(3aS,7aR)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 17.0 g (157 mmoles) of 4-aminomethylpyridine was added 40 mL of dimethylformamide and 24.2 g (157 mmoles) of cis-1,2-cyclohexanedicarboxylic anhydride. The mixture was heated under reflux for 2 hours. The cooled solution was diluted with water, made basic with aqueous potassium hydroxide, and extracted with ethyl acetate. The organic extracts were washed with saturated sodium bicarbonate solution and saturated sodium chloride solution, dried and evaporated to afford 16.8 g of 2-(4-pyridinylmethyl)-cis-3a,4,5,6,7,7a-hexahydro-1H-isoindole-1,3(2H)-dione, m.p. 91°-92°; NMR (CDCl3): δ8.53-8.63 (d, 2H); 7.19-7.29 (d, 2H); 4.63 (s, 2H); 2.80-3.00 (m, 2H); 1.78-2.00 (m, 2H); 1.63-1.78 (m, 2H); 1.33-1.58 (m, 4H). The mixture was heated under reflux for 2 hours extracted with ethyl acetate The organic extracts were washed with saturated sodium bicarbonate solution and saturated sodium chloride solution dried evaporated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(4-aminobutyl)-4-(6-Fluoro-1,2-benzisoxazol-3-yl)piperidine (4.7 g, 16.1 mmol) and cis-1,2-cyclohexanedicarboxylic anhydride (3.23 g, 21 mmol) in pyridine (45 ml) was heated at reflux for 8 hours. At the end of the reaction, pyridine was removed to dryness. The crude product was purified on a silica gel column. The material thus obtained weighed 3.18 g (45%) as a clear oil. This oil was dissolved in ethanol (15 ml), then was treated with HCl in ethanol (45 ml). Crystallization took place upon cooling. The crystals were collected, 3.2 g, m.p.=229-231° C. was heated at reflux for 8 hours was removed to dryness The crude product was purified on a silica gel column The material thus obtained Crystallization upon cooling The crystals were collected

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(3-aminopropyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (3.01 g, 10.8 mmol) and cis-1,2-cyclohexane-dicarboxylic anhydride (1.9 g, 12.3 mmol) in dry pyridine (30 ml) was heated at reflux for 16 hours. The dark brown solution was concentrated to dryness on a rotary evaporator. The crude residue was purified twice by flash chromatography over a silica gel column. The pure product thus obtained weighed 2.5 g (67%). This was converted to the hydrochloride salt by treatment with HCl in ethanol (50 ml). The cis-2-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propyl]-hexahydro-1H-isoindole-1,3-dione hydrochloride crystals so obtained weighed 3.0 g, m.p.=242-245° C. was heated at reflux for 16 hours The dark brown solution was concentrated to dryness on a rotary evaporator The crude residue was purified twice by flash chromatography over a silica gel column The pure product thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(3-aminopropyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (3.01 g, 10.8 mmol) and cis-1,2-cyclohexane-dicarboxylic anhydride (1.9 g, 12.3 mmol) in dry pyridine (30 ml) was heated at reflux for 16 hours. The dark brown solution was concentrated to dryness on a rotary evaporator. The crude residue was purified twice by flash chromatography over a silica gel column. The pure product thus obtained weighed 2.5 g (67%). This was converted to the hydrochloride salt by treatment with HCl in ethanol (50 ml). The cis-2-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propyl]-hexahydro-1H-isoindole-1,3-dione hydrochloride crystals so obtained weighed 3.0 g, m.p.=242°-245° C. was heated at reflux for 16 hours The dark brown solution was concentrated to dryness on a rotary evaporator The crude residue was purified twice by flash chromatography over a silica gel column The pure product thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(4aminobutyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (4.7 g, 16.1 mmol) and cis-1,2-cyclohexanedicarboxylic anhydride (3.23 g, 21 mmol) in pyridine (45 ml) was heated at reflux for 8 hours. At the end of the reaction, pyridine was removed to dryness. The crude product was purified on a silica gel column. The material thus obtained weighed 3.18 g (45%) as a clear oil. This oil was dissolved in ethanol (15 ml), then was treated with HCl in ethanol (45 ml). Crystallization took place upon cooling. The crystals were collected, 3.2 g, m.p.=229°-231 ° C. was heated at reflux for 8 hours was removed to dryness The crude product was purified on a silica gel column The material thus obtained Crystallization upon cooling The crystals were collected

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(3-aminopropyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (3.01 g, 10.8 mmol) and cis-1,2-cyclohexane-dicarboxylic anhydride (1.9 g, 12.3 mmol) in dry pyridine (30 ml) was heated at reflux for 16 hours. The dark brown solution was concentrated to dryness on a rotary evaporator. The crude residue was purified twice by flash chromatography over a silica gel column. The pure product thus obtained weighed 2.5 g (67%). This was converted to the hydrochloride salt by treatment with HCl in ethanol (50 ml). The cis-2-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propyl]-hexahydro-1H-isoindole1,3-dione hydrochloride crystals so obtained weighed 3.0 g, m.p.=242°-245° C. was heated at reflux for 16 hours The dark brown solution was concentrated to dryness on a rotary evaporator The crude residue was purified twice by flash chromatography over a silica gel column The pure product thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.281 g (1.82 mmol) of cis-1,2-cyclohexanedicarboxylic anhydride and 0.47 g of the hydrochloride salt of L-Trp-NHMe in 0.5 mL of dimethylformamide 0.51 mL of triethylamine was added at room temperature. After 2 hr of stirring the resulting mixture was diluted to 10 mL with water and 25 mL of ethyl acetate was added. The resulting mixture was acidified to pH=2 with 10% potassium bisulfate and the organic phase was washed with water (2×15 ml), saturated sodium chloride and dried over anhydrous magnesium sulfate and evaporated to dryness. The title compound 35 was purified by crystallization from an ethyl acetate-hexane mixture. Yield 48%; mp=105°-112° C.; Rf (G)=0.65, 0.61. was added at room temperature was added the organic phase was washed with water (2×15 ml), saturated sodium chloride dried over anhydrous magnesium sulfate evaporated to dryness The title compound 35 was purified by crystallization from an ethyl acetate-hexane mixture

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2 g (0.013 mol) of cis-1,2-cyclohexane-dicarboxylic anhydride in 15 mL of methanol was refluxed for 5 hr, then evaporated to dryness under reduced pressure to give 2.41 g (100% yield) of cis-2-methoxycarbonyl-cyclohexanecarboxylic acid. When this was substituted for 3 in Example 1, the identical process afforded the title compound, melting at 140°-144° C., in 36% yield; Rf (D)=0.53, 0.47. was refluxed for 5 hr evaporated to dryness under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.281 g (1.82 mmol) of cis-1,2-cyclohexanedicarboxylic anhydride and 0.47 g of the hydrochloride salt of L-Trp-NHMe in 0.5 mL of dimethylformamide 0.51 mL of triethylamine was added at room temperature. After 2 hr of stirring the resulting mixture was diluted to 10 mL with water and 25 mL of ethyl acetate was added. The resulting mixture was acidified to pH=2 with 10% potassium bisulfate and the organic phase was washed with water (2×15 ml), saturated sodium chloride and dried over anhydrous magnesium sulfate and evaporated to dryness. The title compound 35 was purified by crystallization from an ethyl acetate-hexane mixture. Yield 48%; mp=105°-112° C.; Rf (G)=0.65, 0.61. was added at room temperature was added the organic phase was washed with water (2×15 ml), saturated sodium chloride dried over anhydrous magnesium sulfate evaporated to dryness The title compound 35 was purified by crystallization from an ethyl acetate-hexane mixture

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2 g (0.013 mol) of cis-1,2-cyclohexane-dicarboxylic anhydride in 15 mL of methanol was refluxed for 5 hr, then evaporated to dryness under reduced pressure to give 2.41 g (100% yield) of cis-2-methoxycarbonyl-cyclohexanecarboxylic acid. When this was substituted for 3 in Example 1, the identical process afforded the title compound, melting at 140°-144° C., in 36% yield; Rf (D)=0.53, 0.47. was refluxed for 5 hr evaporated to dryness under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(4-aminobutyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (4.7 g, 16.1 mmol) and cis-1,2-cyclohexanedicarboxylic anhydride (3.23 g, 21 mmol) in pyridine (45 ml) was heated at reflux for 8 hours. At the end of the reaction, pyridine was removed to dryness. The crude product was purified on a silica gel column. The material thus obtained weighed 3.18 g (45%) as a clear oil. This oil was dissolved in ethanol (15 ml), then was treated with HCl in ethanol (45 ml). Crystallization took place upon cooling. The crystals were collected, 3.2 g, m.p.=229°-231° C. was heated at reflux for 8 hours was removed to dryness The crude product was purified on a silica gel column The material thus obtained Crystallization upon cooling The crystals were collected

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(4-aminobutyl)-4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (4.7 g, 16.1 mmol) and cis-1,2-cyclohexanedicarboxylic anhydride (3.23 g, 21 mmol) in pyridine (45 ml) was heated at reflux for 8 hours. At the end of the reaction, pyridine was removed to dryness. The crude product was purified on a silica gel column. The material thus obtained weighed 3.18 g (45%) as a clear oil. This oil was dissolved in ethanol (15 ml), then was treated with HCl in ethanol (45 ml). Crystallization took place upon cooling. The crystals were collected, 3.2 g, m.p.=229°-231° C. was heated at reflux for 8 hours was removed to dryness The crude product was purified on a silica gel column The material thus obtained Crystallization upon cooling The crystals were collected