Effect of Substituents on the Regioselectivity of the Reaction of α-Tosyloxyketones with Thioureas in Acidic Medium: Access to 2-Aminothiazoles and 2-Imino-2,3-dihydrothiazoles
作者:Ranjana Aggarwal、Rajiv Kumar、Dionisia Sanz、Rosa M. Claramunt
DOI:10.1002/jhet.1676
日期:2014.5
Regioselective condensation of α‐tosyloxyacetophenones 1 and N‐substituted thioureas 2 in acidic medium to give regioisomers 2‐aminothiazoles I and 2‐imino‐2,3‐dihydrothiazoles II is largely influenced by the substituents present on 1 and 2. A mechanism, supported by DFT calculations has been proposed to explain the observed regioselectively.
α-甲苯磺酰氧基苯乙酮1和N-取代的硫脲2在酸性介质中的区域选择性缩合反应产生区域异构体2-氨基噻唑I和2-亚氨基-2,3-二氢噻唑II在很大程度上受到1和2上存在的取代基的影响。已经提出了一种由DFT计算支持的机制来选择性地解释所观察到的区域。