Synthesis of 1,2,3-Trisubstituted Pyrrolidines and 2,3-Disubstituted Tetrahydrofurans via Diastereoselective Reductive Cyclization of γ-Chloroimines and γ-Chloroketones
作者:Norbert De Kimpe、Mudiganti Sastry、Sven Mangelinckx、Bart Lucas
DOI:10.1055/s-0031-1289544
日期:2011.12
involves reductive cyclization of gamma-chloroketimines, which were generated in situ from the reaction of 3-substituted 5-chloro-2-pentanones and a primary amine. Various reduction conditions were explored to induce a diastereoselective reductive cyclization. 2,3-Disubstituted tetrahydrofurans were obtained by the direct reduction of 3-substituted 5-chloro-2-pentanones with sodium borohydride.
描述了一种新的非对映选择性合成方法,用于 1,2,3-三取代吡咯烷和 2,3-二取代四氢呋喃。吡咯烷的合成涉及γ-氯酮亚胺的还原环化,γ-氯酮亚胺是由3-取代的5-氯-2-戊酮和伯胺反应原位生成的。探索了各种还原条件以诱导非对映选择性还原环化。2,3-二取代的四氢呋喃是通过用硼氢化钠直接还原 3-取代的 5-氯-2-戊酮获得的。