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Synergistic Organocatalysis in the Kinetic Resolution of Secondary Thiols With Concomitant Desymmetrization of an Anhydride

Synergistic Organocatalysis in the Kinetic Resolution of Secondary Thiols With Concomitant Desymmetrization of an Anhydride

Aldo Peschiulli, Barbara Procuranti, Cornelius J O' Connor, Stephen J Connon

Nat Chem. 2010 May;2(5):380-4.

PMID: 20414238

Abstract:

Kinetic resolution is an important method for the separation of racemates into their component enantiomers. Thiols are precursors to a variety of organosulfur compounds, with high utility in both chemistry and chemical biology, yet there is a surprising dearth of methodologies for their direct and efficient catalytic kinetic resolution. Here, we demonstrate an organocatalytic process involving the highly enantioselective desymmetrization of an achiral electrophile with the simultaneous kinetic resolution of a racemic thiol. The preparative potential of the methodology is exemplified by the synthesis of a drug precursor antipode in excellent yield and enantioselectivity as a by-product of a process that also resolves a sec-thiol substrate with a selectivity of S = 226 (that is, both thiol antipodes produced in >95% ee at 51% conversion). In a second example a racemic sec-thiol representing the stereocentre-containing core of the anti-asthma drug (R)-Montelukast was resolved with synthetically useful selectivity under mild conditions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS31042392	Montelukast racemate			Price

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