作者:Marc Lang、Ernst Hungerbühler、Peter Schneider、Riccardo Scartazzini、Werner Tosch、Edward A. Konopka、Oto Zak
DOI:10.1002/hlca.19860690709
日期:1986.10.29
In continuation of our work on penem antibiotics, novel chiral (5R,6S)-2-(1′-aminoalkyl)-6-(hydroxyalkyl)-derivatives 1 have been synthesized by two essentially different strategies. Whereas the starting materials for 1a-f, azetidinones 2 and 5, were obtained from chiral building blocks (6-aminopenicillanic acid and L-threonine, resp.), the one for 1g, azetidinone 9, was derived from racemic 4-acetoxyazetidinone
The invention relates to an improved process for the preparation of compounds of formula ##STR1## or salts thereof, starting from compounds of formulae ##STR2## via compounds of formulae ##STR3## in which compounds R.sub.1 is hydrogen or lower alkyl, R.sub.2 is an organic radical which may carry a functional group which may be protected by a customary protective group R.sub.2.sup.o, R.sub.3 is hydrogen or a customary carboxyl protective group R.sub.3.sup.o, W is a group which can be replaced by a thiocarboxylic acid radical of formula III, and Z is oxygen or sulfur.
Die Erfindung betrifft das kristalline Monohydrat der (5R,6S)-2-Aminomethyl-6-[(1R)-1-hydroxyäthyl]-2-penem-3-carbonsäure und Verfahren zur Herstellung desselben. Die Substanz ist zur Behandlung von Infektionserkrankungen geeignet.