Thermal oligomerisation of aryl isocyanides: formation of pyrazino[1,2-a:4,5-a′]diindoles and indigo diarylimines
作者:Jan C. A. Boeyens、Leanne M. Cook、Yunxiang Ding、Manuel A. Fernandes、David H. Reid
DOI:10.1039/b302340k
日期:——
The aryl isocyanides 1â4 are converted at 150 °C into the hexameric pyrazino[1,2-a:4,5-aâ²]diindoles 15â19. 4-Fluorophenyl isocyanide, when heated at 135 °C, gave the hexamer 19 and the tetrameric indigo di-arylimine 9, and when kept at ambient temperature gave mainly the tetramer 9 in low yield. The structures of the hexamer 19 and the tetramer 9 were established by X-ray crystallography. Mechanisms are proposed for the oligomerisation reactions.
将苯基异氰化合物1~4在150℃下转化为六聚吡嗪[1,2-a:4,5-a']二吲哚15~19。4-氟苯基异氰在135℃加热时得到六聚体19和四聚吲哚二芳基亚胺9,而在室温下主要得到低产率的四聚体9。通过X射线晶体学确定了六聚体19和四聚体9的结构。提出了这些寡聚反应的机理。