Reductive deprotection of allyl, benzyl and sulfonyl substituted alcohols, amines and amides using a naphthalene-catalysed lithiation
摘要:
The reaction of different protected alcohols, amines and amides with lithium and a catalytic amount of naphthalene (4 mol %) in THF at low temperature leads to their deprotection under very mild reaction conditions, the process being in many cases chemoselective. (C) 1997 Elsevier Science Ltd.
A new synthetic entry to the 1,4-dihydroquinoline nucleus is reported. The procedure involves the dimethyltitanocene methylenation of N-(alkoxycarbonyl)amides derived from 2-allylanilines, followed by ring-closing metathesis of the resulting enamides. (c) 2005 Elsevier Ltd. All rights reserved.
Reductive deprotection of allyl, benzyl and sulfonyl substituted alcohols, amines and amides using a naphthalene-catalysed lithiation
作者:Emma Alonso、Diego J. Ramón、Miguel Yus
DOI:10.1016/s0040-4020(97)00920-4
日期:1997.10
The reaction of different protected alcohols, amines and amides with lithium and a catalytic amount of naphthalene (4 mol %) in THF at low temperature leads to their deprotection under very mild reaction conditions, the process being in many cases chemoselective. (C) 1997 Elsevier Science Ltd.
A new and efficient method for the facile synthesis of N-acyl sulfonamides under Lewis acid catalysis
sulfonamides with carboxylic acid anhydrides in the presence of Lewisacids is described. Several Lewisacids such as BF3·Et2O, ZnCl2, MoCl5, TiCl4, B(C6F5)3, Sc(OTf)3 and I2 were found to catalyze the reactionefficiently to furnish the N-acylated products in good yields undersolvent-freeconditions. The reactions of various sulfonamides were studied with different carboxylic acid anhydrides including the