科研之友
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摘要
An aluminium chloride-mediated cascade reaction between pyrrolidones and trifluoroacetic anhydride is reported. Functionally diverse 1-chloro-2,2,2-trifluoroethylidene-substituted pyrrolidones were obtained in moderate to high yields through electrophilic trifluoroacetylation, nucleophilic chlorination, and elimination. This procedure has a wide scope, good functional-group tolerance and the reaction conditions are amenable to scale up. Additionally the obtained 1-chloro-2,2,2-trifluoroethylidene products can be applied to further functionalization as trifluoromethyl-containing building blocks. Some of the title compounds showed fungicidal activity against cucumber downy mildew (CDM).
