Abstract:
PURPOSE: Provided is an isooxazolyl methylene oxazolidinone derivative represented by the formula (I) which is superior in antibacterial activity. Also, a method for preparing the compound is provided. CONSTITUTION: An isooxazoly methylene oxazolidinone derivative is represented by the formula (I): wherein, R is hydrogen, alkyl, halogen such as bromine or chlorine, cyano, alkoxy, hydroxy, carboxy, carbamoyl, N,N'-dimethylcarbamoyl, carbamoyloxy, oxygen, sulfur, thiopene having more than one nitrogen atom, thiazole, aminothiazole, isothiazole, isooxazole, oxazole, tetrazole, 5 or 6-membered unsaturated heterocycle substituent of pyridine, alkyl, halogenalkoxy, benzene ring substituted with cyano or phenoxy group, pharmaceutically acceptable methanesulfonate, fumarate, bromate, citrate, phosphate, sulfate or amine not being salt. The isooxazoly methylene oxazolidinone derivative is prepared by reacting oxazolidine derivative represented by the formula (II) and isooxazole derivative represented by the formula (III) a using a reductant in the presence of a solvent.
Abstract:
PURPOSE: A new penam derivative using indium and zinc and a preparation method thereof are provided CONSTITUTION: A novel penam derivative represented by formula(I) is prepared by reacting 6-oxopenam of the formula(I') with ally halide of the formula (II) or acetylene halide of the formula (III) in the presence of indium or zinc. In the formula(I): R1 is allyl derivative and acetylene derivative; R2 is hydrogen, carboxylic acid salt(sodium salt and potassium salt as inorganic salt, alkyl amine salt, aromatic amine salt as organic salt) or carboxy protecting group(4-methoxy benzyl, diphenylmethyl, 4-nitrobenzyl, useful thing as protecting group of molecule in penicillin or cephalosporin compound field); R3 is hydrogen, halogen, hydroxy, acetoxy group.
Abstract:
PURPOSE: A process for preparing 7-aminodesacetoxycephalosporanic acid useful as an important intermediate for preparing cephalosporin antibiotics is provided which comprises reaction of 3-substituted cephalosporin derivatives in the presence of metal indium or an indium compound. CONSTITUTION: A process comprises the steps of preparing a mixture of 7-aminodesacetoxycephalosporanic acid derivatives (I) and 3-exomethylenecephem derivatives (III) by the reaction of 3-substituted cephalosporin derivative (II) in a mixture solution of an organic solvent and water in the presence of solely indium metal or a mixture of indium metal and metal iodide at 10 to 80°C for 1 to 10 hrs and preparing 7-aminodesacetoxycephalosporanic acid (I) by the reaction of the obtained mixture with tetramethylsilylchloride at 20 to 30°C for 20 to 24 hrs.
Abstract:
This is new cephalosphorin compd. and its parmaceutically acceptable salt of formula(I). In formula, R1 is H, or trityl, tert-butoxycarbonyl, or formyl; R2 H, p-methoxybenzyl, diphenylmethyl or salting compd. such as Na or K; R3 and R4 are same or different, and H, acetyl, or p-methoxybenzyl; X,Y are H, F, Cl, Br, or I; and Q hydrogen, chloro, vinyl, acetoxymethyl, halomethyl, pyridiniummethyl, N- ethyl pyridiniumyl thiomethyl, N- carboxymethyl pyridiniumyl thiomethyl, carbamoyloxymethyl, and N-methyl-tetrazolyl thiomethyl gp. This compd. is prepared by acylation of the aminothiazol compd of (II) with cephalosphorin of (III). This cephem compd. has good antibacterial activity.
Abstract:
Alkenyl cephalosporin derivs. of formula (I) and their pharmaceutical salts are new. 3-cephem compds. were obtained by witting reaction from a phosphonium cpd. of formula (II) with an aldehyde cpd. of formula (III) and then were deacylated to produce 7- amino-3-cephem derivs. The formula (I) derivs. are prepd. by acylation of 7-amino-3-cephem derivs with 2- aminothiazolyl-2-hydroxyimino- acetic acid compds. In (I), R1=H or a protecting gp. as in cephalosporin and penicillin cpds.; R2=H, C1-4 alkyl or substd. alkyl; R3=H or a deriv. of a carboxy gp., an atom for prepn. of a salt or carboxy protecting gp.
Abstract:
The cephene-4-carboxylic acid deriv. of formula (I) is prepd. by reacting an aldehyde cpd. of formula (II) with a phosphonium salt of formula (III) in the presence of a base and a solvent at 0-30 deg.C. In the formulas, R1 is methyl, ethyl, propyl, phenyl or benzyl; R2 is p-methoxy benzyl, diphenyl methyl or allyl; R3 is H, t- butoxy carbonyl or phenyl acetyl; R4 is H, t-butoxy carbonyl, formyl or phenyl acetyl. The solvent is pref. water, dichloromethane, ethylether and/or tetrahydrofurane. The deriv. of (I) is useful for antibiotics.
Abstract:
본 발명은 다음 일반식(Ⅰ)로 표시되는 신규한알 케닐세팔로스포린 및 그 제조방법에 관한 것이다.
식 중 R 1 은 수소, 트리틸, 3급 부톡시카르보닐, 포르밀이고, R 2 는 수소, 탄소수 1~4의 알킬, 알콕시카보닐메틸, 카르복시메틸, 1-카르복시에틸, 1-카르복시-1-메틸에틸, 탄소수 3~9의 시클로알킬기이고, R 3 는 수소, 알킬기, Na, K이고, R 4 및 R 5 는 수소 또는 대페닐메틸, 파라메톡시벤질임. 본 발명의 일반식(Ⅰ)로 표시되는 알케닐세팔로 스포린은 다음과 같은 반응공정에 따라 제조한다.