Abstract:
proline derivative of formula (I) is prepared by reacting ethyl- 2-oxo-4- phenylbutenoate of formula (II) with L- alanyl-L-proline of formula (III) in the presence of a reducing agent selected from NaBH3CN or a mixture of Pd/C and H2 gas. The cpd. (I) has an angiotensin-converting enzyme inhibiting activity, and is useful as a hypotensive agent.
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:
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 hydrogen, p-methoxybenzyl, diphenylmethyl, or salting compd. such as Na or K; R3 and R4 are same or different, and H, p-methoxybenzyl or diphenylmethyl; and Q hydrogen, chloro, vinyl, acetoxymethyl, halomethyl, N- ethylpyridiniumylthiomethyl, N- carboxymethyl pyridiniumyl thiomethyl, and N- methyl- tetrazolyl thiomethyl gp. This cephem compd. manufacturing method comprises A) condensing the amine compd. of (VIII) with ketone of (VII) and producing the compd of (II); and B) acylating the aminothiazol compd of (II) with cephalosphorin of (III). This cephem compd. has good antibacterial activity.
Abstract:
Pyridonium 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:
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.