Coverdale JPC, Sanchez-Cano C, Clarkson GJ, Soni R, Wills M, Sadler PJ. Easy To Synthesize, Robust Organo-osmium Asymmetric Transfer Hydrogenation Catalysts.
Chemistry 2015;
21:8043-6. [PMID:
25853228 PMCID:
PMC4832837 DOI:
10.1002/chem.201500534]
[Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 11/07/2022]
Abstract
Asymmetric transfer hydrogenation (ATH) is an important process in organic synthesis for which the Noyori-type Ru(II) catalysts [(arene)Ru(Tsdiamine)] are now well established and widely used. We now demonstrate for the first time the catalytic activity of the osmium analogues. X-ray crystal structures of the 16-electron Os(II) catalysts are almost identical to those of Ru(II). Intriguingly the precursor complex was isolated as a dichlorido complex with a monodentate amine ligand. The Os(II) catalysts are readily synthesised (within 1 h) and exhibit excellent enantioselectivity in ATH reactions of ketones.
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