A mild method for the replacement of a hydroxyl group by halogen: 3. the dichotomous behavior of α-haloenamines towards allylic and propargylic alcohols
作者:François Munyemana、Luc Patiny、Léon Ghosez
DOI:10.1016/j.tet.2021.132148
日期:2021.6
tetramethyl-α-halo-enamines is reported. Primary allylic and primary and secondary propargylic alcohols gave the corresponding halides in high yields. Secondary allylic and propargylic alcohols yielded the corresponding secondary halides but the reaction also produced some rearranged primary halides (I > Br > Cl). The reactions with tertiary allylic and tertiary propargylic alcohols gave several products and was
报告了烯丙醇和炔丙醇与四甲基-α-卤代烯胺脱氧卤化的研究。伯烯丙醇和伯和仲炔丙醇以高产率得到相应的卤化物。仲烯丙醇和炔丙醇产生相应的仲卤化物,但该反应也产生了一些重排的伯卤化物(I > Br > Cl)。与叔烯丙醇和叔炔丙醇的反应产生了几种产物,因此几乎没有合成价值。然而,向反应混合物中加入三乙胺或使用醇锂代替醇导致反应过程发生重大变化,导致在 C 2 上带有烯丙基或烯丙基的酰胺。. 这被证明是由中间体 α-烯丙氧基-或炔丙氧基-烯胺的 Claisen-Eschenmoser 重排引起的。