A disfavored 5-endo-trig cyclization is accomplished in gem-difluoroolefins with sp3 carbon nucleophiles, generated via the lithium–iodine exchange reaction of 1,1-difluoro-5-iodo-1-pentenes with tert-butyllithium, to afford 1-fluorocyclopentenes.
在宝石二
氟烯烃中,通过1,1-二
氟-
5-碘-1-戊烯与
叔丁基锂的
锂-
碘交换反应生成具有sp3碳亲核体的5-内型三联环,从而完成不受欢迎的5-内型三联环化反应,生成
1-氟环戊烯。