摘要:
The present invention provides a process for producing a .beta.-lactam halide compound represented by the general formula (2) which process is characterized in that the hydroxyl group of a .beta.-lactam halide compound represented by the general formula (1) is substituted with a halogen atom or a leaving group. ##STR1##
摘要:
The present invention provides a thiazolinoazetidinone derivative represented by the formula ##STR1## wherein R.sup.1 is phenyl having or not having substituent(s), methyl having or not having substituent(s) or ##STR2## group, R.sup.3 being phenyl having or not having substituent(s), and R.sup.2 is a hydrogen atom or carboxylic acid protective group, and a process for preparing the same.The present invention further provides a process for preparing a 2-exo-methylenepenam derivative characterized by hydrolyzing the thiazoline ring of a thiazolinoazetidinone derivative of the above formula (1) to effect recyclization and obtain a 2-exo-methylenepenam derivative represented by the formula ##STR3## wherein R.sup.1 and R.sup.2 are as defined above.
摘要:
Disclosed is a method of producing a 3-exomethylenecepham of the formula ##STR1## wherein R.sup.1 is amino or substituted amino and R.sup.2 is a carboxy-protecting group comprising reacting a cephem of the formula ##STR2## wherein R.sup.1 and R.sup.2 are as defined above and X is halogen with lead metal while maintaining the pH of the reaction system at about 0.1 to 8. The cephem (I) may be reacted with a catalytic amount of lead metal or a lead compound in the presence of a metal having a greater ionization tendency than lead.
摘要:
The present invention provides a process for preparing a 1,1-disubstituted ethylene derivative of the formula ##STR1## which comprises reacting lead with a carbinol derivative of the formula ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, X, Y, m and n are defined in the specification. The reaction is conducted more advantageously in the presence of a metal having higher ionization tendency than lead.
摘要:
A process for preparing a 3-alkoxymethylcephem compound represented by the formula (II) ##STR1## where R.sub.1 is a hydrogen atom, amino or protected amino, R.sub.3 is a hydrogen atom or carboxylic acid protective group and R.sub.4 is lower alkyl, which process is characterized in that a 3-thiomethylcephem compound represented by the formula (I) ##STR2## where R.sub.1 and R.sub.3 are as defined above and R.sub.2 is aryl which may have a substituent, is electrolytically oxidized in an electrooxidation reaction system in the presence of a lower alcohol using as a positive electrode, a material selected from the group consisting of platinum, tin, aluminum, stainless steel, nickel, lead oxide, carbon, iron oxide and titanium, to obtain the 3-alkoxymethylcephem compound.
摘要:
A process for preparing a 3-halogenated cephem derivative represented by the formula (2), characterized by causing a halogenating reagent to act on an allenyl .beta.-lactam compound represented by the formula (1) in the presence of a cuprous salt or cupric salt to obtain the 3-halogenated cephem derivative ##STR1## wherein R.sup.1 is a hydrogen atom, amino or protected amino, R.sup.2 is a hydrogen atom, halogen atom, lower alkoxyl, lower acyl, lower alkyl, lower alkyl having at least one selected from hydroxyl and protected hydroxyl as a substituent, hydroxyl or protected hydroxyl, R.sup.3 is a hydrogen atom or carboxylic acid protecting group, R.sup.4 is an aromatic compound residue which may have a substituent or nitrogen-containing aromatic heterocyclic compound residue which may have a substituent, and n is 0 to 2 ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above, X is a halogen atom.
摘要:
A process for preparing a 2-isocephem derivative characterized in that a thioacetic acid derivative which itself is basic or a mixture of a base and a thioacetic acid derivative is caused to act on a 2-azetidinyl-3,4-dihalogeno-2-butenoic acid compound represented by the general formula (1) in a water-containing organic solvent to obtain a 3-halomethyl-2-isocephem derivative represented by the general formula (2), and a process for preparing a 2-oxaisocephem derivative characterized in that a base is caused to act on a 2-azetidinyl-3,4-dihalogeno-2-butenoic acid compound represented by the general formula (1) in a water-containing organic solvent to obtain a 3-halomethyl-2-oxaisocephem derivative represented by the general formula (3) ##STR1## wherein R.sup.1 is a hydrogen atom, amino or protected amino, R.sup.2 is a hydrogen atom or lower alkoxyl, R.sup.1 and R.sup.2, when taken together, form a cyclic amino protecting group, R.sup.3 is a hydrogen atom or carboxylic acid protecting group, W is a leaving group, and X and Y are the same or different and are each a halogen atom ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and X are the same as above, ##STR3## wherein R.sup.1, R.sup.2, R.sup.3 and X are the same as above.
摘要:
An organic polymer ferromagnetic material characterized in that the material comprises a polymer obtained by subjecting to plasma polymerization or oxidation polymerization a methane derivative having two substituents and represented by the formula ##STR1## wherein A is an electron accepting group, and B is an electron donating group, or by copolymerizing the methane derivative with a diarylmethane derivative represented by the formula ##STR2## wherein R.sup.1 is a substituted or unsubstituted phenyl group by plasma polymerization or oxidation polymerization.
摘要:
The present invention provides a thiazolinoazetidinone derivative represented by the formula ##STR1## wherein R.sup.1 is phenyl having or not having substituent(s), methyl having or not having substituent(s) or ##STR2## group, R.sup.3 being phenyl having or not having substituent(s), and R.sup.2 is a hydrogen atom or carboxylic acid protective group, and a process for preparing the same.The present invention further provides a process for preparing a 2-exo-methylenepenam derivative characterized by hydrolyzing the thiazoline ring of a thiazolinoazetidinone derivative of the above formula (1) to effect recyclization and obtain a 2-exo-methylenepenam derivative represented by the formula ##STR3## wherein R.sup.1 and R.sup.2 are as defined above.
摘要:
The present invention provides a process for preparing a 3-formylcephem derivative represented by the formula (2) ##STR1## which comprises oxidizing in the presence of oxygen a 3-halomethylcephem derivative represented by the formula (1) ##STR2## wherein R.sup.1 is amino group or protected amino group, R.sup.2 is hydrogen atom or a carboxylic acid protective group, X is halogen atom.