The reaction of dichlorocarbene with β-ethanolamines stereospecific synthesis of epoxides
作者:Luís Castedo、José L. Castro、Ricardo Riguera
DOI:10.1016/s0040-4039(01)91561-8
日期:——
Optically pure β-ethanolamines were converted into epoxides in good yield and with high e.e. ( ⩾, 95%) by reaction with dichlorocarbene. By this method α-aminoacids were successfully converted into synthetically useful epoxides.
Towards a Greener Epoxidation Method: Use of Water-Surfactant Media and Catalyst Recycling in the Platinum-Catalyzed Asymmetric Epoxidation of Terminal Alkenes with Hydrogen Peroxide
Remarkable improvements in enantioselectivity as well as recycle were observed in the catalytic asymmetric epoxidation of terminal alkenes with a chiral, electron-poor platinum(II) catalyst with hydrogen peroxide as terminal oxidant in water-surfactant media.
Ring-Strain-Enabled Catalytic Asymmetric Umpolung C–O Bond-Forming Reactions of 1,2-Oxazetidines for the Synthesis of Functionalized Chiral Ethers
作者:Binyu Wu、Jinggang Yang、Min Gao、Lin Hu
DOI:10.1021/acs.orglett.0c01916
日期:2020.7.17
An unprecedented catalyticasymmetric umpolung C–O bond-forming reaction of N-nosyl 1,2-oxazetidines with β-keto esters has been achieved in the presence of a chiral phase-transfer catalyst, allowing access to a range of highly functionalized chiral ethers bearing quaternary and no adjacent stereogenic centers with high yields, excellent enantioselectivities, and diastereoselectivities (up to 97% ee
Synthesis of optically active forms of ipsdienol and ipsenol
作者:K. Mori、T. Takigawa、T. Matsuo
DOI:10.1016/s0040-4020(01)93705-6
日期:1979.1
(R)-(-)-Ipsdienol 1″ and its antipode 1' were synthesized from (R)-(+)-glyceraldehyde acetonide and (R)-(+)-malic acid, respectively. This established the S-configuration of the naturally occurring (+)-ipsdienol. A new synthesis of (R)-(+)-ipsenol 2″ and its antipode 2' was also described. Chiral epoxides were shown to be useful intermediates for the synthesis of these chiral alcohols.