Synthesis of Cyclic Azomethine Imines by Cycloaddition Reactions of <i>N</i>-Isocyanates and <i>N</i>-Isothiocyanates
作者:Amanda Bongers、Indee Ranasinghe、Philippe Lemire、Alyssa Perozzo、Jean-François Vincent-Rocan、André M. Beauchemin
DOI:10.1021/acs.orglett.6b01788
日期:2016.8.5
2]-cycloaddition reactions to form azomethine imines containing triazolone, triazole–thione, and pyrazole–thione cores. First, iminoisothiocyanates are shown to undergo aminothiocarbonylation reactions with strained alkenes, and a comparison with recently reported reactions of iminoisocyanates highlights their reduced reactivity. In contrast, amino(thio)carbonylation reactions of imines with iminoisocyanates
各种氮取代的异(硫)氰酸酯参与[3 + 2]-环加成反应,形成包含三唑酮,三唑-硫酮和吡唑-硫酮核的甲亚胺亚胺。首先,显示亚氨基异硫氰酸酯与张力烯烃发生氨基硫代羰基化反应,并且与最近报道的亚氨基异氰酸酯反应进行比较表明其反应性降低。相比之下,亚胺与亚氨基异氰酸酯和亚氨基异硫氰酸酯的氨基(硫)羰基化反应被证明更有效,提供了进入三唑酮和三唑硫酮核的途径。偶极子产物可以通过简单的衍生化反应转化为有价值的杂环核。