Organocatalytic Enantioselective Vinylogous Michael-Aldol Cascade for the Synthesis of Spirocyclic Compounds.
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DOI: 10.1021/acs.orglett.7b02085
Abstract: Enantioselective synthesis of pyrazolone-fused spirocyclohexenols by the secondary amine-catalyzed cascade reaction of α,β-unsaturated aldehydes with α-arylidene pyrazolinones is reported. This formal [3 + 3] organocascade reaction proceeds through a vinylogous Michael-aldol sequence to furnish the… read more here.
Keywords: aldol cascade; michael aldol; organocatalytic enantioselective; vinylogous michael ... See more keywords
Organocatalytic sulfa-Michael/aldol cascade: constructing functionalized 2,5-dihydrothiophenes bearing a quaternary carbon stereocenter
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DOI: 10.1039/c8ra04325f
Abstract: A practical sulfa-Michael/aldol cascade reaction of 1,4-dithiane-2,5-diol and α-aryl-β-nitroacrylates has been developed, which allows efficient access to functionalized 2,5-dihydrothiophenes bearing a quaternary carbon stereocenter in moderate to good yields with high enantioselectivities. read more here.
Keywords: aldol cascade; dihydrothiophenes bearing; sulfa michael; functionalized dihydrothiophenes ... See more keywords