Solvent Anions Enable Photoinduced Borylation and Phosphonation of Aryl Halides via EDA Complexes

Org Lett. 2022 Sep 9;24(35):6466-6471. doi: 10.1021/acs.orglett.2c02631. Epub 2022 Aug 25.

Abstract

We report the synthesis of aryl boronic esters and aryl phosphonate esters promoted by visible-light in the absence of transition-metals or photoredox catalysts. The transformation proceeds at room temperature using sodium hydride, as a non-nucleophilic base, and exhibits functional group tolerance for anilines, amides, and esters. UV-vis spectroscopy, radical trapping experiments, and computational (TD-DFT) calculations suggest an electron-donor-acceptor (EDA) complex between solvent anions and aryl halides as the species responsible for this reactivity.