Chiral Silver Phosphate Catalyzed Transformation of<i>ortho</i>-Alkynylaryl Ketones into 1<i>H</i>-Isochromene Derivatives through an Intramolecular-Cyclization/Enantioselective-Reduction Sequence
作者:Masahiro Terada、Feng Li、Yasunori Toda
DOI:10.1002/anie.201307371
日期:2014.1.3
The transformation of ortho‐alkynylaryl ketones through a cyclization/enantioselective‐reduction sequence in the presence of a chiral silver phosphate catalyst afforded 1H‐isochromene derivatives in high yield with fairly good to high enantioselectivity. An asymmetric synthesis of the 9‐oxabicyclo[3.3.1]nona‐2,6‐diene framework, which has been found in some biologically active molecules, is presented
Asymmetric Hydrogenation of In Situ Generated Isochromenylium Intermediates by Copper/Ruthenium Tandem Catalysis
作者:Tingting Miao、Zi-You Tian、Yan-Mei He、Fei Chen、Ya Chen、Zhi-Xiang Yu、Qing-Hua Fan
DOI:10.1002/anie.201611291
日期:2017.4.3
The first asymmetrichydrogenation of in situgeneratedisochromenylium derivatives is enabled by tandemcatalysis with a binary system consisting of Cu(OTf)2 and a chiral cationic ruthenium–diamine complex. A range of chiral 1H‐isochromenes were obtained in high yields with good to excellent enantioselectivity. These chiral 1H‐isochromenes could be easily transformed into isochromanes, which represent