A reaction of 1,2-diamines and aldehydes with silyl cyanide as cyanide pronucleophile to access 2-aminopyrazines and 2-aminoquinoxalines
作者:Sankar K. Guchhait、Garima Priyadarshani、Nikhil M. Gulghane
DOI:10.1039/c6ra12028h
日期:——
A new condensation reaction of ethylene-1,2-diamines or o-phenylenediamines and aromatic aldehydes with TMSCN as a cyanide-pronucleophile is documented. The reaction proceeds through a tandem sequence of desilylation, Strecker reaction, amidine-forming cyclization and dehydrogenative aromatization, and provides a straightforward synthetic route to access synthetically and biologically important motifs
记录了乙烯-1,2-二胺或邻苯二胺与芳族醛与TMSCN作为氰化物-亲核试剂的新缩合反应。该反应通过去甲硅烷基化,斯特雷克反应,形成idine的环化反应和脱氢芳构化反应的串联序列进行,并提供了直接的合成路线,可接近合成和生物学上重要的基序,3-芳基取代的2-氨基吡嗪和2-氨基喹喔啉。DBU具有独特的功能和加速作用,使得实现涉及多个C–C / N / Si键形成/断裂事件的反应成为可能。有趣的是,该协议已启用所需的串联路径,而仅从常规转换中进行切换。