time being about 20 hours.

The salt of the 3-acyl-2-oxindole-1-carboxamide may be alkali metal, tertiary amine or quaternary ammonium. AlkaJi metals include lithium, sodium and potassium. Tertiary amines are generally low molecular weight aliphatic amines such as trimethylamine, triethylamine, tributylamine and mixed animes such as diisopropylethylamine, diethyl aminopyridine; and heterocyclic amines such as pyridine and N-methylmorpholine. Quaternary ammonium compounds may be symmetrical or mixed alkyl amines of straight or branched chains. Sodium, diisopropylethylamine, triethylamines and tetrabutylammonium salts are preferred.

The acid halide may be the chloride or bromide; the chloride is preferred. Alpha halo esters may be chloro, bromo or iodo esters with chloro and iodo being preferred.

The chloro ester is preferably used with sodium iodide, thus generating the iodo ester in situ.

Bioavailability of the prodrugs of the present invention was determined by comparison of the prodrug to the parent compound.

For example 3-[hydroxy-2(thienyl)methylene]-6-chloro-5-fluoro-2,3-dihydro-2-oxo³⁰ 1 H-indole-1 -carboxamide and selected prodrugs were orally administered to fasted male Sprague-Dawley rats at dose levels of 3 mg equivalents 3-[hydroxy-2(thienyl)methylene]6-chloro-5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide/kg as a solution or suspension in 0.1% methylcellulose. Dosing volumes of each drug formulation were maintained at 1 mL per 1 kg bodyweight. Following oral administration, blood samples

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-810 were obtained by retroorbital sinus bleeding into heparinized tubes at 1,3 and 6 hours post-dose and immediately chilled. Plasma was stored at -20° C until analysis.

Plasma concentrations of 3-[hydroxy-2(thieny1)methylene]-6-chloro-5-fluoro-2,3dhydro-2-oxo-1 H-indole-1-carboxamide following administration of 3-[hydroxy2 thienyl)methyiene]-6-chloro-5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1 -carboxamide and prodrugs were determined by high pressure liquid chromatography with ultraviolet detection at 360 rvn. The lower limit of quantitation for 3-[hydroxy-2(thienyl)methy1ene]6-chloro-5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide was 0.2 pg/mL

Area under the concentration vs. time curve [AUC(0-6 hr)] were determined by the linear trapezodal method for 3-[hydroxy-2(thienyl)methylene]-6-chloro-5-fluoro-2,3dnydro-2-oxo-1 h-indole-1-carboxamide following oral administration of 3-[hydroxy2 thienyl)methylene]-6-chloro-5-fluoro-2,3-dihydro-2-oxo-l H-indole-1-carboxamide and each prodrug. Felative bioavailability for 3-[hydroxy-2(thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide following administration of each prodrug was assessed by determining the ratio of the 3-[hydroxy-2(thienyl)methylene]-6cNoro-5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide AUC(0-6) value following administration of prodrug to the 3-[hydroxy-2(thienyl)methylene]-6-chloro-5-fluoro-2,3dihydro-2-oxo-1 H-indole-1 -carboxamide AUC(0-6) value following administration of 3[hydroxy-2(thienyl)methylene]-6-chloro-5-fluoro-2,3-cihydro-2-oxo-1 H-indole-1carboxamide.

The prodrugs of formula (I) are evaluated for their antiinflammatory and analgesic activity according to known methods such as the rat foot edema test, rat adjuvant-induced arthritis test or phenylbenzoquinone-induced writhing test in mice, as previously used in the evaluation of the parent compounds and described in the references cited above and elsewhere in the literature; see e.g., C. A. Winter, in •Progress in Drug Research edited by E. Jucker, BirkhauserVerlag, Basel, Vol. 10, pp.

133-192 (1966).

On a molar basis, the present prodrugs are generally dosed at the same level and frequency as the known 3-acyl-2-oxindole-1-carboxamides from which they are vv derived. However, the non-enolic nature of the present compounds should generally permit higher tolerated oral doses, when such higher dosage is required in the control of pain and inflammation.

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-9Tne present prodrugs are also formulated in the same manner, and administered by the same routes as the known parent compounds, as described in the above cited references. The preferred route of administration is oral, thus taking particular advantage of the non-enolic nature of the present compounds.

The present invention is illustrated by the following examples, but is not limited to the specific details of these examples.

Example 1

6-Chloro-5-fluoro-2,3-dihvdro-3f(4-methoxvbenzovl)oxv-(2-thienvl)methvlene1-2-oxo-t-H10 indole-1 -carboxamide ( 3-[Hydroxy-2(-thienyl)methy1ene]-6-chloro-5-fluoro-2,3-dihydro-2-oxo-1H-indole-1carboxamide (5.08 g, 15.0 mmole) was slurried in CH₂CI₂ and treated with triethylamine (1.67 g, 15.5 mmole). This yellow solution was chilled in an ice water bath and treated with 4-methoxybenzoyl chloride (12.8 g, 75.0 mmole) in one portion. After 18 hr. the reaction mixture was filtered to remove a yellow precipitate. The filtrate was diluted with additional CH₂CI₂ and washed with 1N HCI (2X) and saturated NaHCOj/brine mixture. After drying with MgS0₄, filtration, concentration and chasing with ethanol (2X), a solid was obtained which was triturated with EtOAc/hexane. This was collected, combined with the solid that was directly removed from the reaction mixture and the whole recrystallized from EtOAc/hexane (4/1) and some acetone yielding 1.81 g (26%) of the desired product as yellow crystals: mp 220-221 °C; Anal, calculated for

C₂₂H₁₄CIFN₂O₅S: C, 55.88; H, 2.98: N, 5.92. Found: C, 56.04; H, 2.82; N, 5.88.

Example 2 ²⁵ 6-Chloro-5-fluoro-2,3-dihydro-3f(cinnamovl)oxv-(2-thienvl)methvlene1-2-oxo-1-H-indole-1carboxamide

The title compound was prepared by the procedure of Example 1 with the exception that cinnamoyl chloride was used: mp 214-215°C; AnaJ. calculated for C₂₃H₁₄CIFN₂O₄S: C, 58.91; H, 3.01; N, 5.97. Found: C, 58.52; H, 2.89; N. 5.91.

Example 3

6-Chloro-5-%uoro-2,3-dihvdro-3-i(3-methoxvbenzovl)oxv-(2-thienvl)methylenel-2-oxo-1 Hindole-1 -carboxamide

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-10The trte compound was prepared by the procedure of Example 1 with the exception that 3-methoxybenzoyl chloride (4 equiv.) was used and chloroform was the solvent. The product was recrystallized from isopropyl alcohol: mp 196-220°. The Ή

NMR spectrum indicated the sample containd both the E and Z geometrical isomers 5 of the title compound in a ratio of 17:83. Anal, calculated for C₂₂H₁₄CIFN₂O₅S: C, 55.88; H, 2.98: N, 5.92. Found: C, 56.00; H, 2.82; N, 5.78.

Example 4

6-Chloro-5-fluoro-2,3-dihydro-3-f(2-methoxvbenzoyl)oxv-(2-thienvl)methYlenel-2-oxo-1Hindole-1 -carboxamide

C The title compound was prepared by the procedure of Example 1 with the exception that 2-methoxybenzoyl chloride was used and chloroform was the solvent. The crude product was purified by flash chromatography on silica gel (eluting with 95:5 CHCl/MeOH) followed by recrystallization from isopropyl alcohol: mp 219-221 °. The ¹5 ’ H NMR spectrum indicated the sample contained only the E geometrical isomer of the title compound Anal, calculated for C₂₂H₁₄CIFN₂O₅S: C, 55.88: H, 2.98; N, 5.92. Found: C, 55.32; H, 3.01; N. 5.66.

Example 5

6-Chloro-5-fluoro-2,3-dihvdro-3-fnicotinovloxy-(2-thienyl)methvlene12-oxo-1H-indole-1carboxamide θ The title compound was prepared by the procedure of Example 1 with the exception that nicotinoyl chloride (2.5 equiv.) and 3.4 equiv, of triethylamine were used and chloroform was the solvent. The crude product was purified by flash chromatography (using 83:17 CHCl/MeOH as eluant) followed by recrystallization from isopropyl alcohol: mp 201-202.5°. Anal, calculated for C_2oH_nCIFN₃O₄S: C, 54.12; H, 2.50; N, 9.47. Found; C, 54.01; H, 2.46; N, 9.30.

Example 6

6-Chloro-5-fluoro-2,3-dihydro-3-risonicotinoyloxv-(2-thienv0methvleneF2-oxo-1H-indole-1carboxamide

The title compound was prepared by the procedure of Example 1 with the exception that isonicotinoyl chloride (1.1 equiv.) and diisopropylethylamine (2 equiv.)

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-11were used. The product, obtained directly by filtration of the reaction mixture, was recrystallized from isopropyl alccnol: mp 219.5-221°. Anal, calculated for C_;cH,₁CIFN₃0₄S: C, 54.12; H, 2.50; S. 9.47. Found; C, 54.11; H, 2.43; N, 9.32.

Example 7

6-Chloro-5-fluoro-2,3-dihvdro-3-fpicoinovloxv-(2-thienvhmethylenel-2-oxo-1 H-indole-1carboxamide

The title compound was preoared by the procedure of Example 1 with the exception that picolinoyl chloride (1.1 equiv.) and diisopropyl-ethylamine (2 equiv.) were used. The product, obtained directly by filtration of the reaction mixture, was recrystallized from isopropyl aJcsbol: mp 184-185°. Anal, calculated for C~H,,CIFN₃O₄S: C, 54.12; H, 2.50; N. 9.47. Found: C, 53.73; H, 2.34; N, 9.31.

Example 8 15

6-Chloro-5-Fluoro-2-3-dihvdro-3-f3-(ethvloxycarbonvl)propenovloxv-(2thienyl)methylenel-2-oxo-1 H-indole-1 carboxamide

a) 3-(Ethyloxycarbonyl)propenoy chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc, 1930, 52, 3430).

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(ethyloxycarbcnyl)propenoyl chloride (2 equiv.) and ( diisopropylethyiamine were used. The crude product was purified by flash chromatography (eluting with CHG₃ and then 98:2 CHClj/MeOH) followed by recrystallization from isopropanol: mp 165.5-168°. The Ή NMR spectrum indicated the sample to contain both the E and Z geometrical isomers of the title compound in a ratio ²⁵ of 22:78. Anal calculated for C₂₀H₁₄CFN₂O₆S: C, 51.68: H, 3.04; N, 6.03. Found: C, 51.42; H, 3.08; N, 5.86.

Example 9

6-Chloro-5-fluoro-2,3-dihvdro-3-i3-(methvloxvcarbonyl)propenovloxv-(230 fhienyl)mefhylenel-2-oxo-1 H-indole-1 -carboxamide

a) 3-(Methyloxycarbonyl)propencyf chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc, 1930, 52, 3430).

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(methyloxycarbonyl)propenoyl chloride (2 equiv.) and

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-12diisopropylethylamre were used. The crude product was purified by flash chromatography (euting with 95:5 CF^CI^PrOH) followed by recrystallization from isopropanol: mp 163.5-186°. The Ή NMR spectrum indicated the sample to contain both the E and Z geometrical isomers of the title compound in a ratio of 34:66. Anal, calculated for C₁₃H.CIFN₂O₅S: C, 50.62; H, 2.68; N, 6.21. Found: C, 50.56; H, 2.84; N, 6.04.

Example 10

6-Chloro-5-fluoro-2 3-dihvdro-3-fbenzYloxvacetvloxv-(2-thienvl)methylenel-2-oxo-1Hindole-1 -carboxam ice

The title compound was prepared by the procedure of Example 1 with the exception that benz/ioxyacetyl chloride (2 equiv.) and diisopropylethylamine (2 equiv.) were used. The crude product was purified by flash chromatography (eluting with

CHCI₃) and followed by recrystafization from isopropyl alcohol: mp 150-175°. Anal, calculated for C₂₃H-_iCIFN₂O₅S: C. 56.74; H, 3.31; N, 5.75. Found: C, 58.41; H, 3.17; N, 5.00.

Example 11

6-Chloro-5-fluoro-2,3dihydro-3-f4-{benzvloxvcarbonvl)benzovloxv-(2-thienvl)methvlenel2-ΟΧΟ-1 H-indole-1 -carboxamide

The title compound was prepared by the procedure of Example 1 with the exception that 4-{benzyloxycarbonyl)benzoyl chloride (1.5 equiv.) and diisopropylethylamine (1.5 equiv.) were used. The crude product was purified by trituration with CHCk mp 212-218°. Anal, calculated for C₂₉H,₈CIFN₂O₆S: C, 60.37; H, 3.14; N, 4.85. Found: C, 60.94; H, 3.00; N, 4.27.

Example 12

6-Chloro-5-fluoro-2.3<fihvdro-3-f3-carboxvpropenovloxv-{2-thienvl)methvlene]-2-oxo-1H³⁰ indole-1 -carboxamide

a) 3-(2-TrimethySsilylethyloxycarbonyl)propenoyl chloride was prepared according to a modification of the procedure of Lutz (J. Am. Chem. Soc., 1930, 52, 3430) in which remaining fumaryt chloride and unwanted diester are removed by distillation under vacuum leaving the desired add chloride behind in the pot.

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AP Ο Ο Ο 4 4 3 •13b) The title compound was prepared by the procedure of Example 1 with the excepoon that 3-(2-trimethylsilylethyl-oxycarbonyl)propenoy1 chloride (1.3 equiv.) and diisopropylethylamine were used. The crude product was purified by flash chromatography (using CH₂CI₂, 99:1 CH₂Clj/MeOH and then 98:2 CHjCIj/MeOH as eluants) followed by recrystallization from acetonitrile.

c) Hydrogen fluoride/pyridine complex (500 g) was cooled in an ice bath in a polyethylene botte. The 3-(2-trimethylsily1ethy1oxycarbonyl)propenoyl derivative (33.84 g, 63 mmol) was then added 2-3 g portions. When the addition was complete, the o resulting slurry was agitated in the cold for 0.5 hr. The reaction was then quenched by addition of H₂O. After drying in vacuo, the product was purified by trituration with hot ethyl acetate. The yield was 19.8 g. An analytical sample was obtained by recrystallization of a small sample from acetic acid: mp 229-232°. The Ή NMR spectrum indicated the sample to contain only the E geometrical isomer of the title compound. Anal, calculated for C,₈H₁₀CIFN₂O_eS: C, 49.50; H, 2.31; N, 6.41. Found: C, 49.23; H, 2.23; N, 6.37.

Example 13

6-Chloro-5-fluoro-2.3-dihvdro-3-f3-carboxvbenzoyloxv-(2-thienvl)methvlene1-2-oxo-lHindole-1 -carboxamide

a) A solution of isophthaloyl dichloride (40.6 g, 200 mmol) and 2,2,2trichloroethanol (30.9 g, 207 mmol) in toluene was heated at reflux for 24 hr. The sotvent was evaporated and the remaining material was distilled under vacuum. The desired product distilled over along with some of the unwanted bis(2,2,2trichloroethyl)ester between 125° and 170° at 0.2 mm Hg. On standing, this unwanted side product separated out as a solid. The desired product, 3-(2,2,2-trichloroethyloxycarbonyl)benzoyl chloride (19.0 g) was decanted off for use in the next step.

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(2,2,2-trichloroethyloxycarbonyl)benzoyl chloride (2 equiv.) and θθ diisopropylethylamine (2 equiv.) were used. The product, obtained directly by filtration of the reaction mixture, was triturated with CHCI₃.

c) A solution of the 3-(2,2,2-trichloroethyloxycarbonyl)benzoyl derivative (1.0 g, 1.6 mmol) in acetic acid (50 mL) was treated with zinc dust (1.0 g, 16 mmol). The mixture was wanned in an oil bath at 50° for 18 hr. While still warm, the mixture was filtered

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-14(washing with acetic acid) and, after cooling to room temperature, the filtrate was poured into H₂O (250 mL). The precipitated yellow solid, 6-chloro-5-fluoro-2,3-dihydro3-[3-carboxybenzoyloxy-(2-thienyl)methylene]-2-oxo-1 H-indole-1-carboxamide was collected by filtration and recrystallized from acetic acid: mp 244-248°. The yield was 130 mg. Anal, calculated for C,₉H,₄CIFN₂O₉S: C, 50.40; H, 3.12; N, 6.19. Found: C, 51.21; H, 2.96; N, 5.99.

Example 14

6-Chloro-5-fluoro-2,3-dihvdro-3-[butyloxvcarbonvl)propenovloxv-)2-thienvl)methvlene1-2oxo-1 H-indole-1 -carboxamide

a) 3-(Butyloxycarbonyi)propenoyl chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc., 1930, 52, 3430).

b) The title compound was prepared by the procedure of Example 1 with the 15 exception that 3-(butyloxycarbonyl)propenoyl chloride (2 equiv.) and diisopropylethylamine were used. The crude product was purified by flash chromatography (using CH.CI₂, 95:5 CH₂Clj/MeOH and then 90:10 CHjCl/MeOH as eluants) followed by recrystallization from acetonitrile: mp 196-197°. The Ή NMR spectrum indicated the sample to contain only the E geometrical isomer of the title

2Q compound. Anal, calculated for C₂₂H₁₈CIFN₂O_eS: C, 53.61; H, 3.68; N, 5.68. Found: C, 53.53; H, 3.55; N, 5.78.

Example 15

6-Chloro-5-fluoro-2,3-dihvdro-3-f3-(octyloxvcarbonvl)propenovloxv-(2-thienvl)methvtenel2-oxo-l H-indole-1 -carboxamide 25

a) 3-(Octyloxycarbonyl)propenoyl chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc., 1930, 52, 3430).

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(octyloxycarbonyl)propenoyl chloride (2 equiv.) and diisopropylethylamine were used. The crude product was purified by flash 30 chromatography (using 99:1 CH₂CI₂/MeOH as eluant) followed by recrystallization from acetonitrile: mp 140-148°. The Ή NMR spectrum indicated the sample contained both the E and Z geometrical isomers of the title compound in a ratio of 33:67. Anal, calculated for C₂₆H₂₆CIFN₂O₆S: C, 56.88; H, 4.77; N, 5.10. Found: C, 56.81; H, 4.62; N, 5.07.

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AP Ο Ο Ο 4 4 3 •15Example 16

6-Chloro-5-fluoro-2.3-dihydro-3-i3-(4-phenvlbutvloxvcarbonyl)propenovloxv-(2thienvl)methylene1-2-oxo-1 H-indole-1 -carboxamide

a) 3-(4-Phenylbutyloxycarbonyl)propenoyl chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc., 1930, 52. 3430).

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(4-phenylbutyloxycarbonyl)propenoyl chloride (2 equiv.) and diisopropylethylamine were used. The crude product was purified by flash chromatography (using 98:2 CH₂CI₂/MeOH as eluant) followed by recrystallization from acetonitrile: mp 159-161 °. The Ή NMR spectrum indicated the sample contained both the E and Z geometrical isomers of the title compound in a ration of 27:73. AnaJ.

calculated for C₂₈H₂₂CIFN₂O_eS: C, 59.10; H, 3.90; N, 4.92. Found: C, 58.89; H, 3.71; 1 o

N, 4.72.

Example 17

6-Chloro-5-fluoro-2,3-dihydro-3-foctanovloxv-(2-thienv1)methvlene1-2-oxo-1 H-indole-1 carboxamide

The title compound was prepared by the procedure of Example 1 with the exception that octanoyl chloride (2 equiv.) was used and diisopropylethylamine was the base. The crude product was purified by flash chromatography on silica gel (eluting with CH₂CI₂) followed by recrystallization from acetonitrile: mp 149-150°. The ¹H NMR spectrum indicated the sample contained only the Z geometrical isomer of the title compound. Anal calcd for C₂₂H₂₂CIFN₂O₄S: C, 56.83; H, 4.77; N, 6.03. Found: C, 56.85; H, 4.49; N, 6.03.

Example 18

6-Chloro-5-fluoro-2,3-dihvdro-3-f3-(1-methvlpropyloxvcarbonvl)propenovloxv-2³θ thienyl)methylene1-2-oxo-1 H-indole-1 -carboxamide

a) 3-( 1 -Methylpropyloxycarbonyl)propenoyl chloride was prepared according to the procedure of Lutz (J. Am. Chem. Soc., 1930, 52, 3430).

b) The title compound was prepared by the procedure of Example 1 with the exception that 3-(1-methylpropyloxycarbonyl)propenoyl chloride (1.2 equiv.) and

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-16diisopropylethylamine were used. The crude product was purified by flash chromatography (eluting with CH₂CI₂) followed by recrystallization from acetonitrile: mp 180-186°. The Ή NMR spectrum indicated the sample contained both the E and Z geometrical isomers of the title compound in a ratio of 60:40. Anal, calcd for ⁵ C₂₂H,aCIFNjO_eS: C. 53.61; H, 3.68; N, 5.68. Found: C, 53.60; H, 3.57; N, 5.67.

Example 19

6-ChIoro-5-fluoro-2,3-dihvdro-3-f3-(methvloxvcarbonvl)propanoyloxv-(2thienyl)methylene1-2-oxo-1 H-indole-1-carboxamide 10 The title compound was prepared by the procedure of Example 1 with the exception that 3-(methyloxycarbonyl)propanoyl chloride (2 equiv.) and diisopropylethylamine were used. The crude product was purified by flash chromatography (eluting with 96:4 CH₂CI₂/MeOH) followed by recrystaSzation from toluene: mp 179-183°. The Ή NMR spectrum indicated the sample contained both the

E and Z geometrical isomers of the title compound in a ratio of 31:69. Anal, calcd for C₂₂H,₂CIFN_;O₆S: C, 54.27; H, 2.48; N, 5.75. Found: C, 53.80; H, 2.18; N, 5.71.

Example 20

6-Chloro-5-fluoro-2,3-dihvdro-343-{ethvloxvcarbonvi)propanovloxv-(2-thienvflmethvlene12Q 2-OXO-1 H-indole-1 -carboxamide

The title compound was prepared by the procedure of Example 1 with the exception that 3-(ethyloxycarbonyl)propanoyl chloride (2 equiv.) and diisopropylethylamine (2.2 equiv.) were used. The crude product was purified by flash chromatography (eluting with 97.5:2.5 CH₂CI₂/MeOH) followed by trituration with CH₂CI₂ 25 and recrystallization from acetonitrile: m; 182-183°. The Ή NMR spectrum indicated the sample contained only the E geometrical isomer of the title compound. Anal, calcd for C₂₀H,_eCIFN₂O₆S: C, 51.45; H, 3.45; N, 6.00. Found: C, 51.38; H, 3.27; N, 5.97.

Example 21 y>6-Chloro-5-fluoro-2.3-dihvdro-3-f3-(N.N-diethvlcarboxamidomethy0oxvcarbonyllpropanovloxy-te-thienvOmethylenel^-oxo-l H-indole-1-carboxamide a) A solution of succinic anhydride (16.0 g, 160 mmol) and benzyl alcohol (17.1 g, 158 mmol) in toluene (200 mL) was heated at reflux for 3.5 hr. At this time, the solvent was removed in vacuo to leave 3-(benzyloxycarbony1)propanoic acid as a white solid.

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-17b) A solution of 3-(benzyloxycarbonyl)propanoic add (15.0 g, 72 mmol), 2-chloroΝ,Ν-diethylacetamide (11.9 g, 79.5 mmol), triethylamine (11.2 mL, 80.4 mmol) and sodium iodide (1.1 g. 7.4 mmol) in ethyl acetate (280 mL) was heated at reflux tor 3 hr. The resulting mixture was filtered to remove triethylamine hydrochloride which was washed with more ethyl acetate. The filtrate was washed with 1N HCI solution, saturated NaHCO₃ solution and brine. After drying and filtering, the solvent was removed in vacuo to leave benzyl 3-[(N,N-diethylcarboxamidomethyl)oxycarbonyljpropanoate as a vixcous oil (22.2 g).

c) To a solution of benzyl 3-[(N,N-diethylcarboxamidomethyl)oxycarbonyl]propanoate (22.2 g, 62.9 mmol) in ethanol (250 mL) was added 10% palladium on carbon (1.0 g). The mixture was shaken under an atmosphere of hydrogen (3 atmospheres pressure) at 25° for 18 hr. After removal of the catalyst by filtration through diatomaceous earth, the solvent was evaporated to leave 3-[(N,N-diethylcarboxamidomethyl)oxycarbonyl]propanoic acid as a white solid (10.47 g).

d) A solution of 3-[(N,N-diethylcarboxamidomethyl)oxycarbonyl]propanoicacid (5.0 g, 21.6 mmol) and oxalyl chloride (2.0 mL, 23.5 mmol) in benzene (100 mL) was heated at reflux for 1 hr. The solvent was removed in vacuo to leave 3-[(N,Ndiethylcarboxamidomethyl)oxycarbonyl]propanoyl chloride as an oil.

e) The title compound was prepared by the procedure of Example 1 with the exception that 3-[(N,N-diethylcarboxamidomethyl)oxycarbonyl]propanoyl chloride (2.2 equiv.) and diisopropylethylamine (2.2 equiv.) were used. The crude product was purified by flash chromatography (eluting with CH₂CI₂ and then 97.5:2.5 CH₂Clj/MeOH) followed by trituration with 1:1 ether/CH₂CI₂ and recrystallization from toluene: mp 165167°. The Ή NMR spectrum indicated the sample contained only the E geometrical isomer of the title compound. Anal, calcd for C₂₄H₂₃CIFN₃O₇S: C, 52.22; H, 4.20; N, 7.61. Found: C, 52.17; H, 4.06; N, 7.50.

Example 22

5-Chloro-2.3-dihvdro-3-[3-carboxvpropenovloxv-(2-thienyf)methvlene1-2-oxo-lH-indole-1carboxamide

a) 3-(2-Trimethylsilylethyloxycarbonyl)propenoyl chloride was prepared according to a modification of the procedure of Lutz (J. Am. Chem. Soc„ 1930, 52, 3430) in which

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-18remaining furraryl chloride and unwanted diester are removed by distillation under vacuum leavirg the desired acid chkxide behind in the pot.

b) The trte compound was prepared by the procedure of Example 1 with the exception the 3-(2-trimethylsilylethytcxycarbonyt)propenoyl chloride (1.3 equiv.), 5chloro-2,3-dih/dro-3-[hydroxy-(2-thierr/1)methylene)-2-oxo-1 H-indole-1-carboxamidand «Sisopropylethyfamine were used. The crude product was purified by flash chromatograpny (using 98:2 CHjClj/EiOAc as eluant) followed by recrystallization from acetonitrile.

c) Hydrogen fluoride/pyridine complex (20 mt) was cooled in an ice bath in a polyethylene bottle. The 3-(2-trimethysilylethyloxycarbonyl)propenoyl derivative (0.89 g. 1.71 mmol) was then added. The resulting slurry was agitated in the cold for 0.5 hr. The reaction was then quenched by addition of H-0. The product was collected by fiftration, washing with H₂O and dried in vacuo. The yield was 0.60 g, mp 198-200°. The Ή NMR spectrum indicated the sample contained only the E geometrical isomer of the title compound. Anal, calcd for C₁₈H_nCIN₂O₆S: C, 51.62; H, 2.65; N, 6.69. Found: C. 51.18; H, 2.62; N, 6.51.

Example 23 e-Chloro-5-fluoro-2.3-dihvdro-3-f3-cart>cxpropenovloxv-(4-chloro-2-thienvl)methvlenel-2oxo-1 H-indole-1-carboxamide

a) 3-(2-Trmethylsilylethyloxycarbcnyl)propenoyt chloride was prepared according to a modification of the procedure of Lutz (J. Am. Chem. Soc., 1930, 52, 3430) in which remaining furraryl chloride and unwanted diester are removed by distillation under vacuum leaving the desired acid chloride behind in the pot.

b) The tit’e compound was prepared by the procedure of Example 1 with the exception tha£ 3-(2-trimethylsilylethylcxycarbonyl)propenoyl chloride (1.3 equiv.), 6chloro-5-fluoro-2,3-dihydro-3-[hydroxy-(/-chloro-2-thienyl)methylene]-2-oxo-1 H-indole-1 carboxamide and diisopropylethyl-amne were used. The crude product was purified by flash chromatography (using 60:40 hexane/EtOAc as eluant) followed by recrystallization from acetonitrile.

c) Hydrogen fluoride/pyridine complex (20 mL) was cooled in an ice bath in a polyethylene bottle. The 3-(2-trimethy5silylethyloxycarbonyl)propenoyl derivative (0.82 g, 1.43 mmol) was then added. The resulting slurry was agitated in the cold for 0.5 hr.

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-19The reaction was then quenched by addition of H₂O. The product was collected by filtration, washing with H₂O and dried in vacuo. The yield was 0.50 g, mp 158°. The Ή NMR spectrum indicated the sample contained only the E geometrical isomer of the title compound. Anal. Calcd for C₁₈H₉C1₂FN₂O₆S: C, 45.88; H, 1.92; N, 5.94. Found: C, 45.24; H, 1.98; N, 5.84.

1.

Example 24

6-Chloro-5-fluoro-2,3-dihvdro-3-fethoxvcarbonylmethoxyacetoxvmethoxv-(2thienyl)methylene1-2-oxo-1 H-indole-1 -carboxamide

a) A solution of diglycolic anhydride (12 g, 0.103 mol) and ethanol (4.74 g, 0.103 mol) in toluene (100 ml) was heated at reflux for 16 hr. The solution was cooled and evaporated and the residue distilled under reduced pressure. Tne product, monoethyl diglycolate (9.2 g, 55%), was collected over the range 109-135°C at 5 torr.

b) Solid NaHCO₃ (12.2 g, 0.145 mol) was added, in portions, to a solution of tetrabutylammonium bisulphate (24.6 g, 0.0725 mol) in water (250 ml), followed by a solution of monoethyl diglycolate (11.75 g, 0.0725 mol). The mixture was stirred for 16 hr. and then extracted with methylene chloride (3 x 500 ml). The combined organic extracts were dried, filtered and evaporated to leave the salt (21.1 g, 72%) which was used without further purification.

c) A solution of the tetrabutylammonium salt of monoethyl diglycolate (16 g, 0.04 mol) in methylene chloride (125 ml) was added to bromochloromethane (200 ml) over

1.5 hr. The resulting solution was stirred at room temperature overnight and then evaporated to dryness. The residue was chromatographed on silica eluting with ethyl acetate/hexane, 40/60 and the fractions containing product combined and evaporated to give ethyl dichloromethyl diglycolate (0.836 g, 10%) as a colorless oil. NMR analysis showed the material to be approximately 70% pure, but was used directly in the next step.

d) The chloromethyl ester (0.836 g, 3.98 mmol) from step c) was dissolved in acetone (10 ml) and then sodium iodide (1.8 g, 11.9 mmol) was added and the mixture stirred for 16 hr. at room temperature. The mixture was fitered and the filtrate evaporated to dryness, redissolved in methylene chloride (25 ml) and then washed with water (10 ml), sodium thiosulphate solution (10 ml), and saturated sodium chloride bad original &

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20solution (10 ml). The organic phase was separated, dried and evaporated to give crude ethyl iodomethyl ester diglycolate (1 g) which was used directly in the final step,

e) To a stirred suspension of sodio-6-chJoro-5-fluoro-2,3-dihydro-3-[oxy-(2-thienyl)methy1ene)-2-oxo-1 H-indole-1-carboxamide (1.2 g, 3.3 mmol) in acetone (30 ml) was added a solution of the iodomethyl ester from step d) in acetone (10 ml) over 5 minutes. The mixture was stirred for 16 hr. at room temperature. The resulting suspension was diluted with acetone until solution was obtained, silica (2 g) was added and the mixture evaporated to dryness. The resulting dry silica slurry was loaded onto a silica chromatography column and then eluted with ethyl acetate/hexane, 40/60. The fractions containing product were combined and evaporated to give the crude product which was recrystallized from ethanol to afford the title compound as a yellow crystalline solid (136 mg, mp 129-130°C).

Example 25

6-Chloro-5-fluoro-2.3-dihvdro-3-fbenzvloxvcarbonvlmethoxyacetoxvmethoxv-(2thienyhmethylenel^-oxo-l H-indole-1 -carboxamide

The title compound was prepared using the same methodology as Example 24 with the exception of using benzyl alcohol instead of ethanol in step a) to give monobenzyl diglycolate which was carried through the remaining procedures. The title compound was a yellow crystalline solid with a mp of 122°C

Example 26

6-Chloro-5-fluoro-2,3-dihvdro-3-f1-(benzyloxycarbonvlmethoxvacetoxv)ethoxv-(2thienyl)methylenel-2-oxo-1 H-indole-1 -carboxamide

a) To a solution of monobenzyl diglycolate (7.87 g, 0.035 mmol) in methylene chloride (75 ml) was added thionyl chloride (42 g, 0.35 mol) and the mixture stirred at room temperature for 72 hr. The mixture was evaporated to dryness and the crude acid chloride used directly in the next step.

b) To a mixture of the acid chloride (2.6 g, 0.011 mol) from step a) and a catalytic quantity of fused zinc chloride was added acetaldehyde (0.96 g, 0.022 mol) and the mixture stirred at room temperature for 2 hr. The mixture was then evaporated to dryness and the residue chromatographed on silica, eluting with ethyl acetate/hexane, 30/70. The fractions containing product were combined and evaporated to give a colorless oil (1.1 g, 35%).

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-2,·

c) To a stirred suspension ofsodio-6-chloro-5-fluoro-2,3-dihydro-3-[oxy-(2-thienyl)methy1ene)-2-oxo-1H-indole-1-carboxamide (0.95 g, 2.62 mmol) in acetone (20 ml) was added a solution of the chloroethyl ester from step b) in acetone (10 ml) over 5 minutes. Sodium iodide (0.13 g. 0.87 mmol) was then added and the mixture heated at reflux for 7 hr. The resulting suspension was cooled, diluted with acetone until solution was obtained, silica (2 g) was added and the mixture evaporated to dryness. The resulting dry silica slurry was loaded onto a silica chromatography column and then eluted with ethyl acetate/hexane, 40/60. The fractions containing product were combined and evaporated to give the crude product. Recrystallization from ether afforded the title compound as a yellow crystalline solid (20 mg, mp 89-91 °C).

Example 27

6-Chloro-5-fluoro-2,3-dihvdro-3-fbenzvloxvcarbonvlmethoxvacetoxv-(2-thienyl)methy1enel-2-oxo-1 H-indole-1 -carboxamide

To a cooled (0°C), stirred solution of 6-chloro-5-fluoro-2,3-dtiydro-3-[oxy-(2thienyl)-methylene)-2-oxo-1 H-indole-1-carboxamide (1 g, 3 mmol) and triethylamine (0.33 g, 3.3 mmol) in methylene chloride (10 ml) was added a solution of monobenzyl diglycolate acid chloride (0.79 g, 3.3 mmol) (see Example 26, step a) in methylene chloride (10 ml) over 5 minutes. The mixture was stirred at room temperature for 2 hr. and then absorbed on silica and chromatographed, eluting with methylene chloride/methanol, 15/1. Fractions containing product were combined and evaporated, and the crude product recrystallized from acetonitrile to afford the title compound as a yellow crystalline solid (40 mg, mp 189-190°C).

Example 28

6-Chloro-5-fluoro-2.3-dihvdro-3-fN,N-diethylcarbamovlmethoxvacetoxv-(2-thienvl)methy1enel-2-oxo-1 H-indole-1 -carboxamide

a) To a stirred solution of diglycolic anhydride (1 g, 8.6 mmol) in toluene (10 ml) was added diethylamine (0.628 g, 8.6 mmol) over 10 min. A mild exotherm resulted and the mixture was allowed to stir at room temperature for 16 hr. Evaporation of the solvent afforded the product as a colorless, viscous oil (1.7 g, 100%).

b) To a solution of Ν,Ν-diethylcarbamoylmethoxy acetic acid (1.5 g, 7.3 mmol) in methylene chloride (15 ml) was added thionyl chloride (8.7 g, 73 mmol, and the mixture

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-22stirred at room temperature for 16 hr. Evaporation of the solvent furnished the crude acid chloride which was used directly in the next step.

c) To a stirred solution of 6-chloro-5-fluoro-2,3-dihydro-3-[oxy-{2-thienyi)-methy1ene)5 2-oxo-1H-indole-2-carboxamide (2.7 g, 8.2 mmol) and triethylamine (1 g, 9.8 mmol) in methylene chloride (20 ml) was added a solution of N.N-diethylcarbamoylmethoxy acetyl chloride (1.7 g, 8.2 mmol) in methylene chloride (10 ml) over 5 minutes. The mixture wets stirred at room temperature for 72 hr. and then absorbed on silica and chromatographed, eluting with methylene chloride/methanol, 25/1. Fractions containing product were combined and evaporated, and the crude product recrystallized from acetone to afford the title compound as a yellow crystalline solid (126 mg, mp 205208°C).

Example 29

6-Chloro-5-fluoro-2_l3-dihydro-3-f(2-(1,1-dimethvlethoxv carbonvamino)propanovloxv)methoxv-(2-thienvl)methylene1-2-oxo-1 H-indole-1carboxamide

The tetrabutylammonium (TBA⁺) salt of N-t-BOC alanine (50 mmole) (prepared by titration with TBA* hydroxide in ethanol or by treatment with an equivalent of TBA+ HS0₄- and 2 equivalents NaHC0₃ in water and extraction with a chlorocarbon) was dissolved in BrCH₂CI (200 ml) and stirred for 48 hr. in the dark. The concentrated mixture was taken up in CHCI₃, washed with water, dried with MgSO₄, filtered and concentrated to an oil. This was chromatographed (CH₂CI₂) to give 6.25 g (52%) of N-tBOC alanine chloromethyl ester which contained a trace of the corresponding bromomethyl ester.

N-t-BOC Alanine chloromethyl ester (6.20 g, 26.1 mmole) and sodium iodide (19.5 g, 130 mmole) were combined in acetone (150 ml) and stirred at room temperature for 18 hr. The mixture was then filtered and the filtrate concentrated to an oil. This was taken up in EtOAc and washed with 10% sodium thiosulfate solution and water. Drying with MgSO₄, filtration and concentration yielded 7.40 g (86%) of N-t-BOC 30 alanine iodomethyl ester as an oil.

N-t-BOC alanine iodomethyl ester (7.30 g, 22.2 mmole) and the sodium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5-fluoro-2.3-dihydro-2-oxo-1 H-indole-1carboxamide (2.67 g, 7.4 mmole) were combined in acetone (75 ml) and refluxed for 6 hr. The reaction mixture was concentrated and the residue preabsorbed onto silica bad original £

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-23Combination and concentration of the appropriate fractions gave the crude product which was 'ecrystallized (EtOAc/hexane) to give 1.16 g (29%) of the title compound: mp 165-17G°C; Anal, calcd for C_;3H.₃CIFN₃O₇S: C, 51.16; H, 4.29; N, 7.78. Found:

C, 51.26. K 4.10; N, 7.70

Examples 30-40 were prepared by the procedure of Example 29.

The general structure of these compounds is

Physical properties and the vaiues of R are shown in the Table beiow.

Example Number	Starting Acid	mp	Calculated Found	R
			C	H	N
Example 30 C1BH14CIFN2O6S	O- trimethyl- silylethyl- lactic acid*	184- 187°C	49.04 49.19	3.20 2.97	6.35 6.33
Example 31 C25H20CIFN2O6S	O-benzyl lactic acid	108- 112°C	56.55 56.44	3.80 3.62	5.28 5.33
Example 32 C22H21CIFN3O5S	N-t-BOC glycine	171- 174°C	50.24 50.40	4.02 3.53	7.99 7.81
Example 33 C20H,6CIFN2O6S	tetrahydro furoic acid	184- 185°C	51.45 51.37	3.45 3.37	6.00 5.96

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Example 34 C19H16CIFN2OeS	O-methyl lactic acid	149- 151°C	50.17 50.21	3.55 3.36	6.16 6.17	0
Example 35 C27H24CIFN2O6S	O-benzyl 2-hydroxy- valeric acid	121- 123°C	58.01 57.91	4.33 4.00	5.01 4.99	JO
Example 36 C26H22CIFN2O6S	O-benzyl butyric acid	111- 113°	57.30 57.30	4.07 3.80	5.14 5.15
Example 37 C27H24CIFN2O6S	O-benzyl isovaleric acid	138- 142°C	58.01 58.06	4.33 4.11	5.01 5.02
Example 38 C24H18CIFN2O6S	O-benzyl glycolic acid	130- 131°C	55.76 55.85	3.51 3.48	5.42 5.38
Example 39 C18H14CIFN2OeS	O-methyl glycolic acid	144- 147°C	49.04 49.00	3.20 3.04	6.35 6.25	0
Example 40 C20H,8CIFN2O6S	O-methyl butyric acid	134- 135°C	51.23 51.52	3.87 3.96	5.97 5.83	0

*- A separate step for removing the SEM group was not necessary as it deaved during the final step of the reaction sequence.

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-25Example 41 General Procedures

N-t-BOC Protected amino acid derivatives of 3-[hydroxy-(2-thienyl)methylene]-6-chloro5 5-fluoro-2,3-dihydro-2-oxo-1H-indole-1-carboxamide were converted to the corresponding deprotected compounds by two methods:

Method A: The N-t-BOC protected amino acid derivative was dissolved in chilled (icewater bath) TFA (0.1 M) and allowed to stir at that temperature for 1 hr. One equivalent of p-TsOH*H₂O was added to this solution and then the TFA was removed in vacuo.

After chasing with toluene (2X) to further remove TFA, the residual solid was recrystallized from CH₃OH/EtOAc to give the desired deprotected compound.

Method B: The N-t-BOC protected amino acid derivative was dissolved in 2/1 dioxane/EtOAc (0.1 M) and this solution saturated with HCI gas while keeping the temperature below 10°C. After 3 hr. the precipitated product was collected, washed with EtOAc and recrystallized from EtOAc/EtOH to give the desired deprotected compound.

Examples 42-45-5 were prepared by method A or B of Example 41.

Example Number	Method	mp	Calculated Found	R
			C	H	N
Example 42 C. JH,3CIFN3O5S •C-H8O3S GLy	A	210- 211°C	48.20 48.19	3.51 3.56	7.03 6.85
Example 43 C1cH,5CIFN3O5S •C-H8O3S L-Aia	A	210- 214°C	49.06 48.95	3.79 3.67	6.87 6.84	N H 2
Example 44 C24H19CIFN3O5S •C-H8O3S L-Phe	A	150°C dec.	54.10 53.85	3.96 3.97	6.11 5.95	nh2

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Example 45 C21H22CIFN4O5S •2HCI*H2O L-Lys	E	135°C dec.	42.98 42.69	4.29 4.62	9.55 9.49	NMe
Example 45-1 c2Oh19cifn3o5s •c7h8o3s L-Val	A	168- 173°C	50.66 50.44	4.25 4.36	6.56 6.24
Example 45-2 C2,H2,CIFN3O5S •c7h8o3s L-Leu	A	210- 211°C	51.41 51.52	4.47 4.73	6.42 6.04
Example 45-3 c,9h15cifn3o7s • HCI*0.4C4H8O2 L-Asp	B	105dc c	44.94 44.50	3.54 3.91	7.25 6.86	^co2h
Example 45-4 c2Oh19cifn3o5s 2· c7h8o3s L-Met	A	190- 196°	48.24 48.15	4.05 3.90	6.25 5.85
i Example 45-5 c,8h,5cifn3o5s • ' c7h803s D-Ala	A	202- 205 dec	49.06 48.82	3.79 3.58	6.87 6.79

Example 45

5-Chloro-5-fluoro-2.3-dihvdro-3-vl)f(1-(4-phenvlmethoxvcarbonvlbenzovloxy)-1-ethvtoxv2-thienvl)methylene1-2-oxo-1H-indole-1-carboxamide

Zinc chloride (524 mg) was fused in vacuo and, after cooling, treated with 4benzyloxycarbonyl)benzoyl chloride (21.48 g, 78.2 mmole). After 30 min., acetaldehyde (3.44 g, 78 mmole) was added at 0°C. The reaction mixture was stirred at room temperature for 30 min. and then diluted with CH₂CI₂. The mixture was stirred for another 30 min. and then washed with water (3X). After drying with MgS0_4l iltration, and concentration in vacuo, a green/brown solid was obtained that was

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-27chromatographed (25:75 - CH₂CI₂:hexane) to give 7.65 (31%) of 1-chloroethyl 4(benzyloxycarbonyl)benzoate as a white solid: mp 79-82°C; Anai. calcd for Ο,,Η^ΟΙΟ*: C, 64.06; H. 4.74. Found: C, 63.88; H, 4.44. This chloroethyl ester (4.00 g, 12.5 mmole) was combined with the sodium salt of 3-[hydroxy-(2-thienyl)methy1ene]-6-chloro5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1 -carboxamide (4.51 g, 12.5 mmole) and sodium iodide (644 mg, 4.3 mmole) in acetone (40 ml) and refluxed for 12 hr. The reaction mixture was filtered and the filtrate concentrated in vacuo. The orange/brown gum was chromatographed (25:75 - EtOAc: hexane, then 1:99 - EtOAc:CH₂CI₂) to give 1.947 g (25%) of an orange foam: Anal, calcd. for C₃₁H₂₂CIFN₂O₇S*2/3 H₂O: C, 58.81; H, 3.72; N, 4.43. Found: C, 58.74; H, 3.38; N, 4.38.

Example 47 was prepared by the same sequence of reactions:

Example Number	Starting Acid Chloride	mp	Calculated Found	R
			C	H	N
Example 47 c31h22cifn2o7s	3-(benzyloxy- carbonyl)- benzoyll chloride	185- 188°C	59.95 59.79	3.57 3.46	4.51 4.45
	Example c	19

3-f[[(5-benzyloxv)qlutarvl]methvlene1oxv-(2-thienvl)methylene)-6-chloro-5-fluoro-2,3dihydro-2-oxo-1 H-indole-1 -carboxamide

A mixture of 114 g (0.24 mol) of tetrabutylammonium benzylglutarate (A. R.

English, D. Girard, V.J. Jasys, R. J. Martingano, and M. S. Kellogg, J. Med. Chem., 1990, 33, 344), and 600 ml of bromochloromethane was stirred at 0°C in an ice bath with slow warming to room temperature over 16 hr. The excess bromochloromethane was removed in vacuo and the residue was dissolved in EtOAc, washed successively with aqueous 1N hydrochloric acid solution (2s 1L) and satd. aqueous sodium bicarbonate solution (1x2L), dried over sodium sulfate, and evaporated to 35 g of an oil. A mixture of the oil, 55.2 g (0.368 mol) of sodium iodide, and 150 ml of acetone was stirred overnight at room temperature. The residue was partitioned between EtOAc (500 ml) and water (500 ml). The organic layer was separated, washed with satd. aqueous sodium thiosulfate solution (2 x 500 ml), dried over sodium sulfate, and evaporated to give 34.7 g of a yellow oil which was purified by flash chromatography

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-28with an EtOAc-hexane (4:6) eluant to provide 10.7 g (32%) of [[5(benzyloxy)glutaryl]oxy]methyl iodide as an oi (R, 0.55, EtOAc-hexane (1:1)). Ή NMR (CDCI₃) 3 1.92-2.20 (2H, m), 2.41 (2H, t, J=7), 2.45 (2H, t, J=7), 5.16 is, 2H), 5.88 (2H, s), 7.30-7.40 (5H, m).

A mixture of 20.0 g (0.059 mol) of 3-[hydroxy-(2-thienyl)methyfene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide, 590 ml (0.059 moi) of aqueous 1N sodium hydroxide solution, and 300 ml of methanol was concentrated in vacuo. The residue was washed well with ether to provide 20.5 g (95%) of the orange-yellow sodium salt.

A suspension of 10.1 g (0.028 mol) of the salt above, 10.0 g (0.028 mol) of [[5(benzyloxy)glutaryl]oxy]methyl iodide, and 300 ml of the acetone was stirred for 16 hr. at room temperature. The mixture became homogeneous and was concentrated in vacuo, and the residue was partitioned between 350 ml of EtOAc and 350 ml of satd. aqueous sodium thiosulfate solution. The organic layer was separated, washed again with 350 ml of satd. aqueous sodium thiosulfate solution, dried over sodium sulfate, and concentrated in vacuo. Purification of the 15.6 g of the residual yellow solid by flash chromatography with an EtOAc-hexane (3:7) eluant provided 1.8 g (11%) of the title compound as a yellow solid (R, 0.3, EtOAc-hexane (1:1). Ή NMR (CDCI₃) 3 1.902.06 (2H, m), 2.32-2.56 (4H, m). 5.12 (2H, s), 5.54 (1H, bd s), 5.72 (2H, s), 7.24-7.27 (1H, m), 7.28-7.41 (5H, m), 7.50-7.53 (1H, m), 7.75-7.78 (2H, m), 8.37-8.41 (2H, m).

Example 50

6-Chloro-5-fluoro-3-ff(qlutaryl)methvlene1oxv-(24hienvl)methvlenel-e-chioro-5-fluoro-2.3dihydro-2-oxo-1 H-indole-1 -carboxamide

A solution of 1.75 g of 3-[{{5-benzyloxy)glutary1)methylene]oxy-(2thienyl)methylene]-6-chloro-5-fluoro-2,3-dihydro-2-oxo-1 H-indole-1 -carboxamide in 200 ml of EtOAc was hydrogenated at 45 psi in the presence of 900 mg Ρ<χθΗ)₂ for 2.5 hr. An additional 900 mg of catalyst was added folowed by another 900 mg several hours later. Hydrogenation then was continued overnight. The catalyst was filtered and the filtrate was concentrated in vacuo to 2.2 g of an orange semi-solid. Purification by flash chromatography with a methanol-chloroform (2-98 to 10-90) eluant was performed, and the fractions containing the material with R, 0.3 (methanol-chloroform, 1:9) were pooled and concentrated. The residue was triturated with ether to provide 66 mg (4%) of the title compound as a yellow solid, mp 184-186°C. ¹H NMR (DMSO-d₆) 3 1.62-1.80 (2H,

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-29m), 2.20 (2H, t. J=7), 2.40 (2H. t, J=7), 5.75 (2H, s), 7.30 (1H, t, J=3), 7.65 (1H, d, J = 2), 7.76-7.85 (2H, m), 7.95 (IH, s), 8.05 (1H, d, J=3), 8.25 (1H, d, J=7), 8.32 (1H, s). MS (m/e) 337 and 339, 295 and 297, 211 and 213 (base).

Example 51 e-Chloro-S-fluoro-g.S-dihvdro-e-Ite-furovUoxv-^-thienvDmethylenel^-oxo-l H-indole-1 carboxamide

To a stirred suspension of (Z)- 6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1H indole-1-carboxamide sodium salt (1.4 gm., 3.88 mmole) and sodium iodide (20 mg, 0.12 mmole) in 30 ml of dichloromethane was added 2furoyl chloride (380 mg, 3.88 mmole). The resulting suspension was then stirred for 20 hr. at room temperature. The reaction suspension was filtered and washed with dichloromethane to remove unreacted 6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1 H indole-1-carboxamide sodium salt. The filtrate was evaporated in vacuo to an orange solid which was chromatographed on a silica gel column (100 gm. silica gel) and eluted with dichloromethane to yield the crude titled compound as a solid. The solid was crystallized from dichloromethane and hexane to yield a yellow solid, 210 mg (12.6%): mp 215-216°C. Anal, calcd. for C,_sH,₀CIFN₂O₅S: C, 52.73; H, 2.33: N, 6.47. Found: C, 52,66; H, 2.21; N, 6.46.

Example 52

6-Chloro-5-fluoro-2.3-dihvdro-3-Kacetoxvacetovl)oxv-(2-thienyl)methvlenel-2-oxo-1 Hindole-2-carboxamide

To a stirred suspension of (Z)-6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1 H indole-1 -carboxamide sodium salt (2.0 gm., 5.6 mmole) and sodium iodide (200 mg, 1.33 mmole) in 25 ml of acetone was added acetoxyacetyl chloride (770 mg, 5.6 mmole) and the mixture was heated to reflux for 18 hr. The suspension was cooled to room temperature and filtered to remove unreacted 6chloro-5-fluoro-2.3-dihydro-3-(hydroxymethylene)-2-oxo-1H indole-2-carboxamide sodium salt. The filtrate was evaporated in vacuo to a yellow solid which was chromatographed on a silica gel column (silica gel, 75 gm) and eluted with hexane and ethyl acetate (9:1) to yield the crude titled compound as a solid, which was crystallized from acetonitrile to yield a yellow solid, 500 mg (20%): mp 188-189°C. Anal, calcd. for C,₈H₁₂CIFN₂O_sS: C, 49.27; H, 2.76; N, 6.38. Found: C, 49.14; H, 2.54; N, 6.17.

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-30Example 53

5-Chloro-5-fluoro-2,3-dihvdro-3-f(methcxvacetovl)oxv-(2-thienvl)methylenel-2-oxo-1 Hndole-1 -carboxamide

The title compound was prepared using methoxyacetyl chloride using the procedure described in Example 52 with the exception that the crude product was purified by chromatography (florasil) and eluted with ethyl acetate. Crystallization from acetonitrile gave a yellow solid, 550 mg (24.2%); mp 199-200.5°C Anal, calcd. for C,₇H₁₂CIFN₂O₅S: C, 49.70; H, 2.94; N, 6.82. Found: C, 49.51, H, 2.66; n, 6.92.

Example 54

5-Ch loro-5-fluoro-2,3-d i hydro-3-ftrans-(2-tri methyl silyethyl oxycarbonyl )-2cyclobutanovl)cxv-(2-thienvl)methylene]-2-oxo-1 H-indole-1-carboxamide

To a stirred solution of 6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2liienylmethylene)-2-oxo-1 H-indole-1-carboxamide (14.1 gm, 0.0416 mmole) in 120 ml of dichloromethane and diisopropylethylamine (6.89 gm, 0.053 mole) was added trans1-(2-trimethylsilyiethyloxycarbonyl)2-cydobutylcarbonyl chloride (14.0gm, 0.053 mole). After stirring for 18 hr. at room temperature and filtering the solid that formed, the filtrate was evaporated in vacuo to a yellow scxid. The solid was chromatographed on a silica gel column and eluted with hexane and ethyl acetate (3:1) to yield a crude solid, crystallization from acetone gave a yefiow solid 1.0 g (4.3%): mp 183-184°C. Anal, calcd. for C₂₅H_2fCIFN₂O₆SSi: C, 53.14: H, 4.64; N, 4.96; Found: C, 53.08; H, 4.45; N, 4.86.

Example 55

5- Chloro-5-fluoro-2,3-dihydro-3-ftrans-142-trimethvlsilvlethvloxvcarfaonvl)-2-(cvclopropanoyl)oxv-(2-thienyl)methvlene12-oxo-1 H-indole-1 -carboxamide Z isomer

The title compound was prepared using appropriate starting materials by the procedure of Example 54, with the exception that it was separated on a silica gel pad and eluted with hexane and ethyl acetate (4:1) to give the crude product. Crystallization from chloroform and hexanes gave a yellow solid, 140 mg (3.7%); mp 181-182°C. Anal. Calcd. for C₂₄H₂₄CIFN₂O_eSSi: C, 52.31; H, 4.39; N, 5.08. Found: C, 52.32; H, 4.36: N, 5.12.

Example 56

6- Chloro-5-fluoro-2,3-dihvdro-3-ftrans-1-(2-trimethvlsilylethvloxvcarbonvl)-2-(cvclopropanovl)oxv-2-thienvl)methylene1-2-oxo-1 H-indole-1-carboxamine E isomer

The title compound was prepared using appropriate starting materials by the procedure of Example 54. Crystallization from chloroform and hexanes gave a yellow

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-31solid, 160 mg (4.2%); mp 1775-176. Anal, calcd. for C._IH₂₄CIFN₂O₆SSi: C, 52.31; H, 4.39; N, 5.08. Found: C. 52z.45; H, 4.28; N. 4.92.

Example 57

6-Chloro-5-fluoro-2,3-dihvdrc-/-3[(cvclopentanoyl)oxv-(2-thienvl)methylenel-2-oxo-1Hindole-1 -carboxamide

The title compound wwas prepared using appropriate starting materials by the procedure of Example 54. with the exception of the elution of the silica gel chromatography with hexaHnes and ethyl acetate (7:3) to give a crude solid. Crystallization from acetone- and hexanes gave a yeftow solid, 260 mg (3.3%); mp 194°C dec. Anal, calcd. fcr · C-,FL_sCIFN₂O₄S: C, 55.24: H, 3.71; N, 6.44. Found: C, 55.31; H, 3.47; N, 6.37.

Example 58

6-Chloro-5-fluoro-2,3-dihydr--'-3f(2.2,3,3-tetramethvlcYclooropanovl)oxv-(2-thienvl)rnethvlene)-2-oxo-1 H-indole-1 -carcooxamide 15

The title compound ..was prepared using appropriate starting materials by the procedure of Example 54 wnrtn the exception of purification by silica gel pad and elution with hexane and ethyl acetaiee (7:3) to give a crude solid. Crystallization from acetone gave a yellow solid 230 mg (2.5%): mp 202°. Anal, calcd. for C₂₂H_2OCIFN₂O₄S: C,

57.08; H, 4.35; N, 6.05. Fecund: C, 57.02; H, 4.36; N, 5.87. on

Example 59 {1-f(1-Carbamoyl-6-chloro-5—fluoro-2-oxo-1,2-dihvdro-hdol-3-vlidene)-thiophen-2-vlmethoxvl-ethoxycarbonyloxv >-acetic acid methyl ester

The tetrabutylammcrnium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2.3-dihydro-2-oxo-1F—mdole-l-carboxamide (2.98 g) and methyl (125 iodoethoxyjcarbonyloxyaceiaate (2.18 g) were combined in acetone, and the solution stirred for 20 hr. at 20°C. Scolvent was evaporated in vacuo, and the residue extracted with ethyl ether. The ether solution was evaporated in vacuo, to leave a partially crystallized residual oil upon' standing. After filtering off the remaining oil, residual solids were slurried in a srraall amount of ethyl ether and filtered to give 495 mg of yellow solid. An additional 2295 mg of comparable quality title product was obtained by chromatography on silica get (elution with chloroform witn 2% acetone) of the combined ether soluble residues. The :. product was identified by NMR. NMR data for Examples 59-70 are shown in the Tablee following Example 70.

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-32Example 60 (1 -f( 1 -Carbamoyl-6-chloro-5-fluoro-2-oxo-1,2-dihydro-i^dol-3-ylidene)-thiophen-2-vlmethoxvl-ethoxycarbonyloxv)-N.N-dimethvlacetamide

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fiuoro-2,3-dihydro-2-oxo-1H-indole-1-carboxamide (6.25 g) and N, N-dimethyl-(1iodoethoxy)carbonyloxyacetamide (5.55 g) were combined in 60 mL of acetone, and the solution stirred for 90 hr. at 20°C. The precipitate present was removed by filtration and dried in vacuo. The solids were chromatographed on silica gel, eluting with 90:10 chloroform:acetone. Fractions containing the title product were combined and evaporated. The residue was slurried with a small amount of ethyl ether and filtered to give 820 mg of yellow solid, mp 1S4.5-195.5°C.

Example 61 {1 -[1 -Carbamoyl-6-chloro-5-fluoro-2-oxo-1.2-dihvdro-indol-3-vlidene)-thiophen-2-ylmethoxvl-ethoxycarbonvloxv}-N,N-diethylacetamide

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide (13.85 g) and N.N-diethyl-(1iodoethyoxy)carbonyloxyacetamide (13.6 g) were combined in 100 mL of acetone, and the solution stirred for 42 hr. at 20°C. Insolubles were removed by filtration, and stirred with chloroform. Remaining solids were filtered off, and the chloroform solution evaporated in vacuo. The residue was chromatographed on silica gel, with 90:10 chloroform:acetone elution. Fractions containing the desired material were combined and evaporated. The residue was slurried with a small amount of ethyl ether and filtered to give 2.37 g of yellow solid, mp 172-174°C.

Example 62 (1 -f1 -CarbamoYl-6-chloro-5-fluoro-2-oxo-1,2-dihydro-irdol-3-vlidene)-thiophen-2-ylmethoxyl-methyl) ester of Ν,Ν-dimethylsuccinamic acid

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihyaro-2-oxo-1H-indole-1-carboxamide (6.65 g) and iodomethyl N,Ndimethylsuccinamate (3.27 g) were combined in 100 mL of acetone, and the solution stirred for 65 hr. at 20°C. After evaporation of the solvent in vacuo, the residue was extracted 3 times with chloroform. The chloroform extracts were combined and evaporated in vacuo. The residue was chromatographed on silica gel eluted with 75:25

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-33chloroform:acetone. Fractions rich in the title product were combined and evaporated to give 189 mg of orange oil. Other fractions containing the title product were combined, evaporated, and rechromatographed on silica gel with 90:10 chloroform:acetone. Fractions rich in title product were combined with the 189 mg of oil indicated above and evaporated to give 490 mg of an orange solid. This solid was slurried in a small amount af ethyl ether, and filtered to give 180 mg of orange solid melting at 183-187°C.

Example 63 {f (1 -Carbamovl-6-chloro-0-f1uoro-2-oxo-1.2-dihydro-indol-3-vlidene)-thiophen-2-vlmethoxvl-methyl} ester of h N-diethylsuccinamic acid

The tetrabutylammcnium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 F-ndole-1 -carboxamide (4.36 g) and iodomethyl N,Ndiethylsuccinamate (2.36 c were combined in 30 mL of acetone, and the solution stirred for 87 hr. at 20°C. After evaporation of the solvent in vacuo, the residue was chromatographed on silica gel with 90:10 chlorofomracetone elution. Fractions containing the title product were combined and concentrated to an oil containing some solids. Ethyl ether was added to the oily solids, and insolubles filtered off. (The solids contained both TBA iodide and C-alkylated product.) The ether filtrate was evaporated, and the residue chromatog-aphed on silica gel with 90:10 chloroform:acetone elution. Fractions rich in title produc were combined and evaporated in vacuo to an orange oil. The oil was dissolved in et-yl ether and allowed to stand overnight. A precipitate of yellow solids was removed oy filtration and dried in vacuo to give 265 mg, melting at

151-152.5°C.

Example 64 {f(1-Carbamovl-6-chloro-f-f1uoro-2-oxo-1,2-dihydro-indol-3-vlidene)-thiophen-2-vlmethoxvl-methyl) ester of N N-dipropylsuccinamic acid

The tetrabutylammcnium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5³⁰ fluoro-2,3-dihydro-2-oxo-1K-ndole-1 -carboxamide (6.07 g) and iodomethyl N,Ndipropylsuccinamate (2.6 c were combined in 50 ml of acetone, and the solution stirred tor 18 hr. at 20°C. T!-e solvent was evaporated in vacuo, and the residue stirred with ethyl ether. A preciptate formed, and was removed by filtration. The ether solution was evaporated n vacuo to give 6.5 g of orange oil. The oil was

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-34chromatographed on silica gel with 95:5 chlorofomn:acetone elution. Fractions rich in the title product were combined and concentrated in vacuo. Ethyl ether was added to the residue and the solution was allowed to stand. The yellow precipitate which formed was filtered off to give 210 mg. Other fractions that contained the title product were combined and evaporated, and the residue chromatographed on silica gel with 50:50 ethyl acetate:hexane elution. Fractions rich in the title product were combined and concentrated to an oil, which was dissolved in ethyl ether and allowed to stand for 18 hr. The yellow precipitate which formed was filtered off to give an additional 220 mg, mp 131.5-133.5°C.

Example 65 f }(1-Carbamoyl-6-chloro-S-fluoro-2-oxo-1.2-dihydro-indol-3-vlidene)-thiophen-2-ylmethoxvl-methyl) ester of N.N-hexamethylenesuccinamic acid

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide (4.4 g) and iodomethyl 4homopiperidino-4-oxobutyrate (11.98 g) were combined in 30 mL of acetone, and the solution stirred for 17 hr. at 20°C. The mixture was filtered, and the filtrate concentrated in vacuo. The residue was chromatographed on silica gel with 93:7 chloroform:acetone elution. Fractions rich in title product were combined and concentrated to an orange oil. This oil was chromatographed on silica gel using the same elution solvent. Fraction rich in the title product were combined and evaporated. Ethyl ether was added to the residue and the solution allowed to stand. The yellow precipitate which formed was removed by filtration to give 250 mg of material, mp 149151°C.

Example 66 {[(1 -Carbamoyl-6-chloro-5-fluoro-2-oxo-1,2-dihvdro-indol-3-ylidene)-thiophen-2-vlmethoxyl-methyl) ester of N.N-dimethylcarbamovloxyacetic acid

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide (3.28 g) and iodomethyl N,Ndimethylaminocarbonyloxyacetate (1.18 g) were combined in 15 mL of acetone and the solution stirred for 17 hr. at 20°C. The mixture was filtered, and the filtrate concentrated in vacuo. The residue was chromatographed on silica gel with 95:5 chloroform:acetone elution. Fractions rich in title product were combined and

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-35concentrated to a yellow oil. Ethyl ether was added to the oil, and the solution allowed to stand. A yellow precipitate formed was removed by filtration and dried to give 240 mg, mp 185.5-187°C.

Example 67 (f(1-Carbamoyl-6-chloro-5-fluoro-2-3xo-1,2-dihydro-indol-3-vlidene)-thiophen-2-vlmethoxyl-methyl) ester of Ν,Ν-diethylcarbamovloxvacetic acid

The tetrabutylammonium sail of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide (11.66 g) and iodomethyi N,Ndiethylaminocarbonyloxyacetate (6.36 g) were combined in 100 mL of acetone, and the mixture stirred for 17 hr. at 20°C. After filtration, the filtrate was concentrated in vacuo to a semi-solid. Ethyl ether was addei. and the ether insolubles filtered off. The ether solution was allowed to stand for several hours. The white precipitate which formed was filtered off (C-alkylated product). Upon further standing, the ether filtrate deposited a precipitate of yellow solids. The yelow solid was filtered and dried to give 990 mg of crystals melting at 156.8-157.8°C.

Example 68 (f(1 -Carbamovl-6-chloro-5-fluoro-2-cxo-1,2-dihvdro-indol-3-vlidene)-thiophen-2-ylmethoxyl-methyl) ester of N-pivaloyloycine

The tetrabutylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-2-oxo-1 H-indole-1-carboxamide (2.80 g) and iodomethyi Npivaloylglycinate (1.45 g) were combined in 20 mL of acetone, and the mixture stirred for 17 hr. at 20° C. After evaporation cf the solvent in vacuo, the yellow-orange residue was slurried with ethyl ether and filte'ed. The ether filtrate was evaporated, and the residue stirred with a small amount of ethyl ether. An insoluble precipitate was removed by filtration, and dissolved ir ethyl acetate for chromatography on silica gel with ethyl acetate elution. Fractions containing the title product were combined, and evaporated to a yellow solid. This soid was slurried in a small amount of ethyl ether and filtered to give 140 mg, mp 200-234°C.

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-36Example 69 {f(1 -Carbamoyl-6—chloro-5-fluoro-2-oxo-1,2-dihvdro-indol-3-ylidene)-thiophen-2-vlmethoxyl-methyl} -tester of N-(2-ethylbutvry1)qlvcine

The tetrabumylammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chloro-5fluoro-2,3-dihydro-22-oxo-1 H-indole-1 -carboxamide (5.13 g) and iodomethyl N-(2-ethylbutyryl)glycinate (2..78 g) were combined in 35 mL of acetone, and the mixture stirred for 17 hr. at 20°C. After evaporation of the solvent in vacuo, the orange residue was slurried with ethyl eether and filtered. The ether filtrate was evaporated, and the residue stirred with a small. amount of ethyl ether. A yellow precipitate (200 mg) was removed by filtration, and disssotved in ethyl acetate for chromatography on silica gel with ethyl acetate elution. Frasctions containing the ttle product were combined, and evaporated to give 40 mg of .yellow solid. An additional 256 mg of the same title product was obtained by chromnatography of the initial acetone insoluble fraction on silica gel with ethyl acetate eluticrr.

Example 70 {1-[(1-Carbamoyl-6—chloro-5-fluoro-2-oxo-1.2-dihvdro-indol-3-ylidene)-thiophen-2-vlmethoxyl-ethyl) esraer of isopropylcarbonic acid

The tetrabuLnyiammonium salt of 3-[hydroxy-(2-thienyl)methylene]-6-chtoro-5fluoro-2,3-dihydro-Z- -oxo-1 H-indole-1 -carboxamide (13.62 g) and 1-iodoethyl isopropyl carbonate' (6.08 g; were combined in 90 mL of acetone, and the mixture stirred for 17 hr. at 20°C. Insco.ubles were filtered of. slurried in chloroform, and filtered. The chloroform filtrate was combined with the acetone soluble reaction fraction, and solvents evaporateeo in vacuo. The resicue was chromatographed on silica gel with 98:2 chloroform:aceetone elution. Fractions containing the title product were combined, and evaporated tc ggtve an orange oil. Ethyl ether was added with stirring, and a yellow solid crystallized clu: Filtration and drying gave 1.10 g, mp 183-184°C.

'Wan-Joo Kim, et al.. The Journal of Antibiotics, (1991), 44. 1086.

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-37NMR Cuata for Compounds of Examples 59 - 70

R¹ 0,

Example No.	R1	R2	Ή NMR Data (CDCI3)
59	Me	CCCH2CO-Me	1.75 (d, 3H); 3.68 (s, 3H); 4.54 (s, 2H); 5.15 (br. s, 1H); 6.22 (q, 1H); 7.22 (dd, 1H); 7.52 (dd, 1H); 7.68 (dd,1H); 7.77 (d, 1H); 8.36 (d, 1H); 8.38 (br. s, 1H).
60	Me	COCH2CONMe2	1.75 (d, 3H); 2.86 (s, 3H); 2.90 (s, 3H); 4.62 (ABq, 2H); 5.14 (br. s. 1H); 6.22 (q, 1H); 7.20 (dd, 1H); 7.54 (dd, 1H); 7.66 (dd, 1H); 7.78 (d, 1H); 8.34 (d, 1H); 8.38 (br. s, 1H).

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61	Me	OCH2CONEtj	1.11 (t, 3H); 228 (t, 3H); 1.78 (d, 3H); 3.16 (q, 2H); 3 35 (m, 2H); 4.66 (ABq, 2H); 5.18 (br. s. 1H); 6.26 (q, 1H); 7.23 (dd, 1H); 7.58 .’dd, 1H); 7.70 (dd, 1H); 7.82 (d, 1H); 8.38 (d, 1H); 8.42 (br. s 1H).
62	H	CH2CH2CONMe2	2.63 (m, 4H); 2.90 (s, 3H); 3.00 (s, 3H); 5.16 (br. s, 1H); 5.74 (s, 2H); 7.26 (dd, 1H); 7.54 (dd, 1H); 7.73 (dd, 1H); 7.78 (d, 1H); 8.40 (d, 1H); 8.45 (br. s, 1H).
63	H	CH2CH2CONEt2	1.04 (t, 3H); 1.16 (t, 3H); 2.62 (m, 4H); 3.28 (m, 4H); £22 (br.s, 1H); 5.70 (s, 2H); 7.22 (dd, 1H); 7.50 (dd, 1H); 7.69 (dd, 1H); 7.74'd, 1H); 8.34 (d, 1H); 8.37 (br. s, 1H .
64	H	CH2CH2CONPr2	0.80 (t, 3H): 0.88 (t, 3H); 1.44 (m, 2H); 1.56 (m, 2H); 2.60 (m, 4H); 3.16 (q, 4H); 5.15 (br. s. 1H); 5.69 (s, 2H); 7.20 (dd, 1H); 7.46 >dd, 1H); 7.68 (dd, 1H); 7.74 (d, 1H); 8.34 (d, 1H); 8.38 (br. s, 1H).
65	H	(CH2)2CON(CH2) e	1.44-1.74 (m, 6H); 2.60 (m, 4H); 3.32- I 3.46 (m, 4H); £.22 (br. s, 1H); 5.70 (s, 2H); 7.20 (dd, 1H); 7.47 (dd, 1H); 7.68 (dd, 1H); 7.73 d, 1H); 8.34 (d, 1H); 8.36 (br. s, 1H .
66	H	CH2OCONMe2	2.86 (s, 3H); 2 90 (s, 3H); 4.56 (s, 2H); 5.14 (br. s, 1H: 5.74 (s, 2H); 7.20 (dd, 1H); 7.45 (dd, rh); 7.68(dd, 1h); 7.72 (d, 1H); 8.33 (tr. s, 1H); 8.34 (d, 1H).
67	H	CH2OCONEt2	1.08 (t, 3H): 1.11 (t, 3H); 3.26 (q, 4H); 4.59 (s, 2H); 524 (br. s, 1H); 5.74 (s, 2H); 7.20 (dd, 1H); 7.44 (dd, 1H); 7.68 (dd, 1H); 7.72 d, 1H); 8.32 (br. s, 1H); 8.34 (d,1H).
68	H	CH2NHCOCMe3	1.20 (s, 9H); 4 34 (d, 2H); 5.15 (br. s, 1H); 5.75 (s, 2H); 6.08 (br. s, 1H); 7.27 (dd, 1H); 7.50 dd, 1H); 7.75 (m, 2H); 8.40 (br. s, 1H: 8.42 (d, 1H).
69	H	CH2NHCOCHEt2	0.88 (t, 6H); 1.43-1.68 (m, 4H); 1.05 (m, 1H); 4.08 (d, 2H); 5.18 (br. s, 1H); 5.77 (s, 2H); 5.88 (br. s, 1H); 7.27 (dd, 1H); 7.50 (dd, 1H); 7.75 (m, 2H); 8.39 (br. s, 1H); 8.41 (d, 1H).

BAD ORIGINAL ft

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70

Me

0CHMe2

1.13 (d, 3H); 1.35 (d, 3H); 1.74 (d, 3H); 4.74 (m, 1H); 5.20 (br. s, 1H); 6.18 (q, 1H); 7.24 (dd, 1H); 7.56 (dd, 1H); 7.72 (dd, 1H); 7.80 (d, 1h); 8.40 (d, 1H); 8.45 (br. s, 1H).

Example 71

6-Chloro-5-fluoro-2,3-dihydro-3-[1-(1-(me<hoxvacetoxv)-ethoxv-(2-thienvl)methvlene1oxo1 H-indole-1 -carboxamide

a) To a mixture of methoxyacetyl chloride (10.0 g, 0.092 mole) and a catalytic quantity of fused zinc chloride was added, cooled the solution to (-20°C) and added the acetaldehyde (4.06 g, 0.092 mole). Removed cooling and stirred for 1 hr at room temperature. Distilled at 30 torr and collected fractions coming over at 50-80°C to yield an oil 3.3 g (22.9%).

To a stirred suspension of sodium-6-chloro-5-fiuoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1 H-indole-1-carboxamide (3.5 gm, 9.7 mmole) and sodium iodide (500 mg, 3.3 mmole) in 30 ml of acetone was added 1-chloroethylmethoxyacetyl (1.8 gm, 9.7 mmole). The resultant suspension was refluxed for 7 hr, cooled and evaporated in vacuo to yield an orange solid. The solid was chromatographed on a silica gel column (125 ml silica gel) and eluted with hexane and ethyl acetate (9:1) to give the crude product. Crystallization from acetonitrile yielded a yellow solid, 1.1 gm (25%): M.P. 175-176°C.

Anal, calc'd for C,₉H,₆CIFN₂O₆S: C, 50.17; H, 3.55; N, 6.16

Found: C, 50.31; H, 3.32; N, 6.32

Example 72

6-Chloro-5-fluoro-2.3-dihvdro-3-i1-(morpholinnecarbamoyl)-ethoxv-(2-thienvl)methvlene12-ΟΧΟ-1 H-indole-1 -carboxamide

a) To a solution of morpholine (8.7 g, 0.1 mole) and triethylamine (10.1 g, 0.1 mole) in dichloromethane (120 ml) was added 1 -chloroethylchloroformate (14.3 g, 0.1 mole) at a rate to keep the solution from refluxing. After stirring for 10 min. the solution was poured into water (200 ml). The organic layer was separated and dried with magnesium sulfate and evaporated to a light brown oil 17.8 g (92%).

To a stirred suspension of sodium-6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2thienyl methylene)-2-oxo-1 H-indole-1 -carboxamide (10.g, 0.028 mole) and sodium iodide

BAD ORIGINAL ft

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-40(300 mg, 0.0017 mole) in acetone (45 ml) was added the morpholinecarbamoyl ester from step a) (5.36 g, 0.028 mole) and the mixture refluxed for 5.5 hr. The suspension was cooled and evaporated to a solid, which was chromatographed on a silica gel column (4.5 cm x 42 cm) and eluted with hexane and ethyl acetate (7:3) to give the crude product. Crystallization from acetonitrile gave a yellow solid, 2.37 gm (17.3%);

M.P 124-126°C.

Anal, cal'd for C₂₁H,₉CIFN₃O₆S: C, 50.86; H, 3.86; N, 8.47

Found: C, 50.91; H, 3.78; N, 8.54

Example 73

6-Chloro-5-fluoro-2.3-dihvdro-3-{1-(amino-cvclopentovloxymethoxv-(2-thienvl)methylenel-2-oxo-1 H-indole-1-carboxamide-methanesulfonic acid salt

a) 1-N-t-BOC-amino-1-cyclopentanecarboxylic acid

To a solution of 1-amino-1-cyclopentane carboxylic acid (10.0 g, 0.0774 mole) triethylamine (11.75 g, 0.1161 mole), water (45 ml) and 1,4-dioxane (45 ml) was added BOC-ON (20.9 g, 0.085 mole) with stirring for 7 hr at room temperature. The mixture was extracted with ethyl acetate and the ethyl acetate layer was washed with water (50 ml). The aqueous layer was acidified with citric acid to a pH of 3.5 and extracted with ethyl acetate (2 x 100 ml). The ethyl acetate layer was dried with magnesium sulfate and evaporated to yield the product as an oil, 14 g (79%).

b) 1 -N-t-BOC-amino-1 -chloromethylcyclopentanoate

To tetrabutylammonium hydrogen sulfate (22.5 g, 0.066 mole) in water (125 ml) was added slowly sodium bicarbonate (11.1 g, 0.132 mole) and stirred for 15 min. Compound a) in chloroform (250 ml) was added and stirred for 3 hrs. The organic layer was separated and dried with magnesium sulfate and evaporated to an oil. To this oil was added bromochloromethane (225 ml) and the solution was stirred overnight at room temperature. The mixture was evaporated to a viscous oil, which was triturated with ether and filtered. The filtrate was evaporated to yield the crude product as an oil 9.2 g (50%).

c) To a stirred suspension of 6-chloro-5-fluoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1H-indole-1-carboxamide sodium salt (2.85 gm, 7.92 mmole) and sodium iodide (285 mg, 1.9 mmole) in 70 ml of acetone was added 1-N-t-BOCBAD ORIGINAL

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-41amino-1-chloromethyienecyclopentanoate (2.2 grrm. 7.92 mmole). The resultant suspension was refluxed for 7 hr. The reaction suspension was cooled to room temperature and filtered to remove unreacted 6-chlorco-5-fluoro-2,3-dihydro-3-(hydroxy-2thienylmethylene)-2-oxo-1 H-indole-1-carboxamide sodium salt. The filtrate was evaporated in vacuo to an orange solid which was ccnromatographed on a silica gel pad (75 gm) and eluted with hexane and ethyl acetafcae (7:3) to yield a solid which was crystallized from acetonitrile to yield a yellow solid. 320 mg (7.1%): M.P. 204°C dec. Anal, calc'd for C₂₆H₂₇CIFN₃O₇S: C, 53.84; H, 4.69:: N. 7.24. Found: C,53.83; H, 4.42;

N, 7.29

d) A solution of the 1-N-t-B0C-amino-1-cyclopentannoy1 derivative from step c) (410 mg,

O. 7 mmole), in 10 ml of trifluoroacetic acid was stim?ed for 20 min at room temperature. The mixture was evaporated in vacuo to yield: sin oily solid, added 25 ml of dichloromethane and methanesulfonic acid (67.9 rmg, 0.7 mmole) and evaporated in vacuo to a yellow sotd. The yellow solid was stirreed in 25 ml of dichloromethane for 15 min, filtered to yieid a yellow solid, 400 mg (99%&): M.P. 230°C dec.

Anal, calc'd for C₂₂H₂₃CIFN₃O₆S₂: C, 45.87; H, 4.CD2; N, 7.30. Found: C, 45.63; H, 3.95; N, 7.19.

Example 74

6-Chloro-5-fluoro-2,3-dihvdro-3-facetoxvmethoxvcarrpony1methoxv-(2-thienvl)methylene]2-ΟΧΟ-1 H-indole-1 -carboxamide

a) To a mixture of acetoxyacetyl chloride (20 g, 0.' *46 mole and a catalytic quantity of fused zinc chloride was added paraformaldehyde (65.2 g, 0.206 mole); and the mixture was heated on a steam bath for 3.5 hr. After coaoiing the reaction was distilled and fractions collected from 72-82°C and 1.2-1.9 torr tec yield 3.2 g as an oil (13%).

b) The title product was prepared using the intenrmediate from Step a) in the same manner as described for Example 73, with the e»xception of the ratio of the eluant hexane and ethyl acetate (3:1). Crystallization from -acetonitrile gave a yellow solid, 900 mg (8.9%); M.P. 176-177°C.

Anal, calc'd for C^H^CIFN^S: C, 48.68; H, 3.01: r N. 5.98. Found: C, 48.60; H, 3.02; N, 6.00.

Example 75

6-Chloro-5-fluror-2,3-dihydro-3-[benzvlmethoxv-(2-thieenv1)methv1ene12-oxo-1 H-indole-1carboxamide

BAD ORIGINAL

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-42a) The chloromethylbenzcaate was prepared in the same manner as in Step a), Example 74. The reaction product was distilled at 74-76° C at 2.0 torr to yield the crude product as an oil 16.42 g (50%).

b) The title product was prepared using the intermediate from step a) in the same manner as described for Example 73. Crystallization from ethyl acetate gave a yellow solid, 130 mg (5.5%): M.F³ 202-203°C.

Anal, calc'd for C₂₂H.₄CIFNv,O₅S: C, 55.88; H, 2.98; N, 5.92. Found: C, 55.69; H, 2.69; N, 5.86.

Example 76

6-Chloro-5-fluoro-2.3-dihvvdro-3-i1-acetic acid-1-cyclopentvlacetoxvmethoxy-(2thienyl)methylenei-2-oxo-^: ^-indole-1 -carboxamide 1 -(4-Methoxybenzyloxycanx>onylmethyl)-1 -cyclopentaneacetic acid.

a) A mixture of 3.3-tetr£amethy1eneglutaric anhydride (10.0 gm, 5.95 mmole), 4methoxybenzyl alcohol (8.22 gm, 5.95 mmole) and pyridine (4.7 gm, 5.95 mmole) were combined and heated on a steam bath for 1.5 hr. Cooled, acidified with 6N- HCI dropwise and extracted with ether and ethyl acetate 1/1 (3 x 150 ml), washed the combined organic layers with a saturated solution of sodium bicarbonate (3 x 150 ml). The aqueous basic layer -was acidified with 6N HCI, extracted with ethyl acetate and ether (200 ml) and dried worth magnesium sulfate, evaporated in vacuo to yield a crude oil, 11.6 gm (64%).

b) 1 -(4-methoxybenzyloxyc=art>onylmethyl)-chloromethyloxycarbonylmethylcyclo-pentane was prepared as describeed in Example 73, Step b). Evaporation gave the crude product as an oil 6.5 g (48?%). which was used in Step c).

2d

c) The 4-methoxybenzyloxv. derivative of the title compound was prepared in the same manner as described in Exxample 73 (c). Yield, 300 mg (1.6%) as a red viscous oil. Anal. caJc'd for C^H^CIFN.-OeS: C, 58.49; H, 4.60; N, 4.26. Found: C, 58.89; H, 4.32; N, 4.33

d) The 4-methoxybenzyi derivative from Step c), (400 mg, 0.61 mmole), in 15 ml trifluoroacetic acid was stir-red for 45 min, evaporated in vacuo to yield a yellow solid. Added 60 ml of dichlorormethane and evaporated. The resultant yellow solid was crystallized from methanol to yield the product 600 mg (15%): M.P. 187-188°C.

BAD ORIGINAL $ «τ'

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-43Anal. calcd for C₂₄H₂₂CIFN₂O₇S: C, 53.68; H, 4.13; N, 5.22. Found: C, 53.94; N. 4.CX: N. 5.02.

Example 77

6-Chloro-5-f1uoro-2.3-dihvdro-3-iL-prolylmethoxv-(2-thienvl)methvtene)-2-oxo-1H-indole-lcarboxamide methane sulfonic acid salt

a) The chioromethyl ester of N-t-BOC-L-proline was prepared as described in Example 73, Step b). The crude product was isolated as an oil, 35.4 g (83%).

b) The N-t-BOC-L-proloyt derivative was prepared in the same manner as described ή Example 73, Step c). Crystallization from ether and hexane gave a yellow solid, 2.55 g (9.36%): M.P. 168-169°C.

Anal, calcd for C₂₅H₂₆CIFN₃O₇S: C, 52.96; H, 4.62; N, 7.41. Found: C, 52.85; H, 4.45; N, 7.43.

c) The title compound was prepared in the same manner as described in the Exampe 73, Step d). Crystallization from 2-propanol gave a yellow solid, 333 mg (34%): M.P. 90-120°C amorphous solid.

Anal, calcd for C₂₀H,₇CIFN₃O₅SCH₃SO₃H1/4H₂O: C, 44.52; H, 3.83; N, 7.42.

Found: C. 44.35; H, 3.92; N, 7.23.

Example 78

6-Chloro-5-fluoro-2,3-dihydro-3-f1-carboxylic acid-3-piperidylcarbonvlmethoxv-(2thienyl)methylene1-2-oxo-1 H-indole-1-carboxamide methane sulfonic acid salt

a) The preparation of N-t-BOC-piperidine-3-carboxylic acid is as described in Exampe 73, Step a). Yielded a crude solid 19 g. Crystallization from ethyl acetate gave a whte solid, 11.1 g (48%): M.P 162-163°C.

b) The 1-N-t-BOC-piperidine-3-chloromethyl ester was prepared in the same manner as described in Example 73, Step b). Evaporation yield a white moist solid 13.5 g (78%) and was used directly in the next step.

c) The 3-chloromethylester-1-N-t-BOC-piperidine was used to prepare the BOC derivative of the title compound in the same manner as described in Example 72. Crystallization from ether and hexane gave a yellow solid, 580 mg (2.5%): M.P. 145146°C.

Anal, calcd for C₂₆H₂₇CIFN₃O₇S: C, 53.84; H, 4.69; N, 7.24. Found: C, 53.82; H, 4.57: N, 7.16

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AP Ο Ο Ο 4 4 3

-44d) The titre compound was prepared in the same manner as described in Example 73, Step d). Crystallization from acetcne gave a yellow solid, 280 mg (68.7%): M.P. 184185°C.

Anal, calcd for C₂₂H₂₃CIFN₃O₈S₂: C, 45.87; H, 4.02; N, 7.30. Found: C, 45.75; H, 3.85; N. 717. CP-156,011.

Example 79

6-Chloro-5-fluoro-2,3-dihvdro-3-f1-carboxv-3-ethvl-3-methylpentanov1methoxv-(2thienvQmethylenel-2-oxo-1 H-indole-1 -carboxamide

The title compound was prepared in the same manner as Example 76.

CrystaJlizszon from acetone and hexane gave a yellow solid, 380 mg (27%); M.P 124125°C.

Anal. caJcc for C₂₃H₂₂CIFN₂O₇S: C. 52.62; H, 4.22; N, 5.34. Found: C, 52.83; H, 3.99;

N, 5.20.

Example 80

6-Chloro-5-fluoro-2,3-dihvdro-3-'trans-1-carboxv-2-cvclohexvlcarbonylmethoxv(2thienyl)metnylenel-2-oxo-1 H-indole-1 -carboxamide

The title compound was prepared in the same manner as Example 76.

CrystaJliZcZon from acetone gave 2 yellow solid, 590 mg (28.3%); M.P. 214-215°C. ²⁰ Anal, calcd for C₂₃H₂₀CIFN₂O₇S: C 52.83; H, 3.85; N, 5.26. Found: C, 53.17; H 3.72;

N, 5.10.

Example 81

6-Chloro-S-fluoro-2,3-dihvdro-3-lTans-1-carboxv-2-cvclopropylcarbonvlmethoxv-(225 thienyl)methylene12-oxo-1 H-indole-1-carboxamide methane sulfonic acid salt

a) The 1-h-t-BOC-cyclopropanoy! derivative of the title compound was prepared in the same marner as described in ΕχεηρΙβ 73, Step c). Crystallization from ether gave a yellow soid, 780 mg (4.4%); M.P 179-180°C.

Anal. caJcd for C₂₄H₂₃CIFN₃O₇S: C 52.22; H, 4.20; N, 7.61. Found: C, 52.30; H, 4.03; 30 N, 7.67.

b) The title compound was prepared in the same manner as described in Example 73. Crystal I izaz on from methanol gave a yellow solid. 235 mg (78%): M.P. 175-182°C. Amorphous solid.

Anal, calcd for C₁₉H₁₅CIFN₃O₅S*CH₃SO₃H*1/2H₂O: C, 43.13; H, 3.62; N, 7.54.

BAD ORIGINAL <?·

AP Ο Ο Ο 4 4 3

-45Found: C, 43.17 Η, 3.33; Ν. 746.

Example 82

6-Chloro-5-fluoro-2.3-dihvdro-3-ftrans-1-carboxv-2-cvclopropylcarbonvlmethoxv-(2thienyl)methyfenei-2-oxo-1 H-indote-1 -carboxamide

a) To a solution of sodium hydroxide (12.0 g, 0.3 mole) and water (200 ml) was added diethyl-1-2-cydopanedicarboxylaie (18.6 g, 0.10 mole) and stirred at 80°C for 5 hr. The solution was evaporated to a sold with cooling (0-5°C). Concentrated hydrochloric acid (50 ml), was added slowfy with cooling then heated on a steam bath, filtered the insolubles, and cooled in an ice-water bath. The resultant crystals were collected and dissolved in acetone and evaporated to afford the trans-1,2-cyclopanedicarboxylic acid, 6.2 g (47.6%): M.P. 176-177°C. Lit. Ref.: JACS 4994-4999 (1957) M.P. 176-177°C.

b) A mixture of trans-1,2-cyclopropanedicarboxylic acid (3.0 g, 0.0231 mole) and thionyl chloride (20 ml) was refluxed for 1.5 hr, then cooled and evaporated to yield an oil. The oil was dissolved in benzene (20 ml) and 2-(trimethylsilyl) ethanol (2.13 g, 0.018 mole), was added slowly and then stirred overnight at room temperature. The reaction mixture was filtered and evaporated to yield the crude product as a light brown oil 3.96 g (42%).

c) The 6-cHoro-5-fluoro-2.3-dihydro-2-[trans-1 -(2-trimethylsilyoxycarbonyl)-2(cyclopanoyl)-oxy-(2-thienyl)methyfene]-2-oxo-1 H-indole-1 -carboxamide (Z) isomer was prepared in the seme manner as described in Example 54 with the exception that it was separated on a siica gel pad and eluted with hexane and ethyl acetate (4:1) to give the crude product. Crystallization from chloroform and hexane gave a yellow solid, 140 mg (3.7%): M.P. 181-182°C.

Anal, cal'd for C^H^CIFNjO.SSi: C, 52.31; H, 4.39; N, 5.08. Found: C, 52.32; H,

4.36; N, 5.12.

d) The E isomer was isolated as in the same manner as described in Step c). Crystallization from chloroform and hexane gave a yellow solid, 160 mg (4.2%): M.P. 175-176°C. CP--52.775.

Anal, calc'd for C_;4H₂₄CIFN₂O₅SS<: C, 52.31; H, 4.39; N, 5.08. Found: C, 52.45; H,

4.28; N, 4.92.

e) A suspension of the trimethylsSoxycyclopropyl derivative of the title compound (800 mg, 1.45 mmole) in hydrogen fluoride-pyridine complex (5 ml) at (-20°C) was stirred

BAD ORIGINAL 6

AP 0 0 0 44 Γ

-46for 30 min, added 20 mi of water and filtered the crucoe solids. Crystallization from ether gave a yellow solid, 412 mg (61.7%): M.P. 195°C -dec.

Anal. Calc'd for C,₉H₁₂CIFN₂O₆S«1/2H₂O: C, 49.63;: H, 2.85; N, 6.09. Found: C, 49.81; H, 2.62; N, 6.06.

Example 83

6-Chloro-5-fluoro-2.3-dlivdro-3-[1,3-dioxane-5-carbopnv1methoxv-(2-thienv1)methvlene1-2oxo-1 H-indole-1 -carboxamide

a) The 1,3-dioxane-5-carboxylic acid was syntheesized as described in Synthesis Communications 23 (1974).

b) The chloromethyl ester was prepared in the san-ee manner as described in Example 73, Step c). Yielded a light yellow oil, 4.3 g (48%:

c) The 1,3-dioxane derivative, was prepared in the ssame manner as for the preparation of Example 73. Isolation from a silica gel column /42 x 5.5 cm) that was eluted with hexane and ethyl acetate (7:1) was evaporated in vaecuo to yield the product as a yellow solid, 150 mg (1.3%); M.P. 199-200°C.

Anal, calc'd for C₂₀H₁₆ClFN₂O₇S: C, 49.75; H, 3.34: : N, 5.80. Found: C, 49.84; H, 3.17; N, 5.8.

Example 84

6-Chloro-5-fluoro-2,3-dihydro-3-f1-(4-methoxvca-enzvloxvcarbonyl)-5-(3-methvl)pentovlmethoxv-(2-thienvl)methylene1-2-oxo-1 H-inccole-1 -carboxamide

a) The chloromethyl ester was prepared in the ssame manner as described in the synthesis of Example 73, Step b). The product waas isolated as an oil 9.92 g (26%). Used directly in the next step.

The title compound was prepared in the- same manner as Example 76. Crystallization from ether gave an orange solid, 15C3 mg (7.6%); M.P. 113-114°C. Anal, calc'd for C₂₃H_2£CIFN₂O₈S: C, 56.45; Η, 4.2Ξ5: N, 4.54. Found: C, 56.32; H. 4.13; N, 4.56.

Preparation 1 - Methyl (l-chloroethoxvvicarbonvloxvacetate

To an ice-water bath cooled solution of meethyl glycolate (13.5 mL) and N,Ndiisopropylethylamine (30.46 mL) in tetrahydrofuran : ?180 mL) was added dropwise with stirring 25.0 g of 1-chloroethyl chloroformate. The- 0°C bath was removed, and the mixture stirred for an additional 3 hr. After fiitrsation to remove insoluble amine hydrochloride, the THF solution was evaporated uncoer reduced pressure. The residue was dissolved in a mixture of ethyl acetate and waater. The ethyl acetate layer was

BAD ORIGINAL &

AP 0 0 0 A A 3

-47separated, dried over anh. sodium sulfate, and evaporatem under reduced pressure to give 31.1 g of 'eddish oil. NMR.

^reparation 2 - Methyl (1-iodoethoxy>carbomv1oxvacetate Sodium iodide (13.19 g), acetone (35 mL), amd methyf (1-chloroethoxy)carbonyloxyacetate (8.65 g) were heated to reflux for 2.5 hnr. After cooling, the mixture was filtered, and the filtrate evaporated in vacuo to a browcrash oil. N-methylmorpholine (1.2 mL) and 5 8 mL of the brownish oil were dissolved in SO mL of methylene chloride, and the mixture stirred at room temperature for 45 min. After filtration, the methylene chloride solution was evaporated, and ethyl acetate and water added to the residue. The ethyl acetate phase was separated, dried over anh. socriium sulfate, and evaporated to provide 2.13 g of crude product, containing about 568% methyl (1-iodoethoxy)carbonyloxyacetate and about 32% methyl (l-chloroethoaxy)carbonyloxyacetate. This crude product was used without further purification.

Preparation 3 - MN-Dimethylglycoleamide To a solution of dimethylamine (25.52 g) in 150 mL-X>f methanol was added 14.8 g of methyl glycolate, and the mixture allowed to stand at 20°C for 18 hr. Excess dimethylamine and methano! were evaporated under reducced pressure, and ethyl ether added to the residue to cause crystallization. White crystals (13.15 g) melting at 4446°C were obtained after filtration and drying.

Prepaation 4 - N,N-Qimethyl-(1-chloroethoxv)carrDonyfoxvacetamide To an ice-water bath cooled solution of N,N-dimetfnylglycolamide (15.64 g) and

Ν,Ν-diisopropyethylamine (26.4 mL) in tetrahydrofuran (1CD0 mL) was added dropwise with stirring 16 37 mL of 1-chioroethyl chloroformate. The’O°C bath was removed, and the mixture sired for an additional 4 hr. After filtration to remove insoluble amine hydrochloride. Tie THF solution was evaporated under remucted pressure to leave 25.5 g of brown solids. The crude product was slurried in p=etroleum ether, filtered, and dried in vacuo to give 19.98 g of off-white solids, mp 59-650.8°C.

Preparation 5 - N,N-Dimethyl-(1-iodoethoxv)carti:onvloxvacetamide Sodium iodide (17.16 g), acetone (35 rmL), and N,N-dimethyl-(1chloroethoxy)carbonyloxyacetamide (12.0 g) were heatesc to reflux for 1.5 hr. After cooling, the mixture was filtered, and the filtrate evaporated. Ethyl acetate was added to the residue and insolubles filtered off. After evaporation of the ethyl acetate, chloroform was added and insolubles filtered off. Evaporation of the chloroform

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AP Ο Ο Ο 4 4 3 j»8solution gave 13.0 g of reddish oil. Ethyl ether was added to the residue and the ether soluble portion was decanted from the ether insolubles. Evaporation of the ether solution gave 4.0 g of a yellow-orange oil. Methylene chloride (30 mL) and 0.42 mL of

N-methylmorpholine were added to the yellow-orange oil, and the mixture stirred at room temperature for 45 min., then concentrated in vacuo. The residue was distributed between ethyl acetate and water, and the ethyl acetate layer separated, dried over sodium sulfate, and evaporated under reduced pressure to give 2.55 g of yellow solid, shown by nmr to be about 66% N,N-dimethyl-(1-iodoethoxy)carbonyloxyacetamide and about 33% N,N-dimethyl-(1-chloroethoxy)carbonyloxyacetamide. This crude material (~ was used without further purification.

Preparaton 6 - N.N-Diethylqlycolamide

To a 0°C solution of diethylamine (1819 mL) and triethylamine (25.5 mL) in 500 mL of methylene chloride was added dropwise, with stirring, 25 g of acetoxyacetyl chloride. The ice bath was removed, and the mixture allowed to warm to 20°C while stirring for an additional 2 hr. After filtration to remove amine hydrochloride salts, the methylene chloride solution was evaporated under reduced pressure to provide 29.1 g of crude, Ν,Ν-diethylacetoxyacetamide, as a yellow oil. The yellow oil was dissolved in 125 mL of methanol and 168 mL of 1N sodium hydroxide added with stirring. A slight exotherm was noted, and the mixture was allowed to stir for 2 hr. without further warming. Solvents were removed under reduced pressure to 1/4 volume, and the

C remaining aqueous solution extracted with ethyl acetate (200 ml). The ethyl acetate extract was dried over anh. sodium sulfate, and evaporated under reduced presssure to provide 14.0 g of Ν,Ν-diethylglycolamide as a yellow oil.

Preparation 7 - N.N-Diethvl-(1-chloroethoxv)carbonyloxvacetamide

To an ice-water bath cooled solution of Ν,Ν-diethylglycolamide (19.25 g) and Ν,Ν-diisopropylethylamine (26.2 mL) in tetrahydrofuran (100 mL) was added dropwise with stirring 15.8 mL of 1-chloroethyl chloroformate. The ice bath was removed, and the mixture stirred for an additional 4 hr. After filtration to remove insoluble amine hydrochloride, the THF solution was evaporated under reduced pressure. The solid residue was dissolved in ethyl acetate and the solution washed with water, dried over anh. sodium sulfate, and evaporated to a solid residue. After slurrying in ethyl ether,

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-49the solid was filtered and dried to give 18.4 g of off-white crystais melting at 76-78°C.

Preparation 8 - N,N-Diethvf-(1^odoethoxy)carbonvloxvacetamide Sodium iodide (15.14 g), acetone (35 mL), and N,N-diechyl-(1-chloroethoxy)carbonyloxyacetamide (12.0 g) were heated to reflux for 1.5 hr. After cooling, the mixture was filtered, and the filtrate evaporated. Ethyl acetate and water were added to the residue with stirring. The ethyl acetate layer was separated, dried over anh. sodium sulfate, and evaporated in vacuo to give 13.6 g of reddsh solid, which was shown by nmr to be about 58% N,N-diethyl-(1-iodoethoxy)carboryloxy-acetamide and about 42% N,N-diethyl-(1-chloroethoxy)carbonyloxyacetamide. Trie material was used without further purification.

Preparation 9 - Dimethylammonium Ν,Ν-dimethylsuccinamate Dimethylamine gas was bubbled siowly for 1 hr. into a precooled (0°C) mixture of succinic anhydride (10 g) and tetahydrofuran (75 mL). The cooling bath was removed, and the reaction mixture stirred an additional 30 min., then evaporated under reduced pressure to give 17.57 g of clear oil.

Preparation 10 - Chloromethyl N.N-dimethylsucciramate To 50 mL of methylene chloride was added, with stirring. 10 ml of water, 31.4 g of tetrabutylammonium hydrogen sulfate. 92.5 mLof 1N sodium hydroxide, and 17.57 g of dimethylammonium Ν,Ν-dimethylsuccinamate dissolved in 50 mL of methylene chloride. After stirring for 2.25 hr., the methylene chloride layer was separated, dried over anh. sodium sulfate, and evaporated in vacuo to give 26.8 g of oil. The oil was dissolved in 100 mL of bromochloromethane and stirred at 2C°C for 17 hr. After evaporation of the bromochloromethane in vacuo, the residual bi was extracted with ethyl ether severed times. The ether extracts were combined and e/aporated to give 5.4 g of oil. The crude product was purified oy chromatography on silica gel using 70:30 chloroform-ethyl acetate. Fractions contaning the desired product were combined and concentrated to give 2.3 g of clear oil.

Preparation 11 - lodomefriyl Ν,Ν-dimethylsuccinamate Sodium iodide (3.57 g) was added to a solution o? chloromethyl Ν,Νdimethylsuccinamate (2.3 g) in 10 mL acetone, and the mixture sirred at 20°C for 2 hr. After evaporation of the solvent in vacuo, the residue was dissolved in a mixture of

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AP 0 0 0 4 4 3

50methylene chloride aand water. The methylene chloride layer was separated, dried over anh. sodium sulfare-- and evaporated to give 3.27 g of a brownish oil, which was used without further punficcation.

Preeaaration 12 - Chloromethyl Ν,Ν-diethylsuccinamate

Tetrabutyiarmmonium hydrogen sulfate (19.6 g), Ν,Ν-diethyl succinamic add (10.0 g), sodium ^bicarbonate (4.85 g) and 1N sodium hydroxide (58 mL) were combined in 400 mt_ methylene chloride and 80 mL water with stirring. After 1.5 hr., the phases were separated. The methylene chloride layer was dried over anh. sodium sulfate and evaporaated under reduced pressure to give 9.6 g of oil. The aqueous layer was extracted with additional methylene chloride, and an additional 4.2 g of oil was obtained after scruvent drying and evaporation. A portion (4.2 g) of this oily tetrabutylammonfijm salt was dissolved in 100 mL of bromochloromethane and the solution was alicwwed to stir at 20°C for 40 hr. After evaporation of the bromochloromethanne in vacuo, the residue was repeatedly extracted with ethyl ether. The combined ethyl < ether extracts were evaporated to 2.3 g of clear oil. The oil was purified by chromarcography on silica gel, with elution by 80:20 chloroform-ethyl acetate to give 1.62 g of cii.

Preeparation 13 - lodomethyl Ν,Ν-diethylsuccinamate

Sodium iocicde (2.19 g) and chloromethyl Ν,Ν-diethylsuccinamate (1.62 g) were combined with 15 *nL acetone, and the mixture stirred at 20°C for 3 hr. Solvent was evaporated in vacueo. and the residue distributed between methylene chloride and water. The methyieene chloride layer was separated, dried over anh. sodium sulfale, and evaporated urcaer reduced pressure to give 1.81 g of oil which was used without further purification.

Preparation 14 - Dipropylammonium N.N-dipropylsuccinamate

Succinic arnnydride (15.0 g) was added to a precooled (0°C) solution of dipropylamine (41 -mL) in 200 mL methanol. The cooling bath was removed and the mixture stirred for 3C0 min. before solvent evaporation to give 42.8 g of pale yellow oil.

Preeaaration 15 - Chloromethyl N.N-dipropylsuccinamate

A mixture ccontalning dipropylammonium N.N-dipropylsuccinamate (41.8 g), tetrabutylammoniurm hydrogen sulfate (48.05g), methylene chloride (250 mL), water (80 mL), and 1N sodium hydroxide (142 mL) was stirred for 1.5 hr. The methylene chloride layer was separatee- dried over anh. sodium sulfate, and evaporated in vacuo to give

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AP 0 0 0 4 4 3

-5144.12 g of os Twenty grams of this oil was dissolved in 100 mL of bromochrcoromethane, anc re solution stirred for 4.5 hr. Bromochloromethane was evaporaieod in vacuo. The resdue was extracted several times with ethyl ether, and the ether extraacts combined ar>c evaporated to give 6.5 g of yellow oil, which was used without fucrther purification.

Preparation 16 - lodomethyl N.N-dipropylsuccinamate Sodiurr iodide (7.8 g) was added to a solution of chloromethyl Ν,Ν-diproopyfsuccinamate Ξ 5 g) in 30 mL acetone, and the mixture stirred for 2.5 hr. After evaporation o' the solvent in vacuo, the residue was dissolved in a mixturee of methylene chlcrde and water. The methylene chloride layer was separated, dried cover anh. sodium sJfate, and evaporated to give 8.8 g of orange oil, which was uused without furtner 3urification.

Pr&pa~ation 17 - Homopiperidinium 4-homopiperidino-4-oxobutyrate Succinic anhydride (15.0 g) was added carefully to a solution of homopiperexiine (33.78 mL) in tsrahydrofuran (100 mL), and the mixture allowed to stir for 30 min. The solvent was evaporated in vacuo to give 33.16 g of oil.

Preparation 18 - Chloromethyl 4-homopiperidino-4-oxobutyrate A mixt_re of homopiperidinium 4-homopiperidino-4-oxobutyrate (33.16 g), tetrabutylammcnium hydrogen sulfate (49.74 g), methylene chloride (200 mL), water' (50 mL), and 1N sodium hydroxide (146 mL) was stirred for 1.5 hr. The methylene chkxcride phase was separated, dried over anh. sodium sulfate, and evaporated in vacuo to 'cgrve 22.0 g of a clear oil. The oil was dissolved in 100 mL of bromochloromethane and stirred for 17 h' at 20°C. After in vacuo evaporation of the bromochloromethane, the residue was exacted with ethyl ether. The ether solution was dried over socmum sulfate and evaporated in vacuo to give 10.5 g of oil. This oil was purifiea by chromatograp-y on silica gel using 85:15 chloroform-ethyl acetate as eluant. Fractions containing tne cesired chloromethyl ester were combined and evaporated to give -^.36 g of clear ou.

Preparation 19 - lodomethyl 4-homopiperidino-4-oxobutyrate Sodicirr odide (5.28 g) was added to a solution of chloromethyl 4-homopux>eridino-4-oxobuh^rate (4.36 g) in 20 mL of acetone, and the mixture stirred for 3 hr. “The solvent was evaporated in vacuo, and the residue distributed between water and methylene chlcnde. The methylene chloride layer was separated, dried over anh.

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AP 0 00 4 4 3

-52sodium sulfate, and evaporated in vacuo to give 4.4 g of yellow on,., which was used without further purification.

Preparation 20 - Methyl N.N-dimethylaminocarbonyloxvsacetate

Pyridine (67 mL), methyl glycolate (12.85 mL), and dimethyuicarbannyt chloride j 15.33 mL) were combined at 0°C, then the cooling bath removecc and the solution allowed to stir at 20°C for 17 hr. The reaction mixture was then heaated at 65°C for 4 hr. cooled, ethyl acetate and water added, and the mixture was rmade acidic by the addition of 1N HCl. The ethyl acetate layer was separated, washeed with brine, dried over anh. sodium sulfate, and concentrated in vacuo to give 7.1 g .-of yellow oil. The •esidue was chromatographed on silica gel with chloroform as eluant,: Collection tubes determined to contain the desired product were combined and concsentrated to give 2.5 g of oil.

Preparation 21 - N.N-dimethylaminocarbonvIoxyacetic acid, ssodium salt

The ester described above (2.5 g) was dissolved in 10 mL meethanol, 1N sodium hydroxide (15.5 mL) added, and the solution allowed to stir aat 2O°C for 1 hr. Evaporation of the reaction mixture under reduced pressure provideed a white soid that was used without further purification.

Preparation 22 - Chloromethyl N.N-dimethylaminocarbonytcoxvacetate

The Ν,Ν-dimethylaminocarbonyloxyacetic acid sodium saalt (2.62 g) was combined with 100 mL methylene chloride, 30 mL water, 5.27 g of tetrabutylammonium hydrogen sulfate and 1.3 g of sodium becarbonate and stirrea for 1.5 hr. The methylene chloride layer was removed, dried over anh. sodium sultarse, and evaporated in vacuo to provide 2.8 g of oil. The oil was dissolved in 80 mt_ of bromochloromethane and stirred at 20°C for 18 hr.. The methylene chloride ^was evaporated in vacuo and the residue extracted several times with ethyl ether. “The extracts were combined and evaporated to give 0.95 g of oil, which was useed without further purification.

Preparation 23 - lodomethyl N.N-dimethylaminocarbonyloxxvacetate

Sodium iodide (1.46 g) and chloromethyl N,N-dimethylaminocaarbonyloxyacetate _t0.95 g) were combined with 30 mL of acetone, and stirred at 20^aJC for 19 hr. The acetone was evaporated in vacuo to give 1.18 g of oil, which was ussed without further purification.

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AP 0 0 0 4 4 3

-53Preparation 24 - Methyl N.N-diethylaminocarbonyloxvacetate Pyridine (54 mL), methyl glycolate (10.3 mL), and diethylcarbamyl chloride (16.9 mL) were combined, heated for 40 hr. at 65°C, for an additional 24 hr. at 85°C, and an additional 24 hr. at 95°C. After cooling, the reaction mixture was distributed between ethyl acetate and water. The ethyl acetate layer was separated, washed with 1N HCI, water, and brine, dried over anh. sodium sulfate, and concentrated in vacuo to give 15.0 g of oil which was used without further purification.

Preparation 25 - N.N-Diethylaminocarbonyloxvacetic add, sodium salt The ester described above (15 g) was dissolved in 100 mL methanol, 1N sodium hydroxide (79.3 mL) added, and the solution allowed to stir at 20°C for 1.5 hr. Evaporation of the reaction mixture under reduced pressure provided a white solid, 15.3 g after drying of P₂O₅, that was used without further purification.

Preparation 26 - lodomethyl Ν,Ν-diethylaminocarbonvtoxyacetate Ν,Ν-Diethylaminocarbonyloxyacetic acid sodium salt (15.3g) was combined with

800 mL methylene chloride, 240 mL water, 26.35 g of tetrabutylammonium hydrogen sulfate and 6.52 g of sodium bicarbonate and stirred for 1.5 hr. The methylene chloride layer was removed, dried over anh. sodium sulfate, and evaporated in vacuo and the residue extracted several times with ethyl ether. The extracts were combined and evaporated to give 10.63 g of oil. This crude chloromethyl ester was combined with sodium iodide (14.25 g) in 100 mL of acetone and stirred at 20°C for 3.5 hr. Solvent was evaporated in vacuo, and the residue distributed between chloroform and water. The chloroform layer was dried over anh. sodium sulfate and evaporated in vacuo to give 11.56 g of light yellow oil that was used without further purification.

Preparation 27 - Ethyl N-pivaloylqlycinate To a stirred, ice-bath cooled flask containing 150 mL of methylene chloride were added ethyl glycinate hydrochloride (25.0 g), pivaloyl chloride (20.9 mL) and, slowly, 62.4 mL of Ν,Ν-diisopropylethylamine. After removal of the ice bath, the reaction solution was stirred for 4 hr. Solvent was evaporated in vacuo and the residual oil distributed between added ethyl acetate and water. The ethyl acetate layer was washed with a 1:1 mixture of sat. aq. sodium bicarbonate and water, dried over anh. sodium sulfate, and evaporated in vacuo to give 11.3 g of oil.

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AP Ο Ο Ο 4 4 3

-54Preparation 28 - Sodium N-pivaloylglycinate To a solution of ethyl N-pivaloylglycinate (11.3 g) in 50 mL of methanol was added 69.2 mL of 1N sodium hydroxide, and the solution stirred for 2 hr. Solvents were 5 evaporated in vacuo. Fresh methanol was added and reevaporaied to give 12.45 g of off-white solid.

Preparation 29 - Chloromethyl N-pivaloylqlycingte To a stirred solution of sodium N-pivaloylglycinate (12.45 g) and tetrabutylammonium hydrogen sulfate (21.8 g) in 100 mL methylene chloride and 50 mL water was added 64.3 mL 1N sodium hydroxide, and the mixture stirred for 3 hr. The methylene chloride layer was separated, dried over sodium sulfale, and evaporated in vacuo to give 20.9 g of oil. The oil was dissolved in 50 mL of bromochloromethane and stirred for 17 hr. at 20°C. After evaporation of the bromochloromethane, the residue was repeatedly extracted with ethyl ether. The combined extracts were evaporated in vacuo to give 2.2 g of oil. Chromatography on silica gel with chloroform-ethyl acetate elution gave 1.2 g of the chloromethyl ester.

Preparation 30 - lodomethyl N-pivaloylqlycinaie A mixture of sodium iodide (1.71 g), chloromethyl N-pivaloyglycinate (1.2 g) and acetone (20 mL) was stirred at 20° C for 19 hr. The solvent was evaporated in vacuo and the residue distributed between added chloroform and water. The phases were separated and the water layer reextracted with chloroform. The chloroform layers were combined, dried over anh sodium sulfate, and evaporated in vacuo to give 1.45 g of

C oil. This material was used without further purification.

Preparation 31 - Ethyl N-(2-ethylbutvrvl)qlycina:e

To a stirred, ice-bath cooled flask containing 200 mL of memylene chloride were added ethyl glycinate hydrochloride (25.0), 2-ethylbutyric anhycride (39.3 mL) and, slowly, 54.8 mL of triethylamine. After removal of the ice bath, the reaction solution was stirred for 17 hr. Solvent was evaporated in vacuo and the residue distributed between added ethyl acetate and water. The ethyl acetate layer was washed with a 1:1 mixture of saturated aqueous sodium bicarbonate and water, dried over anh. sodium sulfate, and evaporated in vacuo to give 33.73 g of white fluffy solid.

Preparation 32 - Sodium N-(2-ethylbutvrvl)qlycirate To a solution of ethyf N-(2-ethylbutyryl)glycinate (33.73 g) in 100 mL of methanol was added 167.6 mL of IN sodium hydroxide, and the solution stirred for 1.5 hr.

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AP 0 0 0 4 4 3

-55Solvents were evaporated in vacuo, and then '“fresh methanol was added and evaporated to give 32.6 g of a pale yellow oil.

Preparation 33 - Chloromethyl N-f2-ettinvolbutvrvl)qlvcinate To a stirred solution of sodium N-(2-etimyftxJtyryl)glycinate (32.6 g) and tetrabutylammonium hydrogen sulfate (53.3 g) in 1000 mL methylene chloride and 100 mL water was added 157 mL of 1N sodium hydroxwJe, and the mixture stirred for 2.5 hr. The phases were separated, and the aqueooas layer reextracted with 400 mL methylene chloride. The organic layers were combineed, dried over sodium sulfate, and evaporated in vacuo to give 59.8 g of oil. Thee oil was dissolved in 75 mL of bromochloromethane and stirred for 15 hr. at Z20°C. After evaporation of the bromochloromethane, the residue was repeatedly extracted with ethyl ether. The combined extracts were evaporated in vacuo to give /7.84 g of oil. Chromatography on silica gel with chloroform-ethyl acetate (3:1) elutionn gave 2.33 g of the chloromethyl ester.

Preparation 34 - lodomethyl N-(2-ettmvlbutvrvl)qlvcinate A mixture of sodium iodide (3.15 g), chloromeethyl N-(2-ethylbutyrl)glycinate (2.33

g) and acetone (20 mL) was stirred at 20°C for 17 hnr. The solvent was evaporated in vacuo and the residue distributed between added meethylene chloride and water. The phases were separated and the water layer reextraccaed twice with methylene chloride. The organic extracts were combined, dried over ann?.. sodium sulfate, and evaporated in vacuo to give 2.78 g of solid. This material was >_used without further purification.

Preparation 35 - 1-lodoethyl isoprcopyl carbonate 1-Chloroethyl chloroformate was converted tzo 1-iodoethyl isopropyl carbonate using the procedure given by Wan-Joo Kim, et al, Thee Journal of Antibiotics, (1991) 44, pg. 1086.

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ORIGINAL

J

AP 0 GO 4 4 3

-56HALOALKYL ESTER INTERMEDIATES

Preparation	R1	R2	R3	Ή NMR Date (CDCI3), <S
1	Me	OCH2CO2Me	Cl	1.83 (d, 3H); 3.77 (s, 3H); 4.67 (ABq, 2H); 6.40 (q, 1H).
4	Me	OCH2CONMe2	Cl	1.86 (d, 3H); 2.97 (s, 3H); 2.99 (s, 3H); 2.99 (s, 3H); 4.68 (d, 1H); 4.90 (d, 1H); 6.45 (q, 1H).
7	Me	OCH2CONEt2	Cl	1-10 (t, 3H); 1.19 (t, 3H); 1.81 (d, 3H); 3.18 (q, 2H); 3.37 (q, 2H); 4.64 (d, 1H); 4.86 (d, 1H); 6.41 (q, 1H).
10	H	CH2CH2CONMe,	Cl	2.62-2.78 (m, 4H); 2.96 (s, 3H); 3.04 (s, 3H); 5.72 (s, 2H).
11	H	CH2CH2CONMe2	1	2.67 (s, 4H); 2.96 (s, 3H); 3.03 (s, 3H); 5.93 (s, 2H).
12	H	CHjCHjCONEt.	Cl	1.02 (t, 3H); 1.14 (t, 3H); 2.54-2.71 (m, 4H); 3.21-3.38 (m, 4H); 5.84 (s, 2H).
13	H	CH2CH2CONEt.	1	1.14 (t, 3H); 1.24 (t, 3H); 2.68-2.81 (m, 4H); 3.32-3.50 (m, 4H); 5.92 (s, 2H).
15	H	CH2CH2CONPr.	Cl	0.86 (t, 3H): 0.94 (t, 3H); 1.44-1.78 (m, 4H); 2.60-2.84 (m, 4H); 3.16-3.40 (m,4H); 5.72 (s, 2H).
19	H	(CH2)2CON(CH.!5	1	1.50-1.90 (m, 8H); 2.65-2.80 (m, 4H); 3.44-3.64 (m, 4H); 5.93 (s, 2H).
22	H	CH2OCONMe2	Cl	2.92 (s, 3H); 2.95 (s, 3H); 4.63 (s, 2H); 5.73 (s, 2H).
23	H	CH2OCONMe2	1	2.96 (s, 3h); 2.99 (s, 3H); 4.61 (s, 2H); 5.95 (s, 2H).
26	H	CH2OCONEt2	Cl	1.12-1.23 (m, 6H); 3.27-3.38 (m, 4H); 4.70 (s, 2H); 5.76 (s, 2H).
29	H	CH2NHCOCMe,	Cl	1.24 (s, 9H); 4.12 (d, 2H); 5.75 (s, 2H); 6.15 (br. s, 1H).

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AP Ο 9 Ο 4 4 3

30	H	CHjNHCOCMe3	1	1.25 (s, 9H); 4.06 (d, 2h); I 5.96 (s, 2H); 6.15 (br. s, 1H).
34	H	CHjNHSOCHEtj	1	0.93 (t, 6H); 1.44-1.75 (m, 4H); 1.92-2.10 (m, 1H); 4.10 (ABq, 2H); 5.93 (br. s, 1H); 5.96 (s, 2H).

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AP 0 Of) 4 4 3

-59l-iannij fltCTiil'K t;-»e >icJ .c,- r.iit ^v i'lr-r'/yQ JOB -: zzZ hl .· — -t-rra

Claims (15)

1. A compound of the formula:

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   AP 0 C Ο 4 4 3 wherein x is 0 or 1;

   VI

   A is aCC.-C₅ alkylene or C₂-C_e alkenyl chain, optionally substituted with up to two substituents independently selected from C,,-C₇ alkyl or C₃-C₇ cycloalkyl; or {CH-)_.O(CH-)_m, where the methylene groups may be optionally substituted with up to two substituents independently selected from C,C₇ alkyl or C₃-C₇ cycloalkyl; or a C₃-C₇ cycloalkyl or cycloalkenyl group optionally substituted with up to two C,-C₃ alkyl groups; or a 4 - 7 membered hetero-alicyclic group containing an O, S or NR⁶ link; or a phenylene group optionally substituted with up to two substituents independently selected from C,-C₃ alkyl, C.-C₃ alkyloxy, halogen or CF₃;

   B is C₂-C₅ alkenyl phenyl, 2.3 or 4-pyridyl, 2.3 or 4-piperidinyl, 2- or 3pyrrolidinyl, -OCH_:CO_;R or -OCH₂CONR²R³;

   R' is H, C.-C₃ alkyl, C₃-C₇ cycloalkyl, phenyl(C.-C₄)alkyl, (CH₂)_pCO₂R², or CH2).CONR²R³, (CH.)_Si(CH3)₂; or

   R’ ra form v/ith A a 5, 6 or 7 membered lactone ring optionally substituted with a C,-C₃alkyl group.

   R² a-cc R³ are independently H, C,-C₇ alkyl, C₃-C₇ cycdalkyl, phenyl(C,CJalkyl; or

   R·' arc; R^J, when taken together with the attached nitrogen, may represent a pyrrolidine, piperidine, morpholine or homopiperidine group optionally substituted with up to two C,-C₃ groups; or

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   ΑΡ Π Π 0 4 4 J

   -60R⁸ is Η, C,-Ce alkyf, (CH2)„COOR², C3-C, cycctodkyf optionally substituted with up to two C,-C_e alkyl groups, phenyW(C,-CJalkyl optionally substituted on the phenyl ring with up to two suobstituents independently selected from C,-C₃alkyl, C,-C₃ alkyloxy, haJocgjen or CF₃, COR², CONR²R³, or a phenyl group optionally substitutes! with up to two substituents independently seleoted from C,-C₃ alkxyt, C₃-C₃ alkyloxy, halogen or CF₃; or when taken with R⁴ and the attached oxygens, may represent an ox etan, tetrahydrofuran, tetrahydropyran or ooxepan ring optionally substituted with up to two C,-C₃ alkyl groups;

   R’ and R⁸ are independently H, C,-C_e aJkyl, CC₃-C₇ cycloalkyl, phenyl(C,C₄) alkyl, COR², COOR²; or independently C₂-C₇ alkanoyl, C₄-C₈ cycloalktianoyl, optionally substituted with up to two substituents independeentty selected from C,-C_e alkyl, C₃C₇ cycloalkyl, phenyl(C,-C₄)aJkyl, C₃-CC₇ branched alkyl; or

   R⁷ and R⁸ when taken together with the attacched nitrogen may represent a pyrrolidine, piperidine or homopiperiadine group optionally substituted with up to two substituents independently selected from C,-C_e alkyl, C₃C₇ cycloalkyl, C₃-C₇ branched alkyl, oc- oxo;

   R⁸ is H or methyl;

   R¹⁰, R”, R¹² and R'³ are independently selectsed from C,-C₄ alkyl and halogen; m and n are independently 0, 1 or 2 where either m or n must be at least = 1; and p is 1 to 3;

   and with the proviso that when R is the structure of Formula II, and x is,

   A must be a group other than C₂-C_e alkylene.
2. 2. A compound of claim 1, wherein one of R’° amd R” is 5-fluoro and the other is 6-chloro.
3. 3. A compound of claim 2, wherein R is

   ΜΛ,

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   AP Ο ο o a 4 3

   -612. A compound of claim 1, wherein one of R’° and R” is 5-fluoro and the other is 6-chloro.

   3. A compound of claim 2, wherein R is

   R⁹ 0 0
4. 4.
5. 5.
6. 6.
7. 7.
8. 8.
9. 9.

   A compound of claim 3 wherein x is 0.

   A compound of claim 4 wherein A is a C₂-C₆ alkenyl chain and R¹ is hydrogen. A compound of claim 5 wherein R” and R^{13 14} are hydrogen.

   A compound of claim 3 wherein x is 1.

   A compound of claim 7 wherein A is C,-C₅ alkylene.

   A compound of claim 8 wherein R¹ is benzyl.

   R⁹ 0

   A compound of claim 2 wherein R is
10. 11. A compound of claim 10 wherein R⁴, R⁹, R’² and R¹³ are hydrogen, R⁵ is hydrogen, methyl or ethyl and R^e is hydrogen, methyl, benzyl or CH₂COCR³.
11. 12.

    A compound of claim 2 wherein R is
12. 13. A compound of claim 12 wherein R⁴, R⁹, R⁷, R⁸, R’², and R'³ are hydrogen and R⁵ is (CH₂)_pNR⁷R⁸, methyl or benzyl.
13. 14. A compound of claim 12 wherein R⁷ is COR².

    R⁹ 0
14. 15.

    A compound of claim 2 wherein R is and x is 1.

    BAD ORIGINAL

    -6216. A compound of claim 15 wherein B is 2 or 3-pyrrolidine.

    R³ ο o
15. 17. A compound of claim 2, wherein R is I Hu