N-tert.-Butyloxycarbonyl-cysteinyl-S-diphenylmethyl-cysteinyl-alanyl-glycyl-valyl-cysteinyl-alanyl-leucin-tert.-butylester 在
1,1-二碘乙烷 作用下,
以
甲醇 、
N,N-二甲基甲酰胺 为溶剂,
反应 16.0h,
以78%的产率得到N-tert.-Butyloxycarbonyl-hemicystinyl-S-diphenylmethyl-cysteinyl-alanyl-glycyl-valyl-hemicystinyl-alanyl-leucin-tert.-butylester