Environmentally Sustainable and Chemo-selectively Favorable Synthesis of Substituted 2<i>H</i>-Pyran-2-ones in Water under MWI
作者:Liang-Yan Cui、Xin Wang、Yan He、Xue-Sen Fan
DOI:10.1002/jccs.201300013
日期:2014.2
this paper, a novel synthesis of diversely substituted 2H‐pyran‐2‐ones via the tandem reaction of 3‐hydroxyhexa‐4,5‐allenic esters in waterunder the promotion of MWI has been developed. Compared with those reactions carried out in organic solvents, water mediated synthesis of poly‐substituted 2H‐pyran‐2‐ones is not only environmentallysustainable, but also chemo‐selectively favorable.
An efficient palladium-catalyzed cross-coupling reaction of 4-hydroxy-pyrone or 4-hydroxy-2(5H)-furanone with arylboronic acid is described, which affords the 4-substituted-pyrones and 2(5H)-furanones in good yields. This transformation proceeds through a C-OH bond activation under mild conditions. (C) 2011 Elsevier Ltd. All rights reserved.