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
Discovering organocatalysts with novel framework from terpenoid alkaloids is presented in this paper. Lappaconitine was found to enantioselectively catalyze α-hydroxylation of β-keto esters using tert-butyl hydroperoxide as the oxidant in chloroform to afford the corresponding products in high yields and good enantioselectivity (up to 85% ee).
Axially chiral C-2-symmetric N-heterocyclic carbene (NHC) palladium diaquo complexes 1a and 1b derived from (R)-BINAM are effective catalysts for the enantioselective alpha-hydroxylation of beta-keto esters using oxaziridine 2a as the oxidant to give the corresponding products in high yields along with moderate enantioselectivities (C) 2010 Elsevier Ltd All rights reserved
Visible Light‐Induced Salan‐Copper(II)‐Catalyzed Enantioselective Aerobic α‐Hydroxylation of β‐Keto Esters
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