摘要:
A compound of the formula: ##STR1## wherein u represents hydrogen, carboxamido, N-hydroxycarboxamido, carboxy, azido, an aryl, an acylamino, a protected carboxy or an N-alkoxycarboxamido, or, together with v, can represent --S-- or --CH.sub.2 S--; v represents hydrogen, halogen, cyano or an alkylthio, or, together with u, can represent --S-- or --CH.sub.2 S--, or, together with w, can represent --(CH.sub.2).sub.3 CO--; w represents hydrogen, carboamoyl, cyano, carboxy, an N-alkylcarbamoyl, an alkyl, an aryl, a protected carboxy or a heterocycle, or, together with v, can represents --(CH.sub.2).sub.3 CO--; x represents halogen, trifluoromethyl, an alkylthio or an arylthio; y represents hydrogen, a light metal or a carboxylic acid protecting group; and z represents an acyloxy or a heterocycle-thio, each of the above radicals represented by the symbols u, v, w, x, y and z being optionally substituted by halogen or a carbon-, nitrogen-, oxygen- or sulfur-containing functional group, a process for preparing the compound, a pharmaceutical composition containing the compound, and a therapeutical use of the compound.A compound of the formula: ##STR2## wherein u, v, w and x are as defined above, useful as a starting compound for preparing the compound (I) is also provided.
摘要:
A process for preparing 3.beta.-amino-4.beta.-substituted-2-azetidinones, which comprises condensing a 3.alpha.-amino-4.beta.-substituted-2-azetidinone with a trihalogenoacetaldehyde or the reactive derivative thereof to give a 3.alpha.-(2,2,2-trihalogenoethylidene)amino-4.beta.-substituted-2-azetidinones, treating the latter with a base to give a 3-(2,2-dihalogenovinyl)imino-4.beta.-substituted-2-azetidinone, reducing the latter with a metal hydride to give a 3.beta.-(2-halogenovinyl)amino-4.beta.-substituted-2-azetidinone, and hydrolyzing the latter to give the objective compound.
摘要:
A novel process for producing o-hydroxybenzyl alcohols useful as raw materials or intermediates in chemical or pharmaceutical industries, which comprises reacting phenols or naphthols with aromatic boronic acids and aldehydes in the presence of organic carboxylic acids, followed by degradation of the cyclic ester intermediates.
摘要:
An antibacterial cephalosporin hydroxamic acid derivative represented by the following formula (I), processes for its preparation, compositions containing the same as an active ingredient, and a method for killing bacteria by contacting with said compound. ##STR1## (wherein, R is acyl; R.sup.1 is hydrogen or methoxy; R.sup.2 is alkylene; R.sup.3 is hydrogen, aliphatic group or a hydroxy-protecting group; R.sup.4 is hydrogen or amino-protecting group; R.sup.5 is hydrogen, light metal atom or carboxy-protecting group; and X is oxygen, sulfur, or sulfinyl).
摘要:
An antibacterial cephalosporin hydroxamic acid derivative represented by the following formula (I), processes for its preparation, compositions containing the same as an active ingredient, and a method for killing bacteria by contacting with said compound. ##STR1## (wherein, R is acyl; R.sup.1 is hydrogen or methoxy; R.sup.2 is alkylene; R.sup.3 is hydrogen, aliphatic group or a hydroxy-protecting group; R.sup.4 is hydrogen or amino-protecting group; R.sup.5 is hydrogen, light metal atom or carboxy-protecting group; and X is oxygen, sulfur, or sulfinyl).
摘要翻译:由下式(I)表示的抗菌头孢菌素异羟肟酸衍生物,其制备方法,含有该活性成分的组合物,以及通过与所述化合物接触来杀死细菌的方法。 (I)(I)(其中R为酰基; R 1为氢或甲氧基; R 2为亚烷基; R 3为氢,脂族基或羟基保护基; R 4为氢或氨基保护基; R 5为氢, 金属原子或羧基保护基; X是氧,硫或亚磺酰基)。
摘要:
A novel chemical, fluorochlorocyclopropane (I) of the following formula: ##STR1## is prepared by the addition of fluorochlorocarbene to the corresponding olefin (II) of the following formula:CH.sub.2 .dbd.CR.sup.1 -R.sup.2The compound is a useful intermediate for synthesizing some chemicals, e.g., some cephalosporins.(wherein R.sup.1 is hydrogen, halogen, 1 to 8C alkylamino, alkoxy, or alkylthio andR.sup.2 is halogen, 1 to 8C alkylamino, alkoxy, or alkylthio).
摘要:
A process for preparing 3.beta.-amino-4.beta.-substituted-2-azetidinones, which comprises condensing a 3.alpha.-amino-4.beta.-substituted-2-azetidinone with a trihalogenoacetaldehyde or the reactive derivative thereof to give a 3.alpha.-(2,2,2-trihalogenoethylidene)amino-4.beta.-substituted-2-azetidinones, treating the latter with a base to give a 3-(2,2-dihalogenovinyl)imino-4.beta.-substituted-2-azetidinone, reducing the latter with a metal hydride to give a 3.beta.-(2-halogenovinyl)amino-4.beta.-substituted-2-azetidinone, and hydrolyzing the latter to give the objective compound.
摘要:
Compounds of the formula: ##STR1## (where COB is carboxy or protected carboxy and X is hydrogen or nucleophilic group)preparable by oxidation of the corresponding N-nitrosopenicillin derivatives are useful as starting materials for synthesizing known and useful cephalosporins.
摘要:
Antibacterial compounds of the formula ##STR1## (where COB is carboxy or protected carboxy;Hal is halogen;R is amino or protected amino;R' is mercapto-protecting group; andX is nucleophilic group)Are prepared from penicillin 1-oxides having X on its 2-methyl group, and found to be used as starting materials for preparing cephalosporins.
摘要:
5-Mercapto-1H-tetrazole-1-alkanohydroxamic acid, its salts and its esters having the following formula: ##STR1## wherein A is an alkylene group;M is a hydrogen or light metal atom; andR is a hydrogen atom, an alkyl group or a hydroxy-protecting group,and its preparation are disclosed. The compounds are useful as medicines and intermediates.