(3S,4R,2'R,3'R,1''E)-3-(3'-hydroxy-2'-methyl-1'-oxohex-5'-enyl)-4-(3''-hydroxy-2''-methylprop-1''-enyl)-3-methyl-1-oxopropylazetidin-2-one 在
silica gel 作用下,
以
乙醚 为溶剂,
以75%的产率得到(3S,5R,6R,1'R,2'E)-3-(4'-hydroxy-3'-methyl-1'-propanoylaminobut-2'-enyl)-3,5-dimethyl-6-prop-2''-enyltetrahydropyran-2,4-dione