Journal
ORGANIC LETTERS
Volume 15, Issue 10, Pages 2346-2349Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol400529k
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The Rh(I)center dot 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.
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