Eco-friendly atom-economical synthesis of 2-substituted-benzo[d]thiazoles and 2-substituted-benzo[d]oxazoles using 2-acylpyridazin-3(2H)-ones
摘要:
Efficient and green syntheses of heterocycles are of great importance. In this work, we have demonstrated the synthesis of benzo[d]thiazoles and benzo[d]oxazoles using 2-acylpyridazin-3(2H)-ones as acyl transfer agents under transition-metal-free and eco-friendly conditions. It is worthy to note that the reaction is efficient, green, and economical, and will find several applications in organic synthesis, medicinal chemistry, and industrial chemistry. (C) 2013 Elsevier Ltd. All rights reserved.
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.
Efficient and green syntheses of heterocycles are of great importance. In this work, we have demonstrated the synthesis of benzo[d]thiazoles and benzo[d]oxazoles using 2-acylpyridazin-3(2H)-ones as acyl transfer agents under transition-metal-free and eco-friendly conditions. It is worthy to note that the reaction is efficient, green, and economical, and will find several applications in organic synthesis, medicinal chemistry, and industrial chemistry. (C) 2013 Elsevier Ltd. All rights reserved.
2-Acylpyridazin-3-ones: Novel Mild and Chemoselective Acylating Agents for Amines
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.