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[摘要]：A new catalytic Ugi-type condensation of alpha-isocyanoacetamide and chiral cyclic imine is developed, where the combination of phenyl phosphilic acid and trifluoroethanol is exploited to promote the Ugi-type condensation with alpha-isocyanoacetamide for the first time. Under this new catalytic system, the reaction using the cyclic imines as relatively inertial substrates proceed well, and chiral 3-oxazolyl-morpholin/piperazine-2-one derivatives are synthesized with high yield and stereoselectivity. Furthermore, transformation of the condensation product to a novel fused tricyclic structure is attempted initially by treatment with maleic anhydride. |
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