Synthesis of the dibenzopyrrocoline alkaloid skeleton: indolo[2,1-a]isoquinolines and related analogues
作者:Angelique N.C. Lötter、Rakhi Pathak、Thato S. Sello、Manuel A. Fernandes、Willem A.L. van Otterlo、Charles B. de Koning
DOI:10.1016/j.tet.2006.12.063
日期:2007.3
indole or pyrrole nucleus, aromatic rings containing a carbonyl substituent ortho to the newly formed biaryl axis were introduced using the Suzuki–Miyaura coupling reaction. Thereafter, under basic conditions the nucleophile that formed at the acidic methylene protons of the N-benzylindole, ethyl 1H-indol-1-ylacetate or N-benzylpyrrole intermediate reacted with the internal aromatic carbonyl to yield (after
吲哚[2,1- a ]异喹啉和吡咯并[2,1- a ]异喹啉核分别由N-苄基吲哚或1H-吲哚-1-基乙酸乙酯和N-苄基吡咯前体合成。首先,在吲哚或吡咯核的C-2处,使用Suzuki-Miyaura偶联反应引入了在新形成的联芳基轴上邻位有羰基取代基的芳环。此后,在碱性条件下,在N-苄基吲哚,1 H-吲哚-1-基乙酸乙酯或N的酸性亚甲基质子上形成的亲核试剂-苄基吡咯中间体与内部芳族羰基反应以产生(在排出水之后)标题化合物。例如,将2-(2-(2-甲酰基苯基)-1 H-吲哚-1-基)乙酸乙酯暴露于叔丁醇钾导致乙基吲哚[2,1 - a ]异喹啉-6-的形成。羧酸盐。