Acetic acid (3E,9E)-(1R,11S,14S)-16-benzyl-14-methyl-6,18-dioxo-13-trimethylsilanylmethyl-17-aza-tricyclo[9.7.0.01,15]octadeca-3,9,12-trien-2-yl ester 在
boron trifluoride diacetate 作用下,
以
二氯甲烷 为溶剂,
以80%的产率得到Acetic acid (3E,9E)-(1R,2R,11R,14S)-16-benzyl-14-methyl-13-methylene-6,18-dioxo-17-aza-tricyclo[9.7.0.0
1,15]octadeca-3,9-dien-2-yl ester