Secondary-sphere modification in proline catalysis: old friend, new connection
作者:Ido Domb、Danilo M. Lustosa、Anat Milo
DOI:10.1039/d1cc05589e
日期:——
reactivity and selectivity of amino catalysts. Herein, the carboxylic acid moiety of proline was targeted as a site for modification under catalytic reaction conditions with boronic acids. Intermolecular aldolreactions between aromatic aldehydes and cyclopentanone were selected as a proof-of-concept because cyclopentanone as an aldol donor was often associated with decreased selectivity compared to its
The intermolecular reductive coupling reaction of cyclopent-2-enone and aromatic aldehydes was realized by chiral rhodium-(bisoxazolinyl)phenyl catalysts, Rh(Phebox-Ph)(OAc)(2)(H2O), with diphenymethylsilane as a hydride donor to give the corresponding beta-hydroxyketones in high anti selectivity (up to 96%) with high enantioselectivity (up to 93%).