Unexpected sulfonylamino migration in the reactions of carbazole derivatives with fluoroalkanesulfonyl azides
作者:Ping He、Shizheng Zhu
DOI:10.1016/j.tet.2005.08.100
日期:2005.12
The reactions of fluoroalkanesulfonyl azides 1 with carbazole derivatives have been studied in detail. At room temperature 1 reacted with 1,2,3,4-tetrahydrocarbazole 2 readily to afford ring-contraction spiroindole derivatives 3 together with an unexpected 4a-fluoroalkanesulfonylamino-1,2,3,4-tetra-hydrocarbazoles 4. However, in the case of 9-methyl-1,2,3,4-tetrahydrocarbazole 5, unexpected sulfonylamino
已经详细研究了氟代烷烃磺酰叠氮化物1与咔唑衍生物的反应。在室温1下,容易与1,2,3,4-四氢咔唑2反应,得到环收缩的螺吲哚衍生物3以及意外的4a-氟烷磺酰基氨基-1,2,3,4-四氢咔唑4。然而,在9-甲基-1,2,3,4-四氢咔唑的情况下5,意想不到磺酰迁移发生和类似的产品9-甲基-1- fluoroalkanesulfonylamino -2,3,4,9-四氢-1- ħ -咔唑6以中等产量获得主要产品。这些新产品通过光谱方法和单X射线衍射分析得到了充分的表征。提出了这些反应的可能机制。