Abstract:
The objective of this invention is to provide a process of manufacturing cephem derivatives expressed by the following formula (1), wherein the compound (2) is reacted with an condensing agent of the compound (4) and 1-hydroxy-6-trifluoromethyl benzotriazole(5) and the mixture is acylated with 7-aminocephosporanic acid (3) or its derivatives. ##STR1## According to this invention, a desirous product with high purity may be obtained, which is more cost-saving and industrially feasible than the conventional methods, under the following process steps: Without protecting amino group of organic acid (2), conversion of the reactive derivatives under mild temperature is made and the acylation is directly carried out to obtain the final product.
Abstract:
The present invention relates to 2-(2-substituted pyrrolidin-4-yl)-thio-carbapenem derivatives and pharmaceutically acceptable salts thereof, to a process for preparing the derivatives, an intermediate compound for preparing the derivatives, an antibacterial composition containing the derivatives, and use of the derivatives as an antibacterial agent.
Abstract:
Nucleoside derivatives represented by formula (I); ##STR1## wherein, R.sub.1 represents hydrogen, phosphate or phosphonate group, R.sub.2 represents substituted or unsubstituted pyrimidine or purine base, and Z represents S, SO, SO.sub.2, O or C; or pharmaceutically acceptable salts thereof. Compound (I) can be obtained by reacting a compound of the formula (II); ##STR2## wherein, R.sub.7 represents hydrogen or hydroxy-protecting group, L represents aromatic or nonaromatic acyl, halide or alkoxy, and Z represents S, SO, SO.sub.2, O or C, with a base.
Abstract:
The present invention relates to a mercaptopyrrolidinyl derivative of the following formula ##STR1## suitable for the preparation of carbapenem compounds.