摘要:
Disclosed is a novel process for optically active [(3-amino-3-carboxy)propyl-1]phosphinic acid derivatives, which comprises reacting a Shiff's base with a derivative of vinylphosphinate in the presence of a base, and subjecting the resulting compound to hydrolysis to form the optically active [(3-amino-3-carboxy)propyl-1]phosphinic acid derivatives as either [L-(3-amino-3-carboxy)propyl-1]phosphinic acid derivatives or [D-(3-amino-3-carboxy)propyl-1]phosphinic acid derivatives.
摘要:
Disclosed is a novel process for preparing [(3-amino-3-carboxy)-propyl-1]phosphinic acid derivatives, comprising reacting an alkylalkylphosphonyl halide with a vinylmagnesium halide to form a vinylphosphinic acid derivative, and reacting the vinylphosphinic acid derivative with a Shiff's base to form the aimed product. Also disclosed is a novel intermediate compound formed during the course of the above process, which compound has the general formula: ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are as defined in the specification).
摘要:
Disclosed is a process for preparing antibiotic 1-oxadethiacephalosporins via diazo-species I: ##STR1## wherein: A is acyl; R.sup.1 is H or OCH.sub.3 ; and R.sup.2 is a protecting group.
摘要:
The subject invention includes a 1-oxa-1-dethia-cephalosporin compound represented by the general formula (1) ##STR1## wherein R.sup.1 is a group of the formula: ##STR2## where R.sup.5 is a methyl group, an ethyl group, a carboxymethyl group or a 2-carboxy isopropyl group, or R.sup.1 is a group of the formula: ##STR3## where R.sup.6 is a hydrogen atom, a 4-ethyl-2,3-dioxopiperazine-1-yl group, a 3,4-dihydroxy phenyl group or a 5- and 6-membered heterocyclic radical having 2 ring nitrogens as the sole hetero substituent in the ring and having at least one hetero group on the carbon adjacent to the ring nitrogens.
摘要:
Disclosed is a process for preparing antibiotic 1-oxadethiacephalosporins via diazo-species I: ##STR1## wherein: A is acyl; R.sup.1 is H or OCH.sub.3 ; and R.sup.2 is a protecting group.
摘要:
A new cephalosporin compound is now provided, which is useful as antibacterial agent and is represented by the general formula (I) ##STR1## wherein R.sup.1 is an amino group or a protected amino group; R.sup.2 is a hydrogen atom, a salt-forming cation or a carboxyl-protecting group; R.sup.3 is a hydrogen atom, a halogen atom, a lower alkylthio group, a lower alkoxyl group, a vinyl group or a group of the formula: --CH.sub.2 Y where Y is a hydrogen atom, a halogen atom, an acyloxy group, an unsubstituted or substituted heterocyclic thio group or an unsubstituted or substituted pyridinio group, and a pharmaceutically acceptable salt or ester thereof.
摘要:
A new and useful 1-N-[(S)-.alpha.-hydroxy-.omega.-aminoacyl] derivative of an aminoglycosidic antibiotic, including its deoxy derivative, such as kanamycin B, 3'-deoxyneamine, 3',4'-dideoxyneamine, 3',4'-dideoxyribostamycin or 3',4'-dideoxykanamycin B is now synthetized from the parent substance, aminoglycosidic antiobiotic. The new 1-N-[(S)-.alpha.-hydroxy-.omega.-aminoacyl] derivative shows a wider and/or higher antibacterial activity than the parent substance and is useful in the treatment of infections by gram-negative and gram-positive bacteria, including drug-resistant strains thereof. The preparation of this new derivative may be made by 1-N-acylating the parent aminoglycosidic antibiotic with (S)-.alpha.-hydroxy-.omega.-aminocarboxylic acid with the amino group being protected, and chromatographically separating the acylated products to isolate the desired 1-N-acyl derivative, followed by the removal of the amino-protecting group.
摘要:
A new cyclic ureido-derivative of a deoxystreptamine-containing antibiotic represented by the general formula: ##SPC1##Wherein R.sub.a, R.sub.b and R.sub.c stand for the residues present in the molecule of said antibiotic other than the deoxystreptamine moiety thereof is produced.
摘要:
New 3-N-acyl derivatives of 3-amino-2-hydroxy-4-phenylbutanoic acid are provided, which exhibit analgesic activity and are affective to enhance the morphine analgesia.