Abstract
The Rh(I)•CKphos catalyzed [2 + 2 + 2] cycloaddition of 1,1-disubstituted alkenyl isocyanates and alkyl alkynes selectively forms previously inaccessible vinylogous amide indolizidinone cycloadducts, establishing an aza-quaternery stereocenter with excellent enantioselectivities (up to 98% ee). This advance enables a seven step catalytic, asymmetric synthesis of the tricyclic core of the cylindricine alkaloids with excellent control of product selectivity as well as regio- and enantioselectivity.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Alkaloids / chemical synthesis*
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Alkaloids / chemistry
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Catalysis
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Cycloaddition Reaction
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Heterocyclic Compounds, 3-Ring / chemical synthesis*
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Heterocyclic Compounds, 3-Ring / chemistry
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Indolizines / chemical synthesis*
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Indolizines / chemistry
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Molecular Structure
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Quinolones / chemical synthesis*
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Quinolones / chemistry
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Rhodium / chemistry*
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Stereoisomerism
Substances
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Alkaloids
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Heterocyclic Compounds, 3-Ring
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Indolizines
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Quinolones
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cylindricine C
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Rhodium