Diazaphospholene‐Catalyzed 1,6‐Conjugate Reduction of Para‐Quinone Methides

In the past 10 years, P ‐hydrido‐1,3,2‐diazaphospholenes (DAP‐Hs) have been demonstrated to be able to reduce carbonyls, imines, and enones. However, the 1,6‐conjugate reduction transformations catalyzed by DAP‐Hs have been rarely studied. Herein, we developed a DAP‐catalyzed 1,6‐conjugate reduction of p ‐QMs with DAP‐Br as the precatalyst. Furthermore, the dienone could also be well tolerated in this transformation.