Reported is the controllable selectivity syntheses of four distinct products from the same starting materials by visible‐light photoredox catalysis. By employing a dicyanopyrazine‐derived chromophore (DPZ) as photoredox catalyst, an aerobic radical mechanism has been developed, and allows the reactions of N‐tetrahydroisoquinolines (THIQs) with N‐itaconimides to through four different pathways, including addition‐cyclization
Enantioselective Conjugate Addition‐Protonation of 5
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‐Oxazol‐4‐ones and 5‐Methylene 1,3‐Oxazolidine‐2,4‐diones: 2,2'‐Biphenol‐Induced Diastereoselectivity Switch
作者:Bohua Lu、Shuang Xin、Bo Zhu、Junbiao Chang
DOI:10.1002/cjoc.201900111
日期:2019.7
asymmetric conjugateaddition‐protonation and diastereoselective switch between 5H‐oxazol‐4‐ones and 5‐methylene 1,3‐oxazolidine‐2,4‐diones was established. An array of chiral conjugateaddition‐protonation products bearing 1,3‐O‐heterotertiary‐O‐heteroquarternary nonadjacent stereocenters were obtained in excellent yields, moderate to good diastereoselectivities, and excellent enantioselectivities (up to