Jhang YJ, Zhelavskyi O, Nagorny P. Enantioselective Parallel Kinetic Resolution of Aziridine-Containing Quinoxalines via Chiral Phosphoric Acid-Catalyzed Transfer Hydrogenation.
Org Lett 2023;
25:7721-7726. [PMID:
37853540 DOI:
10.1021/acs.orglett.3c03072]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
This article describes the asymmetric synthesis of chiral aziridinoquinoxalines using (R)-TRIP-catalyzed parallel kinetic resolution under transfer hydrogenation conditions. This resolution was successfully accomplished for 16 different substrates and led to highly enantioenriched diastereomers with the (R)-configuration of the newly formed stereocenter (32-61% yield and 64-99% ee for the (R,R,R)-diastereomers and 7-46% yield and 97-99% ee for the (S,S,R)-diastereomers). This process could be coupled to ring-opening of the (S,S,R)-diastereomer with thiophenol to produce chiral tetrahydroquinoxalines with three contiguous stereocenters.
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