Construction of Diverse and Functionalized 2<i>H</i>-Chromenes by Organocatalytic Multicomponent Reactions
作者:Hongyun Cai、Likai Xia、Yong Rok Lee、Jae-Jin Shim、Sung Hong Kim
DOI:10.1002/ejoc.201500616
日期:2015.8
A green and efficient one-pot process for the construction of diverse and functionalized 2H-chromenes was developed by using multicomponent reactions of salicylaldehydes, alkynes (i.e., propiolate and acetylenedicarboxylates), and alcohols. This new protocol was achieved by using L-proline as a mild and green organocatalyst and offers several advantages such as economic availability, low toxicity,
通过使用水杨醛、炔烃(即丙炔酸酯和乙炔二羧酸酯)和醇的多组分反应,开发了一种绿色高效的一锅法,用于构建多样化和功能化的 2H-色烯。这一新方案是通过使用 L-脯氨酸作为温和的绿色有机催化剂实现的,并具有经济可用性、低毒性、易于处理、高区域选择性和温和反应条件下的环境友好性质等优点。作为该方法的延伸,通过用 2-氨基苯甲醛代替水杨醛合成了喹啉衍生物,并且通过该方法制备的 2-羟基-2H-色烯也通过氧化反应成功转化为具有生物学意义的香豆素。