asymmetric α‐hydroxylation of β‐indanone esters and β‐indanone amides using peroxide as the oxidant was realized with a new C‐2′ substituted Cinchona alkaloid derivatives. The two enantiomers of α‐hydroxy‐β‐indanone esters could be obtained by simply changing the oxidant. This protocol allows a convenient access to the corresponding α‐hydroxy‐β‐indanone esters and α‐hydroxy‐β‐indanone amides with up to
Scheme 1. Diterpenoidalkaloidlappaconine and preparation of lappaconinederivatives.[a] State Key Laboratory of Fine ChemicalsSchool of Pharmaceutical Science and TechnologyDalian University of TechnologyNo. 2 Linggong Road, Ganjingzi District, Dalian, LiaoningProvince 116012, P. R. ChinaE-mail: mengqw@dlut.edu.cnhttp://ceb.dlut.edu.cn/index.html[b] Department of Pharmaceutics, Daqing CampusHarbin
highly enantioselective α-hydroxylation of β-ketoesters using cumene hydroperoxide (CHP) as the oxidant was realized by a chiral (1S,2S)-cyclohexanediamine backbone salen-zirconium(IV) complex as the catalyst. A variety of corresponding chiral α-hydroxy β-ketoesters were obtained in excellent yields (up to 99%) and enantioselectivities (up to 98% ee). The zirconium-catalyzed enantioselective α-hydroxylation
A strategy of visible light‐induced salan‐copper(II)‐catalyzed asymmetric α‐hydroxylation of β‐keto ester with utilization of sustainable air as the oxidant was developed. This protocol allows convenient access to a number of enantioenriched α‐hydroxyl β‐keto esters (up to 95% yield, 96% ee), especially for β‐keto methyl esters that are valuable architectures in pharmaceuticals, including the key intermediate