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。