Exploration and Optimization of an Efficient One-pot Sequential Synthesis of Di/tri-substituted Thiazoles from α-Bromoketones, Thioacids Salt, and Ammonium Acetate
作者:Eeda Venkateswararao、Hitesh B. Jalani、Manickam Manoj、Sang-Hun Jung
DOI:10.1002/jhet.2446
日期:2016.9
Exploration of scope of an optimized one‐pot sequential procedure for preparing of 2,4‐di‐ and 2,4,5‐tri‐substituted thiazoles has been accomplished. The synthesis was performed by the initial formation of a β‐keto‐thioester intermediate from nucleophilic substitution of α‐bromoketones with thioacid potassium salts, followed by treatment with ammonium acetate and one equivalent of acetic acid in toluene
探索了用于制备2,4-二-和2,4,5-三-取代的噻唑的优化单锅顺序程序的范围。通过用硫代酸钾盐亲核取代α-溴酮,首先形成β-酮-硫酯中间体,然后用乙酸铵和一当量的乙酸在甲苯中处理,形成亚胺中间体,从而最终导致环化反应产生噻唑。该过程应以灵活的方式加以强调,以通过选择适当取代的α-溴酮(甚至包含酸不稳定的官能团和硫代酸钾盐)来控制噻唑环周围的取代方式,因此其适用性非常广泛。