(R)-(R)-2-(2,2-difluoropent-4-enamido)-2-phenylethyl-2-methylpent-4-enoate 、 在
(3R,11R,E)-6,6-difluoro-11-methyl-3-phenyl-1-oxa-4-azacyclododec-8-ene-5,12-dione 作用下,
以
甲苯 为溶剂,
以to yield the desired product as a white solid (81 mg, 84%) after column chromatography (EtOAc/hexanes gradient)的产率得到(3R,11R,E)-6,6-difluoro-11-methyl-3-phenyl-1-oxa-4-azacyclododec-8-ene-5,12-dione