erythritol derivative, was further functionalized and then submitted to stereoselective Passerini reactions, allowing the synthesis of a small library of new molecules. Thanks to the presence of different functional groups, further cyclizations were performed providing bicyclic polyoxygenated heterocycles.
Stereoselective Synthesis of <scp>d</scp>-5-Homo-4-selenoribose as a Versatile Intermediate for 4′-Selenonucleosides
作者:Gyudong Kim、Yoojin Choi、Pramod K. Sahu、Jinha Yu、Shuhao Qu、Dongjoo Lee、Lak Shin Jeong
DOI:10.1021/acs.orglett.5b02393
日期:2015.9.18
Stereoselective synthesis of d-5-homo-4-selenoribose, serving as a versatileintermediate for the synthesis of 4′-selenonucleosides 12a–c, was accomplished using Sharpless asymmetric epoxidation, regioselective cleavage of the α,β-epoxide, and stereoselective reduction of the ketone as the key steps.
d -5 -homo-4-selenoribose的立体选择性合成,是合成4'-selenonucleosides 12a – c的通用中间体,使用Sharpless不对称环氧化,α,β-环氧的区域选择性裂解和立体选择性还原来完成酮是关键步骤。
Low Temperature Isomerisation of (Z<i>)-</i>α,β-Unsaturated Esters into their (<i>E</i>)-Isomers by LiTi(OiPr)<sub>4</sub>(SPh) and LiSPh
作者:Rainer Clauss、Wolfgang Hinz、Roger Hunter
DOI:10.1055/s-1997-694
日期:——
LiTi(OiPr)4(SPh) and LiSPh isomerise a series of (Z)-α,β-unsaturated esters into their (E)-stereoisomers at low temperature (<-30°C) in THF.