4-Acylsubstituted fulvene, cycloaddition

Cycloaddition of 4-acylsubstituted fulvene 425 with the imine 427 in boiling toluene gave the tricyclic pyrroline 428. Treatment of 426 with 427 and subsequent reaction of the product 429 with malononitrile gave 428 (86S908) (Scheme 72). 

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