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Rh-catalyzed asymmetric hydrogenation of prochiral substituted benzo[ b ]thiophene 1,1-dioxides was successfully developed, affording various chiral 2,3-dihydrobenzo[ b ]thiophene 1,1-dioxides with high yields and excellent enantioselectivities (up to 99% yield and &gt;99% ee). In particular, for challenging substrates, such as aryl substituted substrates with sterically hindered groups and alkyl substituted substrates, the reaction proceeded smoothly in our catalytic system with excellent results. The gram-scale asymmetric hydrogenation proceeded well with 99% yield and 99% ee in the presence of 0.02 mol% (S/C = 5000) catalyst loading. The possible hydrogen-bonding interaction between the substrate and the ligand may play an important role in achieving high reactivity and excellent enantioselectivity.

Efficient synthesis of chiral 2,3-dihydro-benzo[b]thiophene 1,1-dioxides via Rh-catalyzed hydrogenation