Synthesis of tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols
作者:Haiting Yin、Qin Ma、Yushan Wang、Xiaoxia Gu、Zhijun Feng、Yunjun Wu、Ming Wang、Shaoyin Wang
DOI:10.1039/d1ra03022a
日期:——
A facile and efficient route to tetrahydro-β-carbolines from 2-indolylmethyl azides and propargylic alcohols via acid-catalyzed dehydrative annulation reactions is described. This reaction proceeds through a cascade sequence of Friedel–Crafts-type alkylation followed by intramolecular “Click” reaction, involving the formation of multiple chemical bonds in a single operation with excellent atom-economy
(±)-CSA catalyzed Friedel–Crafts alkylation of indoles with 3-ethoxycarbonyl-3-hydoxyisoindolin-1-one: an easy access of 3-ethoxycarbonyl-3-indolylisoindolin-1-ones bearing a quaternary α-amino acid moiety
For the first time, a very simple, efficient, mild, catalytic, and one-step procedure for the synthesis of a series of new 3-ethoxycarbonyl-3-indolylsubstituted-isoindol-1-one derivatives has been achieved via a Friedel-Crafts alkylation of indoles with 3-hydroxy-3-ethoxycarbonylisoindolin-1-one at room temperature using easily available inexpensive camphor-10-sulfonic acid as an organocatalyst. The current protocol provides good to excellent yields of the title compounds with high substrate scope. In addition, the desired product possesses a chiral quaternary carbon center at the 3-position on isoindolin-1-one ring which is flanked by indole moiety, amino and ester groups for further elaborations. (C) 2013 Elsevier Ltd. All rights reserved.
Phosphine-mediated cascade reaction of azides with MBH-acetates of acetylenic aldehydes to substituted pyrroles: a facile access to N-fused pyrrolo-heterocycles
One-pot synthesis of substituted pyrroles by a cascade reaction of azides with Morita–Baylis–Hillmanacetates of acetylenic aldehydes is described and the reaction is efficiently mediated by triphenyl phosphine at room temperature. Sodium azide is successfully used to provide N-unsubstituted pyrroles, while alkyl azides afforded the corresponding N-alkylated pyrroles through a sequence of allylic substitution/azide