我们报告了使用DMSO / H 2 O 2作为氧化剂在水中构建苯并咪唑并[2,1-b]噻唑骨架的绿色和区域选择性过程。实验数据为通过在DMSO / H 2 O 2的氧化下将酮的亚甲基氧化为碳自由基而引发转化的机理提供了支持。这种操作简单且无金属的方法可以促进苯并咪唑并[2,1-b]噻唑衍生物的多样化收集。
A convenient one-pot synthesis of 2-benzimidazolyl-thioacetophenones and thiazolo[3,2-a]benzimidazoles
作者:Abd El-Wareth A.O. Sarhan、Hasan A.H. El-Sherief、Abdalla M. Mahmoud
DOI:10.1016/0040-4020(96)00569-8
日期:1996.7
etophenones 3a-d. Which on cyclization yield thiazolo[3,2-a]-benzimidazoles 4a-d. Acetylation of 3a,d gave the N-acetyl derivatives 5a,d. Cyclization of 3a-d or 5d in acetic anhydride or acetic anhydride / pyridine mixture afforded 6a-d. While reaction of 1 with aliphatic or alicyclic ketones gave directly 2,3-disubstituted thiazolo[3,2-a]benzimidazoles 7a-f and 8a-d respectively.
DMSO/H
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O
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Promoted Regioselective Synthesis of Benzoimidazo[2,1‐b]thiazoles from 2‐Mercaptobenzimidazoles and Ketones in Water
We report a green and regioselective process for the construction of benzoimidazo[2,1‐b]thiazole skeletons in water using DMSO/H2O2 as an oxidant. The experimental data lend support to a mechanism in which the transformation is initiated by oxidizing methylene of ketone into carbon radical under the oxidation of DMSO/H2O2. This operationally simple and metal‐free procedure could facilitate a diverse
我们报告了使用DMSO / H 2 O 2作为氧化剂在水中构建苯并咪唑并[2,1-b]噻唑骨架的绿色和区域选择性过程。实验数据为通过在DMSO / H 2 O 2的氧化下将酮的亚甲基氧化为碳自由基而引发转化的机理提供了支持。这种操作简单且无金属的方法可以促进苯并咪唑并[2,1-b]噻唑衍生物的多样化收集。