2-Bromo-3-oxobutyric acid tert-butyl ester → (R)-4-(5-tert-butoxycarbonyl-4-methyl-thiazol-2-yl)-2-(4-propyl-benzylcarbamoyl)-piperazine-1-carboxylic acid benzyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of the compound (1.51 g) obtained in Step 4 and 2-bromo-3-oxobutyric acid tert-butyl ester (1.58 g) in acetonitrile (15 ml) was stirred at 80° C. for 15 min. The reaction mixture was concentrated under reduced pressure, and the residue was partitioned by adding ethyl acetate and water. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, filtrated, and concentrated under reduced pressure. The residue was purified by column chromatography (ethyl acetate:n-hexane=1:2-2:3) to give the title compound (1.29 g).

Provenance & Evidence