摘要:
The present invention provides a 1,8-naphthyridine compound of the formula wherein
R is hydrogen, methyl, ethyl or propyl, and a nontoxic pharmaceutically acceptable salt thereof, -an antibacterial agent comprising said 1,8-naphtyridine compound -and a process for prearing a 1,8-naphtyridine compound of the above formula which comprises (A) reacting a compound oftheformula: with a compound of the formula or (B) decomposing a compound of the formula or (C) treating a compound of the formula with an acid or base, and/or reducrively cleaving it.
摘要:
1,8-naphthyridine compounds of the following formula wherein X is a halogen atom especially fluorine or chlorine, R is an ethyl or vinyl group and R 2 is a hydrogen atom or a lower alkyl group containing 1 to 6 carbon atoms, as well as hydrates and nontoxic pharmaceutically acceptable salts thereof. Said compounds have high antibacterial activities against gram-positive and gram-negative bacteria including Pseudomonas aeruginosa and low toxicity and can be used as antibacterial agents.
摘要:
Novel glucosaminyl muramyl peptide derivatives of the formula: wherein X is hydrogen atom or a group of the formula: R 1 CO-, Y is hydroxy group or a group of the formula: -OR 2 , or R, is an alkyl or alkenyl group, R 2 is a lower alkyl group or a phenylalkyl group, R 3 and r 4 are the same or different and are each hydrogen atom or an alkyl group, Y' is hydroxy group or a group of the formula: -OR 2 or (D) and (L) mean the configuration, provided that when X is hydrogen atom, Y is a group of the formula: or and their pharmaceutically acceptable salts. They have excellent biological activities such as potentiating activity of nonspecific resistance to microbial infections and immunostimulant activity and hence are useful in the prophylaxis and treatment of various microbial infections and the treatment of cancer in mammals.