DMAP-catalyzed [4+2] annulation of α-substituded allenoates with unsaturated pyrazolones

Add time:07/15/2019    Source:sciencedirect.com

A DMAP-catalyzed [4 + 2] annulation of α-substituted allenoates with unsaturated pyrazolones has been achieved in dichloromethane at 40 °C, providing multisubstituted tetrahydropyrano [2,3-c]pyrazoles in good to excellent yields with moderate to good Z/E ratios. The allenoates worked as two-carbon synthons in the reaction.

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