Dichloromethane → HCID 58946306, compound

Participants

Reaction Conditions

Reaction Steps

(2R)-1-Acetoxy-2-acetylamino-2-methyl-4-{1-methyl-5-[4-(4-cyanolphenyl)-1-(4-(4-cyanophenyl)butanoyloxy)but-1-enyl]pyrrol2-yl}butane (4.10 g, 6.90 mmol) obtained in Example 10 (10a) was dissolved in a mixture of tetrahydrofuran (10 mL) and methanol (10 mL), and water (10 mL) and lithium hydroxide monohydrate (2.90 g, 69 mmol) were added thereto, followed by stirring of the mixture at 80° C. for 1 hour. After cooling, water and methylene chloride were added to the reaction mixture to separate it. The thus obtained organic phase was separated, washed with a saturated aqueous NaCl solution and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by basic silica gel (NH type) chromatography (methylene chloride:methanol, 100:1) to obtain (2R)-2-amino-2-methyl-4-{1-methyl-5-[4-(4-cyanophenyl)butanoyl]pyrrol-2-yl}butan-1-ol (1.90 g, yield: 79%). A solution of fumaric acid (0.630 g, 5.40 mmol) in methanol (10 mL) was added to a solution of the thus obtained (2R)-2-amino-2-methyl-4-{1-methyl-5-[4-(4-cyanophenyl)butanoyl]pyrrol-2-yl}butan-1-ol (1.90 g, 5.40 mmol) in methanol (10 mL) under ice-cooling. After methanol was evaporated under reduced pressure, the residue was dissolved in a small amount of methanol, ethyl acetate was added thereto and recrystallization was carried out to obtain a crude crystal (1.29 g) of the title compound. Recrystallization of the thus obtained crude crystal (1.29 g) was carried out again using methanol to obtain the title compound (1.01 g, yield: 45%) as a white crystal.

Provenance & Evidence