Abstract Treatment of O‐alkylhydroxylamine hydrochlorides with 2‐acyl‐4,5‐dichloropyridazin‐3(2H)‐ones in the presence of triethylamine or Amberlite® IRA‐67 in acetonitrile gave corresponding O‐alkylhydroxamic acid derivatives in excellent yields. This is an efficient, convenient, and eco‐friendly method.
ZnCl<sub>2</sub>‐Mediated Synthesis of Carboxylic Anhydrides using 2‐Acyl‐4,5‐dichloropyridazin‐3(2<i>H</i>)‐ones
作者:Yong‐Dae Park、Jeum‐Jong Kim、Ho‐Kyun Kim、Su‐Dong Cho、Young‐Jin Kang、Ki Hun Park、Sang‐Gyeong Lee、Yong‐Jin Yoon
DOI:10.1081/scc-200048939
日期:2005.1.1
Abstract ZnCl2 is an efficient catalyst for synthesis of carboxylicacidanhydridefrom 2‐acyl‐4,5‐dichloropyridazin‐3(2H)‐ones. Treatment of 2‐acyl‐4,5‐dichloropyridazin‐3(2H) ‐ones with ZnCl2 (0.5 equivalents) and air in refluxing dry THF or acetonitrile gave the corresponding symmetric acidanhydrides in good to excellent yield.
2-Acyl-4,5-dichloropyridazin-3-ones served as excellent novel N-acylating reagents for amines under neutral conditions in organic solvent. They are convenient, chemoselective and easy to handle stable N-acylating reagentsof amines.
Facile Synthesis of Symmetric and Unsymmetric 1,3,4-Oxadiazoles Using 2-Acyl(or aroyl)pyridazin-3-ones
作者:Yong-Jin Yoon、Yong-Dae Park、Jeum-Jong Kim、Hyun-A Chung、Deok-Heon Kweon、Su-Dong Cho、Sang-Gyeong Lee
DOI:10.1055/s-2003-37647
日期:——
Symmetric and unsymmetric 1,3,4-oxadiazoles were synthesized in situ from hydrazine hydrate and the corresponding 2-acyl-4,5-dichloropyridazin-3-ones as acylating agents in polyphosphoric acid or BF 3 OEt 2 in excellent yields.