Indium(<scp>iii</scp>)-catalyzed solvent-free multicomponent [2 + 2 + 1 + 1]-annulation to polycyclic functionalized fused pyridines as potential optical chemosensors
作者:Sana Jamshaid、Sonaimuthu Mohandoss、Yong Rok Lee
DOI:10.1039/d1gc01332g
日期:——
one-pot [2 + 2 + 1 + 1]-annulation for the construction of highly fused polycyclic functionalized pyridines as a novel green approach is described. This unique reaction yields a wide range of polycyclic products bearing dihydrobenzoquinoline, azafluorene, azafluorenone, pyridocoumarin, and benzocycloheptapyridine frameworks. The synthesized compounds exhibit excellent photophysical properties as new fluorophores
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 undersolvent-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。