A Novel Approach to a Precursor of the Carbapenem Antibiotic PS-5 via Aziridine Stereospecific Carbonylation
摘要:
Cobalt cartonyl-catalyzed carbonylative ring expansion of optically pure cis-1-benzyl-3-ethyl-2-hydroxymethylaziridine (5) to trans-beta -lactam (8) afforded a key precursor of the carbapenem antibiotic (+)-PS-5. Aziridine (5) was obtained in both enantiomerically pure forms by Amano PS lipase-catalyzed esterification in n-hexane using vinyl acetate as acyl donor. The stereochemical pathway of the carbonylation reaction was proved by configurational assignments through chemical correlation.
Selectivity in the Addition Reactions of Organometallic Reagents to Aziridine-2-carboxaldehydes: The Effects of Protecting Groups and Substitution Patterns
作者:Aman Kulshrestha、Jennifer M. Schomaker、Daniel Holmes、Richard J. Staples、James E. Jackson、Babak Borhan
DOI:10.1002/chem.201101168
日期:2011.10.24
especially the electronic character and conformational preferences of the nitrogen protectinggroups. To help rationalize the observed stereochemical outcomes, conformational and electronic structural analyses of a series of modelsystems representing the various substitution patterns have been explored by density functional calculations at the B3LYP/6‐31G* level of theory with the SM8 solvation model to account