Catalytic Availabilities of Lewis Acidic SnCl<sub>2</sub>: Ph<sub>3</sub>PAuCl-SnCl<sub>2</sub>Composite Catalyzed Successive<i>ortho</i>-Alkenylation/O-Alkenylation of Phenols Followed by Cyclization to 1-Benzopyrans
作者:Atsushi Tochigi、Kadzuoki Tsukamoto、Noriyuki Suzuki、Yoshiro Masuyama
DOI:10.1002/ejoc.201601042
日期:2016.12
Ph3PAuCl and SnCl2, catalyzed the formation of 1-benzopyrans from phenols and phenylacetylene. The Ph3PAuCl–SnCl2 composite catalyzed reaction was presumed to proceed through the successive ortho-alkenylation and O-alkenylation of phenols with phenylacetylene followed by cyclization of the prepared ortho- and O-dialkenylated phenol derivatives. Conveniently, all reactions with Ph3PAuCl–SnCl2 composite
Ph3PAuCl-SnCl2 复合物,由 Ph3PAuCl 和 SnCl2 原位制备,催化苯酚和苯乙炔形成 1-苯并吡喃。据推测,Ph3PAuCl-SnCl2 复合催化反应通过苯乙炔对苯酚的连续邻烯基化和 O-烯基化,然后制备的邻-二烯基化苯酚衍生物的环化反应进行。方便的是,所有与 Ph3PAuCl-SnCl2 复合物的反应都在没有严格排除空气和水的情况下建立。