Abstract
AbstractIn this work, the phosphine‐catalyzed annulation reactions between modified allylic derivatives and polar 1,1‐dicyano‐1,3‐dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4+1] annulation reaction is realized between a series of 1,1‐dicyano‐2,4‐diaryl‐1,3‐dienes and ethoxycarbonyl‐activated allylic acetate, producing polysubstituted cyclopentenes in modest to excellent yields. It is also observed that the substituents of both 1,3‐dienes and allylic derivatives have a significant influence on the annulation mode: under the catalysis of PPh3 or PBu3 (20 mol%), regioselective [3+2] annulation products are formed from differently substituted substrates.
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