Addition of vinylmagnesium bromide across chiral α-chloro N-tert-butanesulfinyl ketimines afforded 3-aryl-1-(tert-butanesulfinyl)-3-pyrrolines in high yield (65-91%) after purification by means of recrystallization from diethyl ether. The synthesis of these 3-aryl-3-pyrrolines is explained by initial formation of 2-aryl-2-vinylaziridines which spontaneously rearrange via carbon-nitrogen bond cleavage to form stabilized 1,3-dipolar intermediates which in turn ring closed to 3-pyrrolines.
在手性δ-
氯 N-叔丁基亚磺
酰亚胺上加入
乙烯基溴化镁,通过从二
乙醚中重结晶提纯后,可以得到 3-芳基-1-(叔丁基亚磺
酰亚胺基)-3-
吡咯烷,收率高达 65-91%。这些 3-芳基-
3-吡咯啉的合成是通过 2-芳基-2-
乙烯基氮丙啶的初始形成来解释的,这些 2-芳基-2-
乙烯基氮丙啶通过碳氮键裂解自发地重排,形成稳定的 1,3-二极中间体,进而环闭生成
3-吡咯啉。