Phosphine-Catalyzed Chemoselective Reduction/Elimination/Wittig Sequence for Synthesis of Functionalized 3-Alkenyl Benzofurans
作者:Yan-Cheng Liou、Heng-Wei Wang、Athukuri Edukondalu、Wenwei Lin
DOI:10.1021/acs.orglett.1c00737
日期:2021.4.16
An efficient protocol for the construction of functionalized 3-alkenyl benzofurans is demonstrated under metal-free conditions using catalytic amount of phosphine proceeding an intramolecular Wittig reaction. This one-pot reaction initiated by the phospha-Michael addition of phosphine to O-acylated nitrostyrene, in which phosphine was in-situ-generated from the chemoselective reduction of phosphine
在无金属条件下,使用催化量的膦进行分子内维蒂希反应,证明了构建官能化的3-烯基苯并呋喃的有效方法。该一锅反应是通过将膦的膦-迈克尔加成到O-酰化的硝基苯乙烯而引发的,其中膦是通过用PhSiH 3对氧化膦进行化学选择性还原而原位生成的,从而产生了磷的内鎓盐,从而导致上述反应通过O-酰化/亚硝酸消除/ Wittig反应制备多官能化的苯并呋喃。