Abstract
AbstractTrialkylaluminium reagents have been found to undergo a copper‐catalyzed asymmetric conjugate addition (ACA) reaction with oxabicyclo[2.2.1]hepta‐2,5‐diene‐2,3‐dicarboxylates with the simultaneous creation of two stereocenters. Different types of ligands were tested, and chiral phosphoramidite ligands allowed the reaction to proceed with good yields and good to excellent enantioselectivity. The syn substitution product observed by X‐ray analysis suggests an exo attack of the nucleophile. Herein we report the results obtained in the development of this copper‐catalyzed ACA methodology, which affords an all‐carbon quaternary center with unsubstituted and substituted oxacyclic Michael acceptors. The study was completed by mechanistic investigations performed to elucidate the original reaction pathway. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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