Optically active oxazolidinones as Michael donors for the short and efficient synthesis of β-amino acids containing a cyclopropane ring
作者:Mazen Es-Sayed、Corinna Gratkowski、Norbert Krass、Albert I. Meyers、Armin de Meijere
DOI:10.1016/s0040-4039(00)60569-5
日期:1993.1
The Michael addition of opticallyactive 3, 4-diphenyloxazolidinone 5 to 2′-substituted 2-chloro-2-cyclopropylideneacetates yields 2′-substituted 2-cyclopropyl-1′-(2-oxo-3, 4-diphenyloxazolidin-3-yl)acetates 6-R with excellent trans-selectivity, which upon reductive dehalogenation and subsequent hydrogenolysis give free 2-(1′-amino-cyclopropyl)acetic acids 9.
作者:Wessjohann, Ludger、Krass, Norbert、Yu, Dahai、Meijere, Armin de
DOI:——
日期:——
Preparation of Cyclopropane Analogues of the Natural AntibioticTAN 1057 A/B
作者:Markus Kordes、Michael Brands、Mazen Es-Sayed、Armin de Meijere
DOI:10.1002/ejoc.200500177
日期:2005.7
The two new analogues 2 and 3 of the natural dipeptide antibiotic TAN 1057 A/B (1), both with cyclopropyl containing β-amino acid side chains, were prepared. The synthesis of the corresponding β-amino acids in appropriately protected form (4-Z3 and 5-Z2, respectively) from the correspondingly protected (hydroxyethyl)- (7a) and (hydroxymethyl)-substituted cyclopropylideneacetate (7b), prepared in two