An Expedient Radical Approach for the Decarboxylative Synthesis of Stereodefined All‐Carbon Tetrasubstituted Olefins
Qian Zeng, Yamini Nirwan, Jordi Benet‐Buchholz, Arjan W. Kleij
Abstract
Abstract We report a user‐friendly approach for the decarboxylative formation of stereodefined and complex tri‐ and tetra‐substituted olefins from vinyl cyclic carbonates and amines as radical precursors. The protocol relies on easy photo‐initiated α‐amino‐radical formation followed by addition onto the double bond of the substrate resulting in a sequence involving carbonate ring‐opening, double bond relay, CO 2 extrusion and finally O ‐protonation. The developed protocol is efficient for both mismatched and matched polarity substrate combinations, and the scope of elaborate stereodefined olefins that can be forged including drug‐functionalized derivatives is wide, diverse and further extendable to other types of heterocyclic and radical precursors. Mechanistic control reactions show that the decarboxylation step is a key driving force towards product formation, with the initial radical addition under steric control.