Sequential addition reaction of lithium acetylides and Grignard reagents to thioiminium salts from thiolactams leading to 2,2-disubstituted cyclic amines
作者:Toshiaki Murai、Rie Toshio、Yuichiro Mutoh
DOI:10.1016/j.tet.2006.04.065
日期:2006.6
The reaction of thioiminium salts derived from γ- and δ-thiolactams with lithium acetylides and Grignard reagents proceeded sequentially to give 2,2-disubstituted pyrrolidines and piperidines in moderate to high yields. In the initial step of the reaction, 2-(methylthio)pyrrolidines and -piperidines may be formed. The use of lithium (trimethylsilyl)acetylide gave the products most effectively. Aryl-
由γ-和δ-硫代内酰胺衍生的硫代亚胺盐与乙炔锂和格利雅试剂的反应依次进行,以中等至高收率得到2,2-二取代的吡咯烷和哌啶。在反应的初始步骤中,可以形成2-(甲硫基)吡咯烷和-哌啶。(三甲基甲硅烷基)乙炔化锂的使用最有效地获得了产物。芳基,烷基和烯丙基镁的卤化物用作格氏试剂。在催化量的Rh 4(CO)12存在下,用HSiMe 2 Ph进行N-烯丙基2-乙炔基环胺的甲硅烷基碳环化反应,得到三取代的六氢-1 H-吡咯嗪和八氢吲哚并。