{(S)-1-[(2S,7S,10S)-15-Benzyloxy-2-(2-benzyloxy-phenyl)-4-cyano-2-hydroxymethyl-7-isopropyl-9-oxo-17-oxa-5,8-diaza-tricyclo[10.3.1.13,6]heptadeca-1(16),3,5,12,14-pentaen-10-ylcarbamoyl]-2-methyl-propyl}-carbamic acid benzyl ester 在
(+)-10-camphorsulfonic acid 作用下,
以
苯 为溶剂,
反应 6.5h,
以81%的产率得到benzyl ((S)-1-(((17S,4S,7S)-26-(benzyloxy)-17-(2-(benzyloxy)phenyl)-7-isopropyl-14,5-dioxo-16,17-dihydro-14H-6-aza-1(7,2)-pyrano[3,4-d]oxazola-2(1,3)-benzenacycloheptaphane-4-yl)amino)-3-methyl-1-oxobutan-2-yl)carbamate