Organocatalytic Conjugate Addition of Malononitrile to Conformationally Restricted Dienones
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Organocatalytic conjugate addition of malononitrile to conformationally restricted dienones has been studied. A series of chiral primary and tertiary amine catalysts were screened. A piperidine-based thiourea-tertiary amine was found to be the efficient catalyst. Chiral pyran derivatives were obtained in excellent yields and enantioselectivities via a cascade conjugate addition–intramolecular cyclization pathway. The reaction is remarkably different for the corresponding reaction of conformationally flexible dienones.
创建时间：
2011-05-20
