(2S,5R,6R)-6-methoxy-6-methyl-2-(1'-methylethyl)-1,4-diazabicyclo<3.2.0>heptan-7-one 在
camphor-10-sulfonic acid 作用下,
以
二氯甲烷 为溶剂,
反应 1.5h,
以95%的产率得到(3S,6R,10S,13R)-6,13-dimethyl-3,10-bis(1'-methylethyl)-6,13-dimethoxy-1,4,8,11-tetraazacyclotetradeca-7(E),14(E)-diene-5,12-dione