摘要:
A 2-substituted cephem derivative represented by the formula ##STR1## wherein R.sup.1 represents a substituted or unsubstituted phenyl group, substituted or unsubstituted phenylmethyl group or substituted or unsubstituted phenoxymethyl group, R.sup.2 represents hydrogen atom or protective group for carboxylic acid and Y represents allyloxy group, benzyloxy group, alkylthio group, carboxyalkylthio group or group of the formula ##STR2## wherein R.sup.4 represents hydrogen atom or lower alkyl group, X represents --O--, --S-- or ##STR3## R.sup.5 represents hydrogen atom, a lower alkyl group or phenyl group and R.sup.6 represents hydrogen atom or lower alkyl group, and a process for preparing the derivatives.
摘要:
An object of the invention is to provide a process for preparing a 3-substituted cephem compound from an allenyl-.beta.-lactam compound which can be easily produced from an inexpensive penicillin compound by a simple reaction procedure.The process of the invention comprises reacting an allenyl-.beta.-lactam compound with an organohalogen compound in the presence of a metal having a standard oxidation-reduction potential of -0.3 (V/SCE) or less in an amount at least equimolar with the allenyl-.beta.-lactam compound and 0.0001 to 0.5 mole, per mole of the allenyl-.beta.-lactam compound, of a metal compound having a higher standard oxidation-reduction potential than said metal.
摘要:
A process for preparing cephalosporin compounds represented by the formula ##STR1## wherein R.sup.1 represents an alkyl group, alkenyl group, substituted or unsubstituted aryl group, substituted or unsubstituted arylmethyl group or substituted or unsubstituted phenoxymethyl group, R.sup.2 represents a carboxyl group or protected carboxyl group, and Y represents the residue of a nucleophilic reagent.
摘要:
An azetidinone compound represented by the formula ##STR1## wherein R.sup.1 represents a substituted or unsubstituted phenyl group, R.sup.2 represents a carboxyl-protecting group, X represents a hydrogen atom or chlorine atom and Y represents --I, --ONO.sub.2, --OH, ##STR2## or --SR.sup.4 in which R.sup.3 is a lower alkyl group or --OR.sup.5 (wherein R.sup.5 is a halogen-containing lower alkyl group) and R.sup.4 is a substituted or unsubstituted, 5-membered aromatic heterocyclic residue containing sulphur and/or nitrogen atom or atoms.
摘要:
2.alpha.-Methyl-2.beta.-(1,2,3-triazol-1-yl)methylpenam-3.alpha.-carboxylic acid derivatives are prepared by reacting a penicillanic acid sulfoxide derivative of the formula ##STR1## wherein R is a penicillin carboxyl protecting group, and R.sub.1 is hydrogen or halogen, R.sub.2 is hydrogen, lower alkyl or the like with a triazole derivative of the formula ##STR2## wherein R.sub.3 and R.sub.4 are hydrogen, trialkylsilyl, lower alkyl, lower alkoxy or the like and R.sub.5 is hydrogen or silyl substituted with 3 groups selected from the class consisting of lower alkyl, benzyl and phenyl in a solvent.
摘要:
A process for preparing an alkoxyphenol represented by the formula: ##STR1## wherein R is hydrogen, alkyl having 1 to 4 carbon atoms, formyl, hydroxymethyl, alkoxymethyl, dialkoxymethyl, acetoxymethyl or diacetoxymethyl, R' is alkyl having 1 to 4 carbon atoms, and n is an integer of 1 to 5, characterized in that a phenol halide represented by the formula: ##STR2## wherein R and n are as defined above, and X is chlorine or bromine is reacted, in the presence of a copper salt serving as a catalyst and of a solvent, with a product prepared by heating, in the presence of a dehydrating agent, an alkali metal hydroxide and a compound of the formula R'OH wherein R' is as defined above.
摘要:
This invention provides a process for preparing a thiazolinoazetidinone derivative represented by the formula ##STR1## wherein R.sup.1 represents a hydrogen atom, alkyl group, alkenyl group, aralkyl group, aryl group or aryloxymethyl group, the process comprising electrolyzing in a solvent a compound represented by the formula ##STR2## wherein R.sup.1 is as defined above, R.sup.2 represents a carboxyl group or protected carboxyl group, and R.sup.3 and R.sup.4 represent a hydrogen atom, halogen atom or acetoxy group.
摘要:
A process for preparing 2-pentynyl ether represented by the formulaCH.sub.3 CH.sub.2 C.tbd.CCH.sub.2 ORwherein R is tetrahydropyranyl and methoxyethyl characterized by reacting propargyl ether represented by the formula HC.tbd.CCH.sub.2 OR wherein R is as defined above with an ethyl halide in a nonprotonic polar solvent in the presence of a metal hydride.
摘要:
A 2-(2-pentynyl) cyclopentanol derivative represented by the formula ##STR1## wherein R.sub.2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and process for preparing the same.
摘要:
A 2-cyclopentenone derivative represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and R.sub.4 is 2-pentenyl or 2-pentynyl, and process for preparing the same.