Tuning catalysts to tune the products: phosphine-catalyzed aza-Michael addition reaction of hydrazones with allenoates.

A new tunable phosphine-catalyzed aza-Michael β-addition reaction between allenoates and various hydrazones has been developed. These reactions are most-efficiently promoted by a catalytic amount of phosphine catalysts. These atom-economical reactions are operationally simple and their corresponding adducts can been achieved in high yields and high selectivity under mild reaction conditions. Further studies revealed that different phosphine catalyst can produce different adducts from the same starting materials.

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