Synthesis of chiral epoxy alcohols by use of baker's yeast
摘要:
Synthesis of optically active 3,4-epoxy-4-phenyl-2-butanols, which are expected to be useful intermediates for the synthesis of biologically active compounds such as beta-blocker, was achieved by asymmetric reduction of 3,4-epoxy-4-phenyl-2-butanone with baker's yeast.
Stereodivergent Access to Enantioenriched Epoxy Alcohols with Three Stereogenic Centers via Ruthenium-Catalyzed Transfer Hydrogenation
作者:Zhifei Zhao、Prasanta Ray Bagdi、Shuang Yang、Jinggong Liu、Weici Xu、Xinqiang Fang
DOI:10.1021/acs.orglett.9b01789
日期:2019.7.19
technique of stereodivergent reaction on racemic mixtures (stereodivergent RRM) was employed for the first time in ruthenium complex catalyzed transferhydrogenation of racemic epoxy ketones, providing a new and very simple method that allows access to enantioenriched epoxy alcohols with three stereogenic centers in a one-step fashion. The protocol features simplereaction conditions, practical operation
Switchable asymmetric bio-epoxidation of α,β-unsaturated ketones
作者:Yu-Chang Liu、Zhong-Liu Wu
DOI:10.1039/c5cc07548c
日期:——
Efficient asymmetric bio-epoxidation of electron-deficient [small alpha],[small beta]-unsaturated ketones was realized via a tandem reduction-epoxidation-dehydrogenation cascade, which proceeds in a switchable manner to afford either chiral epoxy ketones or allylic epoxy alcohols...
Highly Regio- and Stereoselective Intramolecular Rearrangement of Glycidol Acetal to Alkoxy Cyclic Acetals
作者:Meera Johny、Rose Mary Philip、Goreti Rajendar
DOI:10.1021/acs.orglett.2c02397
日期:2022.8.26
Lewis acid activation of acetal generates an oxocarbenium ion that initiates the epoxide ring-opening event, giving the bicyclic [3,1,0]epoxonium ion intermediate that undergoes exo/endo-selective opening by a tethered alkoxide. Mechanistic insights into preferential acetal activation over the epoxide were obtained by crossover experiments. The method was applied in the total synthesis of parvistone