From Alkenes to Isoxazolines via Copper-Mediated Alkene Cleavage and Dipolar Cycloaddition
作者:Mingchun Gao、Yuansheng Gan、Bin Xu
DOI:10.1021/acs.orglett.9b02748
日期:2019.9.20
transformation is reported, along with selective C═C double bond cleavage and dipolar cycloaddition reaction from simple alkenes and inexpensive copper nitrate. Various transformations demonstrate the generality of this method. Further mechanistic investigation indicates a novel ionic pathway for alkene cleavage and highlights the coeffect of iodide and boric acid as additives on the inhibition of well-documented
Microbial Resolution of 2-Hydroxy-3-nitropropionic Acid for Synthesis of Optically Active Isoserine
作者:Yoshihiko YASOHARA、Junzo HASEGAWA
DOI:10.1271/bbb.65.1258
日期:2001.1
The biocatalytic stereoselective hydrolysis of 2-hydroxy-3-nitropropionic acid esters was studied. Forty enzymes and three hundred microorganism strains were examined for their ability to hydrolyze ethyl 2-hydroxy-3-nitropropionic acid. Nocardia globerula IFO13150 gave n-butyl (R)-2-hydroxy-3-nitropropionate with a 92% enantiomeric excess (ee) and the corresponding carboxylic acid with a 92%ee, which