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.