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Issue 8, 2019
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Efficient synthesis of chiral 2,3-dihydro-benzo[b]thiophene 1,1-dioxides via Rh-catalyzed hydrogenation

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Abstract

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 >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.

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

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Publication details

The article was received on 04 Dec 2018, accepted on 23 Dec 2018 and first published on 15 Jan 2019


Article type: Edge Article
DOI: 10.1039/C8SC05397A
Citation: Chem. Sci., 2019,10, 2507-2512
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    Efficient synthesis of chiral 2,3-dihydro-benzo[b]thiophene 1,1-dioxides via Rh-catalyzed hydrogenation

    G. Liu, H. Zhang, Y. Huang, Z. Han, G. Liu, Y. Liu, X. Dong and X. Zhang, Chem. Sci., 2019, 10, 2507
    DOI: 10.1039/C8SC05397A

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