Are the known ?2-cephems inactive as antibiotics because of an unfavourable steric orientation of their 4?-carboxylic group? Synthesis and biology of two ?2-cephem-4?-carboxylic acids
作者:Nissim C. Cohen、Ivan Ernest、Riccardo Scartazzini、Peter Wirz、Hans Fritz、Hermann Fuhrer、Grety Rihs
DOI:10.1002/hlca.19870700732
日期:1987.11.4
Two representatives of the yet unknown type of Δ2-cephem-4β-carboxylic acids were prepared. Contrarily to the prediction based on the activity model of Cohen, both acids proved inactive as antibiotics. Possible reasons for this discrepancy are briefly discussed.