摘要:
A process for producing an oxide having a higher degree of oxidation than an alcohol, characterized by depositing the alcohol compound and an oxidation catalyst on silica gel and oxidizing the compound with an oxidizing agent; and a process for producing an oxide having a higher degree of oxidation than an alcohol, characterized by depositing the alcohol compound on silica gel and then electrolytically oxidizing the compound.
摘要:
A process for the preparation of 3-alkenylcephem or 3-norcephem compounds represented by general formula (3), characterized by treating a 3-cephem compound of general formula (1) in a solvent with an alkenyl halide of general formula (2), a nickel catalyst, a metal having a standard redox potential of -0.3 (V/SCE) or below , and a compound of a metal having a standard redox potential higher than that of the above metal. Formula (1) (wherein R1 is hydrogen or the like; R2 is hydrogen or the like; R3 is hydrogen or a carboxyl-protecting group; and X is halogeno or the like). (Formula 2) R4-Y wherein R4 is optionally substituted 1-alkenyl; and Y is halogeno. Formula (3) (wherein R?1, R2, and R3¿ are each as defined above; and R5 is hydrogen or optionally substituted 1-alkenyl).
摘要:
A process for the preparation of an allenyl-β-lactam compound which comprises reacting the hydroxyl group of a β-lactam compound of general formula (1) with a reactive functional derivative of a sulfonic acid of the general formula (2): R5-SO2-X to form a β-lactam compound of general formula (3) and reacting the formed compound with a basic anion-exchange resin containing a tertiary organic base immobilized thereon to attain the preparation of an allenyl-β-lactam compound of general formula (4) and the stable isolation thereof from the reaction mixture in a high yield at a high purity. Another process for the preparation of an allenyl-β-lactam compound which comprises reacting the hydroxyl group of a β-lactam compound of general formula (1) with a reactive functional derivative of a sulfonic acid of the general formula (2): R5-SO2-X to form a β-lactam compound of general formula (3), reacting the formed compound with a tertiary organic base to form an allenyl-β-lactam compound of general formula (4) and treating the resulting reaction mixture with both an acidic cation-exchange resin and a basic anion-exchange resin either alternately or simultaneously to isolate the compound of general formula (4) from the reaction mixture stably. A process of preparing a 3-halocephem derivative of general formula (6) by reacting an allenyl-β-lactam compound of general formula (4) with a halogenating agent in the presence of a sulfinate or thiolate ion scavenger.
摘要:
A process for the preparation of a 3-vinylcephem compound, characterized by treating a protected 3-vinylcephem derivative of the general formula (1) in an organic solvent in the presence of a perhalogenic acid and an organic protonic acid to thereby obtain a 3-vinylcephem compound of formula (2). In general formula (1), R?1, R2 and R3¿ are each hydrogen or optionally substituted arylmethyl, with the proviso that all of R?1, R2 and R3¿ must not be hydrogen.
摘要:
A process for the preparation of 3-sulfonyloxy-3-cephem compounds of general formula (3), characterized by reacting a 3-hydroxy-3-cephem compound of general formula (1) with a sulfonic acid halide of general formula (2) :R4SO2x, in an organic solvent in the presence of an alkali metal carbonate or an alkaline earth metal carbonate wherein R1 to R4 and X are each as defined in the description.
摘要:
A process for the preparation of 3-halogenocephem derivatives of general formula (2), characterized by reacting an allenyl-β-lactam of general formula (1) with a halogenating agent in the presence of a cuprous or cupric salt: [wherein R1 is hydrogen, amino, or protected amino; R2 is hydrogen, halogeno, lower alkoxy, lower acyl, lower alkyl, lower alkyl having at least one group selected between hydroxyl and protected hydroxyl groups as a substituent, hydroxyl, or protected hydroxyl; R3 is hydrogen or a carboxyl-protecting group; R4 is a residue of an optionally substituted aromatic or nitrogeneous heteroaromatic compound; and n is an integer of 0 to 2] [wherein R?1, R2 and R3¿ are each as defined above; and X is halogeno].
摘要:
A process for producing beta-lactam derivatives, which comprises reacting a beta-lactam derivative wherein the carboxyl group is protected and which is represented by the general formula: A-COO-X (wherein A represents a beta-lactam derivative residue, and X represents a benzyl group having an electron-donating group in the phenyl group, a diphenylmethyl group optionally having an electron-donating group in the phenyl group, or a tert-butyl group) with a phenol to obtain a beta-lactam derivative represented by the general formula: A-COOH (wherein A is the same as defined above).
摘要:
3-Halogenomethylcephem compounds represented by general formula (2) or salts thereof, produced by reacting a 7-amino-3-halogenomethylcephem compound represented by general formula (1) or a salt thereof with a phenol derivative to remove the 4-position carboxy-protective group; and 3-thiomethylcephem compounds represented by general formula (4) or salts thereof, produced by reacting the 3-halogenomethylcephem compound represented by formula (2) or its salt with either a thiol compound represented by general formula (3): R2S-M or a salt thereof, wherein X?1, R1, R2¿, and M are each as defined in the description.
摘要:
A process for the preparation of 3-cephem compounds, characterized by reacting a β-lactam compound represented by general formula (1) with a phosphorus halide compound in the presence of an organic base to form an imino-β-lactam compound represented by general formula (2), adding a phenol to the resulting reaction system to conduct alcoholysis simultaneously with the deblocking of the carboxylate ester, and thus obtaining a 3-cephem compound represented by general formula (3) or a salt thereof, wherein R1, R2, R3 and X are each as defined in the description.