H2N-D-Glu(OtBu)-D-Cys(STrt)-D-Val-Gly-OMe 、
(3S,4E)-3-hydroxy-1-((4R)-4-isopropyl-2-thioxothiazolidin-3-yl)-7-tritylsulfanyl-hept-4-en-1-one 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 18.0h,
以44%的产率得到(R)-4-((E)-(S)-3-hydroxy-7-tritylsulfanyl-hept-4-enoylamino)-4-{(S)-1-[(R)-1-(methoxycarbonylmethyl-carbamoyl)-2-methyl-propylcarbamoyl]-2-tritylsulfanyl-ethylcarbamoyl}-butyric acid tert-butyl ester