On Water: Metal-Free Synthesis of Highly Functionalized Benzothiazolylidene from <i>ortho</i>-Haloanilines
作者:Kapil Mohan Saini、Rakesh K. Saunthwal、Shiv Kumar、Akhilesh K. Verma
DOI:10.1021/acs.joc.8b03107
日期:2019.3.1
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。