Reaction of benzoxazole-2-thione with 3,5-di-tert-butyl-4-hydroxybenzylacetate in methanol affords S-(3,5-di-tert-butyl-4-hydroxybenzyl)-2-mercaptobenzoxazole as the major product. Antiradical activity of S- and N-3,5-di-tert-butyl-4-hydroxybenzyl derivatives of benzothiazole(oxazole, imidazole)-2-thione with respect to 2,2-diphenyl-1-picrylhydrazyl is varies widely. S-Benzyl derivatives exhibit higher reactivity at 30A degrees C.
Visible-Light-Promoted [3 + 2] Cyclization of Chalcones with 2-Mercaptobenzimidazoles: A Protocol for the Synthesis of Imidazo[2,1-<i>b</i>]thiazoles
作者:Ziren Chen、Fei Xue、Yonghong Zhang、Weiwei Jin、Bin Wang、Yu Xia、Mengwei Xie、Ablimit Abdukader、Chenjiang Liu
DOI:10.1021/acs.orglett.2c00867
日期:2022.5.6
diverse imidazo[2,1-b]thiazoles via an electron–donor–acceptor (EDA) complex has been developed. This novel aminothiolation can be realized under only visible light irradiation without the aid of external photocatalysts, transition metals, and oxidants. Mechanistic investigations have revealed that the thiol anions and chalcones form EDA complexes, providing a novel strategy for the synthesis of imidazo[2
已经开发了一种可见光促进的查耳酮和 2-巯基苯并咪唑之间的 [3 + 2] 环化,用于通过电子 - 供体 - 受体 (EDA) 复合物构建不同的咪唑并[2,1- b ] 噻唑。这种新型氨基硫醇化可以在仅可见光照射下实现,无需外部光催化剂、过渡金属和氧化剂的帮助。机理研究表明,硫醇阴离子和查耳酮形成EDA配合物,为咪唑并[2,1- b ]噻唑的合成提供了一种新的策略。