(S,S)-5-bromo-3-{3-methyl-2-[(2-phenoxy-ethylcarbamoyl)-methyl]-butyrylamino}-4-oxo-pentanoic acid,tert-butyl ester 、
(S)-1,1-dimethylethyl[[(7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl)methyl]sulfonyl]carbamate 在
potassium tert-butylate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 0.5h,
以64%的产率得到1,1-dimethylethyl 5-[[(1,1-dimethylethoxy)carbonyl][[(7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl)methyl]sulfonyl]amino]-3-[[2-(1-methylethyl)-1,4-dioxo-4-[(2-phenoxyethyl)amino]butyl]amino]-4-oxopentanoate