期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 52, 页码 15818-15822出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507623
关键词
allenes; asymmetric catalysis; dynamic kinetic resolution; rhodium; sulfones
资金
- DFG
- International Research Training Group Catalysts and Catalytic Reactions for Organic Synthesis (IRTG) [1038]
- Fonds der Chemischen Industrie
- Krupp Foundation
A Z-selective rhodium-catalyzed hydrothiolation of 1,3-disubstituted allenes and subsequent oxidation towards the corresponding allylic sulfones is described. Using the bidentate 1,4-bis(diphenylphosphino) butane (dppb) ligand, Z/E-selectivities up to > 99: 1 were obtained. The highly atom-economic desymmetrization reaction tolerates functionalized aromatic and aliphatic thiols. Additionally, a variety of symmetric internal allenes, as well as unsymmetrically disubstituted substrates were well tolerated, thus resulting in high regioselectivities. Starting from chiral but racemic 1,3-disubstituted allenes a dynamic kinetic resolution (DKR) could be achieved by applying (S, S)-Me-DuPhos as the chiral ligand. The desired Z-allylic sulfones were obtained in high yields and enantioselectivities up to 96% ee.
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