One pot synthesis of new benzopyranopyridines via Friedlander condensation
作者:Zeba N. Siddiqui
DOI:10.1016/j.tetlet.2012.07.013
日期:2012.9
synthetic route to new benzopyrano [2,3-b] pyridines in excellent yield via Friedlander condensation has been developed by the reaction of 2-amino-3-formylchromone 1a–b and cyclic active methylene compounds 2a–e in the presence of Zn(l-proline)2 as an efficient, stable, and inexpensive Lewisacidcatalyst in water. The present methodology offers several advantages such as shorter reaction time, mild reaction
通过2-氨基-3-甲酰基色酮1a - b与环状活性亚甲基化合物2a - e在苯胺中的反应,开发了一种通过弗里德兰德缩合反应以高收率获得新的苯并吡喃并[2,3- b ]吡啶的简便,绿色的合成途径。 Zn(1-脯氨酸)2作为有效,稳定和廉价的路易斯酸催化剂在水中的存在。本方法提供了许多优点,例如较短的反应时间,温和的反应条件,简单的操作程序,可循环使用的催化剂以及对环境安全。