Preparation of Substituted Alkylpyrroles via Samarium-Catalyzed Three-Component Coupling Reaction of Aldehydes, Amines, and Nitroalkanes
作者:Hiroyuki Shiraishi、Takayuki Nishitani、Satoshi Sakaguchi、Yasutaka Ishii
DOI:10.1021/jo980435t
日期:1998.9.1
synthesized by three-component coupling reaction of aldehydes, amines, and nitroalkanes in the presence of a catalytic amount of a samarium species under mild conditions. The reaction is considered to involve the coupling of alpha,beta-unsaturated imines, which are provided by the samarium-catalyzed aldol-type condensation of imines generated from amines and aldehydes, with nitroalkanes. In the case of the three-component
在温和条件下,在催化量的species物种的存在下,通过醛,胺和硝基烷的三组分偶联反应合成吡咯。该反应被认为涉及α,β-不饱和亚胺的偶联,其是由sa催化的由胺和醛产生的亚胺的亚胺的醛醇缩醛型缩合与硝基烷烃偶联而成的。在α,β-不饱和醛(或酮)与胺和硝基烷烃的三组分偶联的情况下,仅在不存在任何催化剂的情况下加热获得烷基吡咯。例如,使丁胺,2-丁烯基环己酮和硝基乙烷的混合物在60摄氏度下反应15小时,生成异吲哚4r,其产率为39%,这是常规方法难以制备的。