A catalytic amount of a sterically and electronically tuned diarylsulfonamide promoted allylic and benzylic C–H arylations in cooperation with a visible light photoredox catalyst. This is the first example of the catalytic use of a sulfonamidyl radical to promote the hydrogen atom transfer process.
Direct C(sp<sup>3</sup>)–H Arylation of Unprotected Benzyl Anilines and Alkylarenes by Organocatalysis under Visible Light
作者:Cheng Huang、Peng Xiao、Zhong-Ming Ye、Chen-Lu Wang、Chen Kang、Sheng Tang、Zhenhong Wei、Hu Cai
DOI:10.1021/acs.orglett.3c03980
日期:2024.1.12
alkylarenes via consecutive photoinduced electron transfer by visiblelight irradiation. Reductive quenching cycles and radical–radical cross-coupling were involved, and electron paramagnetic resonance experiments provide evidence for the formation of radical intermediates formed in situ. The protocol highlights transition metalfree, external oxidantfree, broad substrate scope, and high efficiency (>60 examples
A General Strategy for Organocatalytic Activation of C–H Bonds via Photoredox Catalysis: Direct Arylation of Benzylic Ethers
作者:Katrine Qvortrup、Danica A. Rankic、David W. C. MacMillan
DOI:10.1021/ja411596q
日期:2014.1.15
Direct C-H functionalization and arylation of benzyl ethers has been accomplished via photoredox organocatalysis. The productive merger of a thiol catalyst and a commercially available iridium photoredox catalyst in the presence of household light directly affords benzylic arylation products in good to excellent yield. The utility of this methodology is further demonstrated in direct arylation of 2,5-dihydrofuran to form a single regioisomer.