doi: 10.1021/ol8007183.
Epub 2008 May 20.
Organocatalytic asymmetric tandem Michael-Henry reactions: a highly stereoselective synthesis of multifunctionalized cyclohexanes with two quaternary stereocenters
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- PMID: 18489178
- DOI: 10.1021/ol8007183
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Organocatalytic asymmetric tandem Michael-Henry reactions: a highly stereoselective synthesis of multifunctionalized cyclohexanes with two quaternary stereocenters
Org Lett.
.
Abstract
A novel organocatalytic asymmetric tandem Michael-Henry reaction catalyzed by 9-amino-9-deoxyepiquinine (VI) has been developed. The reaction was efficiently catalyzed by catalyst VI to give highly functionalized cyclohexanes with four stereogenic carbons including two quaternary stereocenters in excellent enantioselectivities (97 to >99% ee) and high diastereoselectivities (93:7-99:1 dr). Thus, the first organocatalytic asymmetric Henry reaction of common ketones as acceptors is shown.
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