The [3 + 2] cycloaddition reaction of thiazole carbene-derived C-C-Se 1,3-dipoles: a concise and highly efficient strategy for the construction of multifunctional dihydroselenophenes and selenopheno[2,3-b]pyrazines
作者:Jian-Hong Zhang、Ying Cheng
DOI:10.1039/b904575a
日期:——
olium inner salts, the unique thiazole carbene-derived C+-C-Se− 1,3-dipoles, reacted efficiently with methoxycarbonylallenes or dimethyl acetylenedicarboxylate to produce dihydroselenophenes or selenopheno[2,3-b]pyrazines, respectively, in high yields. Both reactions probably proceeded via a [3 + 2] cycloaddition of C+-C-Se− 1,3-dipoles with alkenes or alkyne followed by different transformations of
报道了关于C + -C-Se - 1,3-偶极与缺电子烯烃和炔烃反应的第一项研究。2-芳基硒代氨基甲酰基噻唑鎓内盐(独特的噻唑卡宾衍生的C + -C-Se - 1,3-偶极子)可与甲氧基羰基烯丙基有效地反应,或乙炔二羧酸二甲酯分别以高收率生产二氢硒代苯醚或硒代苯并[2,3- b ]吡嗪。这两个反应都可能是通过C + -C-Se - 1,3-偶极与烯烃或炔烃的[3 + 2]环加成反应进行的,然后噻唑-螺-硒烯中间体进行了不同的转化。这项工作为多功能二氢硒代苯酚和硒代苯并[2,3- b ]吡嗪的构建提供了简洁有效的策略,而其他方法不易获得。