Mild and convenient one-pot synthesis of 1,3,4-oxadiazoles
摘要:
A mild, general, convenient, and efficient one-pot synthesis of 2-phenyl-5-substituted-1,3,4-oxadiazoles is described. Both (hetero)aryl and alkyl carboxylic acids were efficiently condensed with benzohydrazide in the presence of TBTU to give diacylhydrazine intermediates. The latter underwent a smooth TsCl-mediated cyclodehydration reaction to afford 2-phenyl-5-substituted-1,3,4-oxadiazoles in good to very good yields. (C) 2010 Elsevier Ltd. All rights reserved.
Hypervalent Iodine Oxidation of Acid Hydrazides: A New Synthesis of<i>N,N</i>′-Diacylhydrazines
作者:Om Prakash、Vijay Sharma、Anil Sadana
DOI:10.1080/00397919708005637
日期:1997.10
Abstract Hypervalent iodine oxidation of p-substituted benzohydrazides (1a-h), phenylacetohydrazide (1i) and heterocyclic acid hydrazides (1j-I) using one equivalent of iodobenzene diacetate in dry dichloromethane or acetonitrile leads to dimerization thereby providing a new and facile method for the synthesis of N,N-diacylhydrazines 2.