Abstract:
The penams(I) and cephams(II) (e.g. R =PhCH2, PhOCH2, 2-thienylmethyl, protected phCHNH2; R1 = CH2CCl3, Me; R2 = Cl, Br, OAc, OMe, SCN), useful as antimicrobial agent, were prepd. by cyclizing(III) with a suitable reagent for providing R2. III was prepd. by reaction of thiol compound and 2-methyl-2-lower alkyl-6-substituted penam-3-carboxylicacid-1-oxide. Subsequent reaction of I and II included deacylation, ester hydrolysis, S-oxidn. and substitution at R2..
Abstract:
The title compds.(If; R1α = lower alkenoyl; A = lower alkyene), useful as antibiotics and bactericides, were prepd. by the reaction of Ie≮HN(OH)AP(O)(OH)2≉ and R1α-OH. phosphonylation of R1N(0R2)AX1≮R1 = olwer alkoxycarbonyl, a enesulfonyl; R2 = ar(lower)alkyl; X1 = acid residue≉wich POR3(0R3)2 [R3 = H, ester residue; R3 α=ester residue, followed by hy2 drolysis to give If.
Abstract:
The title compds.(If; R1α = olwer alkanoyl; A = lower alkylene or lower alkenyiene),useful as antibiotics and bactericides, were prepd. by the reaction of HN(OH)AP(O)(0H)2≮Ie≉and R1α-OH. Ie was prepd. by the hydrolysis of R1N(OR2)A-P(O)(OR3α)2 ≮Ib; R1 = H, lower alkoxycarbonyl, arene suifonyl ; R2 = H, ar(olwer)alkyl, lower alkoxycarbonyl; R3α = ester residue obtained from the reaction of X2AP(O)(OR3α)2 2≮ X2 = acid residue≉and R1NH(OR2).
Abstract:
Title compd. I(R1 = amino or substd. amino, R2 = carboxyl or substd. carboxyl, R3 = lower alkyl, Y = residue of nucleophile) was prepared from compd. II(Z = radical which is convertible to residue of nucleophile) or compd. III, which were prepared by reacting 2-methyl-2-lower alkyl-6- substd. penam-3-carboxylic acid-1-oxide with thiol or reacting above product with ammonia or amine. compd. I has antibacterial activity.
Abstract:
2-alkyl-7-aminoacylamino-2(or 3)-cephem-4-carboxylic acid(I; R1 = acyl aminoacylamino; R2 = alkyl; X = S, SO) and their CO2H derivs., having antibacterial property, were prepd. by elimination of amino protecting group in the 2-alkyl-7-substituted acylamino-2(or 3)-cephem-4-carboxylic acid (II; R1 = aminoacylamino), their CO2H derivs., or salts.
Abstract:
An antibiotic FR-1923 substance which is active against a pathogenic bacteria and useful as an effective antimicrobial agent in treatment of infections disease caused by bacteria, the antibiotic FR-1923 substance being produced by fermentation of Nocardia uniformis var. tsuyamanensis ATCC 21806 and its mutant in a nutrient medium.
Abstract:
An antibiotic WS-4545 and the acyl derivatives thereof, which are active against a pathogenic bacteria and useful as an effective antimicrobial agent in treatment of infectious diseases caused by bacteria, the antibiotic WS-4545 being produced by fermentation of Streptomyces sapporonensis ATCC 21532 and its mutants in a nutrient medium and the acyl derivatives of said antibiotic being prepared by acylating said antibiotic with an acylating agent.