A Borane-Catalyzed Metal-Free Hydrosilylation of Chromones and FlavonesWe are grateful for the generous financial support by the National Natural Science Foundation of China (21222207, 21572231, 21521002).
Received: 28 April 2017
Accepted after revision: 29 May 2017
06 July 2017 (eFirst)
Published as part of the Cluster Silicon in Synthesis and Catalysis
A Piers-type hydrosilylation of chromones and flavones has been successfully realized for the first time using 0.1 mol % of borane catalyst generated in situ by hydroboration of pentafluorostyrene with HB(C6F5)2 to afford a variety of chromanones and flavanones in 60–99% yields. An attempt for the asymmetric transformation with chiral diyne and HB(C6F5)2 gave chromanones and flavanones in high yields with up to 32% ee.