(R)-4-(5-tert-butoxycarbonyl-4-methyl-thiazol-2-yl)-2-(4-propyl-benzylcarbamoyl)-piperazine-1-carboxylic acid benzyl ester → 4-methyl-2-[(R)-3-(4-propyl-benzylcarbamoyl)-piperazin-1-yl]-thiazole-5-carboxylic acid tert-butyl ester

Participants

Reaction Steps

A mixture of the compound (1.00 g) obtained in Step 5 and 7.5% palladium carbon (1.0 g) in methanol (15 ml) was stirred under a hydrogen atmosphere (5 atm) at room temperature for 4 hr. The reaction mixture was filtered through celite, and concentrated under reduced pressure. 10% Palladium carbon (500 mg) and methanol (15 ml) were added again to the residue, and the mixture was stirred under a hydrogen atmosphere (5 atm) at room temperature for 6 hr. The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography (3%-5% methanol/chloroform) to give the title compound (688 mg).

Provenance & Evidence