Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 29, Pages 9886-9890Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900442
Keywords
allylic substitution; a-amino nitriles; asymmetric catalysis; homoenolates; rhodium-catalyzed reactions
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Funding
- National Sciences and Engineering Research Council (NSERC)
- Queen Q s University
- NSERC
- Government of Ontario
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An enantioselective rhodium-catalyzed allylic alkylation of b, g-unsaturated a-amino nitriles is described. This protocol provides a novel approach for the construction of bstereogenic carbonyl derivatives via the catalytic asymmetric alkylation of a homoenolate equivalent. The particularly challenging nature of this transformation is highlighted by the fact that three modes of selectivity must be manipulated, namely regio-and enantioselectivity, in addition to geometrical control. The g-stereogenic cyanoenamine products can be readily hydrolyzed in situ to afford the b-substituted carboxylic acids, which in turn provide expedient access to a number of related carbonyl derivatives. Additionally, control experiments indicate that the chiral rhodium-allyl intermediate facilitates the selective formation of the E-cyanoenamine products, which is critical since the Z-isomer affords significantly lower enantiocontrol.
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