Oxidation of sp3 C H bonds in N-alkylhydrazides: Access to 2,5-disubstituted 1,3,4-oxadiazole derivatives
摘要:
The oxidation of sp(3) C-H bonds in N-alkylhydrazides was achieved en route to the efficient synthesis of a broad series of 1,3,4-oxadiazoles. Mechanistic studies have revealed that N-acylhydrazone is a key intermediate in this catalytic transformation. (C) 2016 Elsevier Ltd. All rights reserved.
Phase-Transfer Catalyzed Synthesis of Amides and Esters of Carboxylic Acids
作者:Zsuzsa M. Jászay、Imre Petneházy、László Töke
DOI:10.1055/s-1989-27380
日期:——
A convenient one-pot procedure is reported for the preparation of carboxamides and carboxylic acid esters from carboxylic acids and amines or alcohols, respectively. The carboxylic acids are activated by sulfonyl chlorides under solid-liquid phase-transfer conditions using solid potassium carbonate as base and a lipophilic quaternary ammonium salt as catalyst.
The oxidation of sp(3) C-H bonds in N-alkylhydrazides was achieved en route to the efficient synthesis of a broad series of 1,3,4-oxadiazoles. Mechanistic studies have revealed that N-acylhydrazone is a key intermediate in this catalytic transformation. (C) 2016 Elsevier Ltd. All rights reserved.