Friedlander synthesis of novel benzopyranopyridines in the presence of chitosan as heterogeneous, efficient and biodegradable catalyst under solvent-free conditions
作者:Zeba N. Siddiqui、Kulsum Khan
DOI:10.1039/c3nj00069a
日期:——
Efficient synthesis of benzopyrano[4,3-b]pyridine derivatives was achieved from 4-amino-3-formylcoumarin and different active methylene compounds under solvent-free thermal heating at 80 °C via Friedlander condensation in the presence of chitosan as heterogeneous, basic green catalyst. The present methodology is a novel green approach to benzopyranopyridine. It offers several advantages such as shorter
高效合成苯并吡喃并[4,3- b ]吡啶衍生物4-氨基-3-甲酰基香豆素在不存在溶剂的情况下,在80°C下通过Friedlander缩合在无溶剂的条件下进行加热加热,得到不同的活性亚甲基化合物壳聚糖作为非均质碱性绿色催化剂。本方法学是一种新颖的绿色方法苯并吡喃吡啶。它具有许多优点,例如反应时间短,反应条件温和,操作程序简单,使用可回收和可生物降解的催化剂。