Study on the iodine-catalyzed reaction of 3-aminopyrazine-2-carbohydrazide and 2-(arylethynyl)benzaldehydes
作者:Wan-Chen Pan、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1016/j.tet.2018.02.007
日期:2018.3
At 60 °C in DMSO, the iodine-catalyzed reaction of 3-aminopyrazine-2-carbohydrazide and 2-(arylethynyl)benzaldehydes led hydrazones. Increasing the reaction temperature to 100 °C, the amino and amido still indicated inactive, only the imine took part in the addition of acetylene bond to give 2-arylisoquinolines in high yields with the cleavage of N-N bond unexpectedly under metal-free conditions.
在60°C的
DMSO中,
碘催化的3-
氨基吡嗪-2-碳酰
肼与2-(芳基
乙炔基)
苯甲醛的反应导致led。将反应温度提高至100°C,
氨基和酰胺基仍然不活泼,只有
亚胺参与
乙炔键的添加,以高收率得到2-芳基
异喹啉,在无
金属条件下NN键意外地断裂。