Photocatalytic Additions of 1‐Sulfoximidoyl‐1,2‐Benziodoxoles to Styrenes

Sulfoximidoyl‐containing 1,2‐benziodoxoles add to styrenes by a photoredox radical process affording difunctionalized products with high regioselectivity. The solvent plays a significantly role in the reaction path, in which Eosin Y appears to have a dual role rendering the process diastereoselective. With Eosin Y as the photocatalyst, sulfoximidoyl‐substituted 1,2‐benziodoxoles add to double bonds of styrene derivatives. The process is highly regioselective providing difunctionalized products with remarkable diastereoselectivities. The H‐bond capabilities of the organic photocatayst appear to play an important role in the selectivity‐determining step of the process.