Expeditious Route Towards (±)-Desethyleburnamonine, a Precursor of (±)-Vindeburnol
作者:Laurence Jung-Deyon、Bruno Giethlen、André Mann
DOI:10.1002/ejoc.201101058
日期:2011.11
An expeditious route to (±)-desethyleburnamonine (1), a direct precursor of vindeburnol, is reported. Microwave irradiation of an indolo-tetrahydropyridine ethyl ester 2 in CH3CN in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) gave the pentacyclic (±)-desethyleburnamonine in a one-pot process. Experimental evidence support an allylamine–enamine isomerization, followed by a rare Pictet–Spengler
报道了一种快速途径 (±)-desethyleburnamonine (1),vindeburnol 的直接前体。在 1,8-二氮杂双环 [5.4.0] 十一碳-7-烯 (DBU) 存在下,在 CH3CN 中对吲哚-四氢吡啶乙酯 2 进行微波照射,在一锅法中得到五环 (±)-去乙基勃胺。实验证据支持烯丙胺-烯胺异构化,然后在碱性介质中发生罕见的 Pictet-Spengler 缩合。从可商购的 3-(2-溴-乙基) 吲哚和乙基吡啶-3-基乙酸酯中,经过三个步骤以 52% 的产率获得了 (±)-去乙基本胺。