Visible Light-Induced Regioselective/Dehydrogenative Silylation of (Thio)chromones via Tricatalytic Process

Abstract

Direct C-H silylation of (thio)chromones was achieved by the combination of hydrogen atom transfer (HAT), photoredox and transition metal catalysis under ambient air conditions. High regioselectivity, oxidant-and noble metal-free conditions, and synergistic multiple catalysis were the major features of this protocol. Moreover, this approach can be safely conducted on a gram scale with hydrogen as the only byproduct.6