five-membered thiazole ring bonded to two hydrazone motifs is described. The acid-catalyzed reaction of one equivalent of thiocarbohydrazide, two equivalents of aromatic aldehydes, and one equivalent of phenacyl bromides afforded the five-membered thiazole ring. The reactions proceed with novel chemoselectivity. Similar reported protocols have always afforded 1,3,4-thiadiazines. GRAPHICAL ABSTRACT
                                    摘要描述了一种用于合成与两个腙基序结合的新型五元
噻唑环的一锅三组分方案。一当量的
硫代碳酰
肼、两当量的芳香醛和一当量的
苯甲酰溴在酸催化下反应得到五元
噻唑环。反应以新的
化学选择性进行。类似的报道协议一直提供 1,3,4-噻二嗪。图形概要