Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
  • C07C235/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton
  • C07C235/32—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings
  • C07C235/34—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
  • C07D217/12—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with radicals, substituted by hetero atoms, attached to carbon atoms of the nitrogen-containing ring
  • C07D217/18—Aralkyl radicals
  • C07D217/20—Aralkyl radicals with oxygen atoms directly attached to the aromatic ring of said aralkyl radical, e.g. papaverine
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D221/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom as the only ring hetero atom, not provided for by groups C07D211/00 - C07D219/00
  • C07D221/02—Heterocyclic compounds containing six-membered rings having one nitrogen atom as the only ring hetero atom, not provided for by groups C07D211/00 - C07D219/00 condensed with carbocyclic rings or ring systems
  • C07D221/22—Bridged ring systems
  • C07D221/28—Morphinans

Definitions

• Grewe cyclization is a ring closure method that in the present invention utilizes bromine or other halogens as a positional blocking group.
• the deactivating influence of halogen on the phenolic ring is overcome by the use of "super" acids in the Grewe cyclization (J. Het. Chem., June 1974, 363).
• the key intermediate has an additional hydroxyl substitution on the aromatic ring that allows for Grewe cyclization under milder acid conditions, HCl/ethyl ether, but requires a subsequent dehydroxlation step to remove this activating function.
• the Rice intermediates that undergo Grewe cyclization contain a methoxy, o- hydroxyl and m-bromo substitution pattern on the aromatic ring. Since these functions do not electron donate as much as three hydroxyls (Beyerman), a "super" acid medium, triflic acid, must be used to form the morphinan ring system. Any water contamination in the trifle acid greatly reduces the yield by the formation of a ⁇ , ⁇ -bicyclic-ketone and its polymerization by-products. Therefore, the Rice synthesis has a critical cyclization reaction in the middle of the route with very limited, severe, expensive acid requirements.
• the dissolving metal reduction reaction well known in the art as the Birch reduction is used for reducing compounds, including the reduction of aromatic compounds to 1,3- cyclohexadiene or 1,4-cyclohexadiene and dehalogenation reactions. Although run under severe reaction conditions, the reduction is an important transformational tool for chemists and has been widely applied in organic synthesis in the partial reduction of an aromatic ring to 1,4-cyclohexadienes or 1,3-cyclohexadienes. Reduction of other functional groups on an aromatic ring or olefin, including the C-X bond, wherein X is a halogen, to C-H usually occurs.
• the dissolving metal reduction comprises reacting with an alkali metal in the presence of a nitrogen containing base, usually ammonia.
• the alkali metal is typically Li, Na, K or Ca in a solvent system including simple alcohols and ethers held at reduced temperature.
• the modified reduction reaction utilized in the present invention provides a method for preventing the reduction of at least one halogen substituted aromatic ring of an aromatic compound, while allowing the reduction of at least one functional group on the aromatic compound.
• This method is the subject of co-pending provisional application Ser. No. 60/534592, filed January 6, 2004, to the same assignee as the present invention.
• at least one hydroxyl group and one halogen are substituted on the aromatic ring that does not undergo reduction.
• the aromatic compound is then reacted with at least one alkali metal in at least one nitrogen containing base and at least one alcohol, while maintaining a ratio of the alcohol to the nitrogen containing base.
• At least, one halogen suDstmiied aromatic ring with a hydroxyl function is protected from reduction, while the desired group is reduced.
• the reaction requires mild reaction conditions for the dissolving metal reduction.
• the modified metal reduction uses an alkali metal, typically lithium, sodium, potassium, calcium or a mixture thereof as a reductive reagent.
• the reaction further includes a nitrogen containing base, typically ammonia or a lower amine, and the presence of at least one alcohol.
• Suitable lower amines include but are not limited to ammonia, methylamine, ethylamine, ethylenediamine and mixtures thereof.
• the following solvent/nitrogen bases are particularly well suited for the present invention: a mixture of at least one alcohol and ammonia or at least one lower amine, or at least one alcohol, ammonia or at least one lower amine and at least one organic co-solvent.
• Suitable organic co-solvents include but are not limited to THF, ether and mixtures thereof.
• the dissolving metal reduction is carried out at a reduced temperature and at a ratio of nitrogen containing base to alcohol at which the reduction or dehalogenation of the protected aromatic ring is prevented.
• a presently preferred ratio of alcohol to nitrogen containing base is about 1:1 to about 1:4.
• the reaction temperature is typically maintained at about -3O 0 C or lower.
• a method for the synthesis of an opiate intermediate comprises: [0010] a) reacting a compound of Formula 1
• X is a F or CIj-X 1 is a Cl or Br; and wherein Y is SO when the halide is sulfonyl halide, and PCl when the halide is phosphorous halide; [0014] b) reacting the compound of Formula 2 with a compound of Formula 3
• R' is an alkyl, aryl or acyl group, in the presence of a base to form a compound of Formula 4;
• X is a F or Cl; and R' is an alkyl, aryl or acyl group,
• X is a F or Cl; and R' is an alkyl, aryl or acyl group,
• X is a F or Cl and R' is an alkyl, aryl or acyl group
• X is a F or Cl
• R' is an alkyl, aryl, or acyl
• R is selected from the group consisting of formyl (CO), COR", COOR", Bn(benzyl), alkyl(methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, allyl, and etc.), and sulfonamide SO 2 CH 2 COPh, and wherein R" is selected from the group consisting of alkyl and aryl.
• X is a F or Cl; and R is an H, alkyl, aryl, acyl, formyl, COR", COOR", Bn(benzyl), alkyl(methyl), and sulfonamide SO 2 CH 2 COPIi.
• X is a F or Cl and R is selected from the group consisting of formyl, COR", COOR", Bn(benzyl), alkyl(methyl), and sulfonamide SO 2 CH 2 COPh.
• X is a F or Cl and R' is an alkyl, aryl or acyl group
• X is a F and Cl and R' is an alkyl, aryl or acyl group
• X is a F or Cl and R' is an alkyl, aryl or acyl group
• X is a F or Cl and R' is an alkyl, aryl or acyl group
• X is a F or Cl and R is an H, alkyl, aryl or acyl group
• X is a F or Cl and R is an H, alkyl, aryl or acyl group.
• An embodiment of the present method comprises reacting a compound of Formula 1
• X is a F or Cl; [0039] with a sulfonyl halide or a phosphorous halide to form a compound of Formula 2.
• Suitable sulfonyl halides include SOCl 2 and SOBr 2 with SOCl 2 being preferred.
• Suitable phosphorous halides include PBr 3 , PCl 3 and PCI5. The halide reacts with the diol to form the heterocyclic ring of Formula 2. Iu an illustrative embodiment Formula 1 is heated to reflux in SOCl 2 /toluene for about 3 hours, after which the solvent is removed by distillation.
• Y is SO; X is F or Cl and X 1 is Cl or Br. In an embodiment where a phosphorous halide is utilized, Y would be PCl.
• Formula 2 is then reacted with a compound of Formula 3 in the presence of a base to form a compound according to formula 4.
• Suitable bases include alkali bicarbonates, alkali carbonates, alkali phosphates(di- and tri-), ammonium hydroxide, ammonium acetate, organic buffers such as BICINE, TRICINE, TRIS, CAPS, CAPSO, EPPS, HEPES, MES, MOPS, PIPES 3 TAPS, TES or their sodium salts ; organic bases like pyridine, triethylamine, diisopropylethylamine, N-methylmorpholine, N,N-dimethylaminopyridine or mixtures thereof.
• formula 2 is added to a mixture of NaHCO 3 /Na 3 CO 3 /NaHSO 3 /H2O and Formula 3. After stirring the layers were separated to recover Formula 4 from the organic layer.
• R' is an alkyl, aryl or acyl group
• the compound of Formula 4 is then treated with at least one phosphoryl halide followed by hydrolysis to form a compound according to Formula 5.
• Suitable phosphoryl halides include POCl 3 and POBr 3 , with POCl 3 being preferred.
• Suitable methods of hydrolysis include aqueous reflux at adjusted pH.
• Typical bases utilized to adjust the pH to a desired range include alkali carbonates, alkali phosphates, sodium hydroxide, sodium acetate, ammonium acetate or ammonium hydroxide.
• Li an illustrative embodiment, the compound of Formula 4 heated to a temperature in POCl 3 /acetonitrile at which it completely dissolves is taken to reflux. An oily product is recovered, re-dissolved in acetonitrile, pH adjusted to 4-5 and refluxed.
• Formula 5 is produced as a crystalline solid.
• Formula 5 as a free imine is then reduced to form Formula 6.
• Suitable reduction reactions include NaBH 4 , NaCNBH 3 , H 2 and Pt, Pd, Ir, Ru or Rh on Carbon in a solvent such as ethanol, methanol, isopropanol, propanol, formic, formate salt and acid, THF, ethyl acetate, and mixtures thereof.
• chiral organometallic catalysts (Ru, Rh, Ir, Pt, Pd,...
• chiral bearing chiral ligands or chiral hydrides may be used to induce the enantiomeric center at the benzylic position adjacent to the nitrogen, hi the chiral case, for example, sodium triacyloxyborohydride generated from N- benzyloxycarbonylproline and borohydrides has been used to prepare similar enantiomeric tetrahydroquinolines from the corresponding imines.
• Formula 6 is then selectively reduced to form a compound of Formula 7.
• the reaction requires mild reaction conditions for the dissolving metal reduction.
• the modified metal reduction uses an alkali metal, typically lithium, sodium, potassium, calcium or a mixture thereof as a reductive reagent.
• the reaction further includes a nitrogen containing base, typically ammonia or a lower amine, and the presence of at least one alcohol.
• Suitable lower amines include but are not limited to ammonia, methylamine, ethylamine and mixtures thereof.
• solvent/nitrogen bases are particularly well suited for the present invention: a mixture of at least one alcohol and ammonia or at least one lower amine, or at least one alcohol, ammonia or at least one lower amine and at least one organic co-solvent Suitable organic co-solvents include but are not limited to THF, ether and mixtures thereof.
• the dissolving metal reduction is carried out at a reduced temperature and at a ratio of nitrogen containing base to alcohol at which the reduction or dehalogenation of the protected aromatic ring is prevented.
• a presently preferred ratio of alcohol to nitrogen containing base is about 1:1 to about 1:4.
• the reaction temperature is typically maintained at about -30 0 C or lower.
• formula 6 is suspended in ethanol/ammonia and cooled to about -70 C under nitrogen. NaOEt is added, followed by cut sodium metal. Upon completion, the reaction mixture is allowed to warm, the reaction is quenched and a suspension of compound of Formula 7 is recovered.
• Formula 7 is reacted with at least one formic acid ester to form Formula 8.
• Suitable formic acid esters include HCO 2 Pr, HCO 2 Et, HCO 2 Bn, HCO 2 Me, HCO 2 nBu, HCO 2 Ph and mixtures thereof.
• Formula 8 is suspended in HCO 2 Pr and heated to reflux. After the solvent is removed, a powder residue comprised of the compound of Formula 8 remains.
• the compound of Formula 8 may be used in the subsequent process step.
• Formula 8 is hydrolyzed to form a compound of Formula 9. Suitable hydrolysis reactions include aqueous acetic acid, or other aqueous acids at a controlled pH, as are well known in the art. In an illustrative embodiment, Formula 8 is mixed with formic acid and the compound of Formula 9 is then extracted with ethyl acetate.
• Formula 9 is then converted to formula 10 under Grewe cyclization conditions.
• the Grewe method is an acid catalyzed ring closure of a substituted tetrahydroisoquinoline to the corresponding morphinan ring system, as is well known in the art.
• Suitable acid medium include but are not limited to methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, sulfuric acid, trifluoroacetic acid, trifluoromethanesulfonic acid, phosphoric acid and mixtures thereof.
• the acidic media may consist of a Lewis acid in solution such as boron trifluoride etherate.
• formula 9 is dissolved in CHCl 3 and added to the acidic medium chosen from the group including but not limited to methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, sulfuric acid, trifluoroacetic acid, trifiuoromethanesulfonic acid, phosphoric acid and mixtures thereof.
• the acidic medium chosen from the group including but not limited to methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, sulfuric acid, trifluoroacetic acid, trifiuoromethanesulfonic acid, phosphoric acid and mixtures thereof.
• X is a halogen and R is H, alkyl, acyl, aryl or R is selected from the group consisting of formyl, COR", COOR", Bn(benzyl), alkyl(methyl), and sulfonamide SO 2 CH 2 COPh.
• X is a halogen and R is H, alkyl, acyl, aryl, formyl, COR", COOR",
• Example 1 The crude product of Example 1 was suspended in 48% HBr and heated to 90 0 C for form a brown solution. It was stirred at 9O 0 C for 6 h, heated at 100 0 C for 3 h and then cooled to room temperature. The suspension was left stirring over the weekend. The mixture was filtered and the recovered solid was washed with water (600 mL). The solid was dried in flowing air for 4 h to give 256 g of solid. It was dissolved in refluxing ethyl acetate (1000 mL). 100 grams of activated carbon was added. The mixture was refluxed for another 10 minutes and filtered hot. The filter was washed with hot ethyl acetate (250 mL x2). The combined organic solutions were taken to dryness under vacuum, and the product (156.05 g) was recovered as off white solid.
• Example 4 The compound of Example 4 (56.2 g) was dissolved in POC1 3 /ACN (50 mL/250 mL) at 5O 0 C for 1 hour and then refluxed for 1 hour. The solution was taken to dryness under vacuum. It was re-dissolved in ACN (350 mL) and poured into water (500 mL). The mixture was heated to reflux and the pH was adjusted to 3-4. The heating at reflux was continued for 18 hours. 350 mL solvent was removed by distillation. The solution was cooled to 8O 0 C. ACN (50 mL) was added and further cooling of the solution to 10 0 C provided crystals. The crystals were separated by filtration. The solid was washed with water (100 mL x2, 50 mL) and dried under an air flow overnight to give 44.2 g of solid.
• Example 6 The crude product yield of Example 6 (265 g) was suspended in 48% HBr (1000 mL) and heated at 95°C for 1 hour and then taken to reflux for 3 hours. A crystalline solid formed on cooling to 5°C. The crystals were separated by filtration. The crystals were washed with water (200 mL, 150 mL) and dried under house vacuum at 7O 0 C for 3 hours to give 158.5 g of product.
• Example 9 Preparation of formula 18 [0083] The compound of Example 7 (101.3 g, 0.5 mmol) was heated to reflux in
• Example 9 The compound of Example 9 (150 g) was dissolved in POC1 3 /ACN (163 mL/750 mL) at 50C for 1 hour and then refiuxed for 1 hour. An oily material was recovered after the volatiles were removed under reduced pressure. The oil was re-dissolved in ACN (750 mL) and poured into water (1500 mL). The mixture was heated to reflux and the pH was adjusted to 4-5. Heating at reflux was continued for 22 hours. Once the solvent (850 mL) had been removed by distillation, the solution was cooled down to 8O 0 C. After the ACN (150 mL) was added, the solution was allowed to cool to 1O 0 C to give crystals. The crystals were separated by filtration. The solid was washed with water (500 mL x2) and was dired under a flow of air overnight to give 131.5 g product as a solid.
• Example 10 The compound formed in Example 10 (100.0 g) was refiuxed in EtOH (1000 mL).
• the reaction was quenched with HCO 2 H/H 2 O and NH 4 C1/H 2 O to pH 6 to 8 and then diluted to a total volume of 2000 mL with water.
• the suspension was stirred for 30 minutes and filtered.
• the solid obtained was washed with water (150 mL x4) and was dried under a flow of air overnight to give the product as powder, 25.3 g.
• Example 8 The compound of Example 8 (24 g) was suspended in HCO 2 Pr (850 mL) and heated to reflux for 3 hours. The solvent (550 mL) was removed by distillation. The remaining suspension with stirring was allowed to cool to RT over a 30 minute period. The solids were separated by filtration and then washed with ether (50 mL x4) followed by hexane (50 mL x2). After drying under an air flow for 2 hours, the product remained as a powder, 21.3 g. Another 3.63 g of product was recovered by removing the volatiles under vacuum from the combined filtrates and washes.
• Example 13 The compound of Example 13 (1.0 g) was stirred in 88% HCO 2 HZH 2 O (12 mL) for 30 minutes to form a brown solution. The solution was diluted further with water (50 mL) and extracted with ethyl acetate (25 mL x2). The combined organic layers were washed with water (25 mL x3) and the volatile components removed under vacuum. The remaining solid was redissolved in ethyl acetate followed y removal of the solvent under reduced pressure to afford 0.80 g of product as a solid.
• Example 14 The pre-cyclized intermediate of Example 14 (1.00 g) was dissolved in CHCl 3 (20 mL) and added over 15 minutes to trifluoromethanesulfonic acid (5mL) cooled to about - 4O 0 C to -2O 0 C. This reaction mixture was allowed to warm to RT and stir overnight. The mixture was diluted with 200 mL H 2 O and 200 mL ethyl acetate. NH 4 OH (28%) was added to adjust pH to 8.5 and stirred for 2 hours. HCO 2 H was added until pH was 4. After stirring for 0.5 hour, the phases were separated. The water layer was extracted with ethyl acetate (100 mL). The combined organic layers were washed with 0.01 N HCl (200 mL x3) dried over K 2 SO 4 and filtered. After the solvents were removed under reduced pressure, 1.05 g of solid remained. The product was isolated from the mixture by HPLC.
• Formula 27 was prepared according to Example 13 with F as the halogen.
• Formula 28 was prepared according to Example 12, with F as the halogen.
• Example 18 Preparation of Formula 29 [00102]
• Formula 29 is prepared according to Example 14, substituting the N-formyl group with a free amino group for the compound of Example 13.
• Example 13 The compound of Example 13 (0.50 g) was dissolved in MeSO 3 H (5 mL) and allowed to stand for 2.5 h before addition to a solution OfNH 4 OH in MeOH (100 mL). The pH was adjusted to 4. The mixture was diluted with water (100 mL) and extracted with ethyl acetate (2 X 100 mL). The combined organic layers were washed with NaH 2 PO 4 solution (2 X 100 mL), dried over Na 2 SO 4 and filtered. The filtered solution was placed under vacuum to remove the volatile solvents. 0.52 Gram of solid crude product remained. HPLC analysis of the crude indicated that the solid contained 90% ⁇ , ⁇ -ketone, Formula 30.
• Formula 31 is a byproduct of the acid-catalyzed rearrangement of compound formed in Example 19.
• Formula 32 is a byproduct of the acid-catalyzed rearrangement of the compound formed in Example 18.

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