Iron‐Catalyzed Synthesis of Substituted Thiazoles from Enamines and Elemental Sulfur through C−S Bond Formation
作者:Mingzhong Wu、Yong Jiang、Zhenyu An、Zhenjie Qi、Rulong Yan
DOI:10.1002/adsc.201800693
日期:2018.11.5
An atom economical approach for the synthesis of substituted thiazoles starting from enamines and elementalsulfur through the C−H functionalization/C−S bond formation is described. Under the optimized conditions, various substituted enamines reacted smoothly with elementalsulfur and the desired substituted thiazoles were generated in moderate to excellent yields.
An efficient, one-pot, regioselective synthesis of 2-aryl/hetaryl-4-methyl-5-acylthiazoles under solvent-free conditions
作者:Ranjana Aggarwal、Mona Hooda、Naman Jain、Dionisia Sanz、Rosa M. Claramunt、Brendan Twamley、Isabel Rozas
DOI:10.1080/17415993.2021.1975119
日期:2022.1.2
In this article, we present an efficient, one-pot regioselective approach towards the synthesis of 2-aryl/hetaryl-4-methyl-5-acylthiazoles obtained during the reaction of α-bromo-1,3-diketones generated in situ by triturating unsymmetrical 1,3-diketones with N-bromosuccinimide, with various thioamides undersolvent-freeconditions. This environmentally benign protocol showed large functional group
在本文中,我们提出了一种有效的一锅区域选择性方法来合成 2-芳基/杂芳基-4-甲基-5-酰基噻唑,该方法是通过研磨原位生成的 α-溴-1,3-二酮反应过程中获得的不对称的 1,3-二酮与N-溴代琥珀酰亚胺,在无溶剂条件下与各种硫代酰胺。这种对环境无害的方案显示出较大的官能团耐受性,导致在两种可能的区域异构体中以令人钦佩的产率独家形成单一异构体。基于多核 NMR [( 1 H- 13 C) HMBC, ( 1 H- 13 C) HMQC, ( 1 H-15 N) HMBC] 和 X 射线晶体学研究。整个协议在生态上是可取的,因为它不使用有机溶剂。
Electrochemical Enaminone-Thioamide Annulation and Thioamide Dimeric Annulation for the Tunable Synthesis of Thiazoles and 1,2,4-Thiadiazole
作者:Qihui Huang、Jianchao Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.4c01532
日期:2024.6.28
A green and sustainable electrochemical oxidative cyclization of enaminones with thioamides under metal- and oxidant-free conditions has been developed, providing an efficient approach for thiazole synthesis. Furthermore, 1,2,4-thiadiazoles can be selectively accessed via the electrochemical dimerization of thioamides in the absence of enaminones.