ketene aminals 4a-c which were generated in situ by selenoxide elimination of the aminal precursors 3a-c in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene gave the monocyclic unsaturated medium ring lactams 5a-c.
在1,8-二
氮杂双环[5.4.0]
十一烷基-7-烯的存在下通过亚
硒酸酯消除
氨基前体3a-c而原位产生的
乙烯基取代的
乙烯酮缩醛胺4a-c的克莱森重排得到了单环不饱和基团。中环内酰胺5a-c。