An environmentally benign, transition-metal-free organic base promoted one-pot cascade synthesis of highly functionalized benzo[d]thiazol-2(3H)-ylidene benzamide in the presence of water was accomplished by three-component reaction of ortho-iodoanilines, acrylates, and aroyl isothiocyanates. The protocol involves the in situ generation of thiourea intermediate followed by triethylamine induced intramolecular
通过邻位
碘代
苯胺的三组分反应,完成了在
水存在下环境友好,无过渡
金属的有机碱促进一锅级联合成高官能度的苯并[ d ]
噻唑-2(3 H)-亚烷基苯甲酰胺。 ,
丙烯酸酯和芳基异
硫氰酸酯。该方案涉及原位生成
硫脲中间体,然后
三乙胺诱导的分子内SN Ar置换反应,随后将迈克尔加成到
丙烯酸酯上,导致形成苯并[ d ]
噻唑-2(3 H)-亚烷基苯甲酰胺。苯并[ b还可以使用酰胺化和分子内芳族亲核取代
化学方法以高收率生成
噻唑。控制实验支持所提出的机制途径。进一步的X射线晶体学研究证实了稠合的苯甲酰胺的指定结构。