7-Oxo-4-thia-1-azabicyclo(3,2,0)heptane derivatives.

摘要

Compounds of the formula la and their tautomers Ib
<Chemistry id="chema01" num="0001"><Image id="ia01" he="33" wi="102" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>in which formulae R represents a carboxyl esterifying group are described, as well as processes and intermediates for their manufacture. la and Ib are valuable starting materials for the preparation of various derivatives substituted at position 3 that possess antibacterial properties.