α-Chloroethers such as chloromethyl alkyl ethers or 1,3,3-trichloro-1-isobutoxyprop-2-ene react with trimethylsilyl-N,N-dialkylamines to give the Mannich-reagent and new 3,3-dichloroprop-2-en-1-ylidene-N,N-dialkyliminium chlorides (vinylogous Viehe-reagents), respectively. Extension of this method leads to the reagent system trimethylsilyl-N,N-dialkylamine/trimethylsilylchloride or -triflate, which
α-
氯醚(如
氯甲基烷基醚或1,3,3-三
氯-1-异丁氧基丙-2-烯)与三甲基甲
硅烷基-N,N-二烷基胺反应生成曼尼希试剂和新的3,3-
二氯丙-2-烯-1-亚甲基-N,N-二烷基
亚胺氯化物(vinylogous Viehe-试剂)。该方法的扩展导致试剂系统三甲基甲
硅烷基-N,N-二烷基胺/三甲基甲
硅烷基
氯化物或-
三氟甲磺酸盐,其允许羰基化合物直接转化为
亚胺盐。