Chiral Brønsted acid-catalyzed asymmetric intermolecular [4 + 2] annulation of ynamides with para-quinone methides

Catalytic asymmetric transformations of ynamides have attracted considerable attention in recent years. However, most of them were limited to intramolecular reactions or required metal catalysts. Herein, a chiral Brønsted acid-catalyzed asymmetric intermolecular [4 + 2] annulation of ynamides with p...

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