Optically Active 3,4-Dihydrocoumarins via Organocatalyzed Asymmetric [4+2] Annulation of ortho-Hydroxyl Functionalized p-Quinone Methides with β-Keto Acylpyrazoles
Min Zhao, Fei Li, Yizheng Cheng, Youming Wang, Zhenghong Zhou
Chinese Journal of Organic Chemistry . 2021, (10): 4039 -4049 .  DOI: 10.6023/cjoc202105055