Organocatalyzed multicomponent coupling using a new ester-containing, proline aryl sulfonamide has been developed for accessing densely functionalized cyclohexenones, each containing a quaternary center in high enantio- and diastereoselectivity. In contrast to most enamine/iminium-catalyzed reactions, the use of molecular sieves was critical to optimum enantioselectivity.
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Yang et al. (2010) studied this question.
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