摘要:
Novel process for preparing azetidinone compound of the formula [III]: ##STR1## wherein R.sup.1 is H or lower alkyl, R.sup.2 and R.sup.3 combine together with the adjacent nitrogen to form heterocyclic group, and R.sup.4 is protected or unprotected hydroxy-substituted lower alkyl, which comprises reacting an alkanamide compound of the formula [I]: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are the same as defined above, with a compound of the formula [II]: ##STR3## wherein L.sup.1 is a leaving group and R.sup.4 is the same as defined above, in the presence of a base, said compound [III] being useful as synthetic intermediate for 1-methylcarbapenem derivative having excellent antibacterial activity.
摘要:
A process for preparing an optically active 4-mercapto-2-pyrrolidone derivative of the formula: ##STR1## wherein a group of the formula: --SR.sup.1 is a protected or unprotected mercapto group, and the group of the formula: .dbd.NR.sup.2 is a protected or unprotected imino group, which comprises subjecting racemic 4-amino-3-mercaptobutyric acid or a salt thereof to optical resolution by using 1-(2,3,4-trichlorophenyl)ethanesulfonic acid, followed by subjecting the product to cyclization reaction after protecting the functional groups thereof, if necessary, and further optionally removing the protecting groups therefrom. The present process is industrially advantageous than conventional processes for preparing optically active 4-mercapto-2-pyrrolidone derivatives which are useful as an intermediate for various medicines such as carbapenem antibacterial agents.
摘要:
1-Methylcarbapenem derivatives of the formula: ##STR1## wherein R.sup.1 is hydrogen atom or a hydroxy-protecting group, R.sup.2 is hydrogen atom or an ester residue, R.sup.3 is hydrogen atom or a lower alkyl group, or salts thereof, which have excellent antimicrobial activities and are useful as an antimicrobial drug.
摘要:
2,2'-Cyclocytidine is prepared by reacting cytidine with a functional derivative of silicon, and hydrolyzing the reaction product under acidic conditions. 1-.beta.-D-Arabinofuranosyl cytosine is prepared by reaction of cytidine with a functional derivative of silicon, followed by alkaline hydrolysis of the reaction product. 2,2'-Cyclocytidine and 1-.beta.-D-arabinofuranosyl cytosine are useful as antitumor and antiviral agents.
摘要:
There is disclosed an azetidinone compound of the formula [I]: ##STR1## wherein Ring B is a benzene ring which may have substituent(s), R.sup.1 is a hydroxy-substituted lower alkyl group which may have substituent(s), X is oxygen atom and the like, Y is oxygen atom and the like, and Z is a methylene group which may have substituent(s), which is useful as a synthetic intermediate of the 1.beta.-methylcarbapenem-type antibacterial agent.
摘要:
There is disclosed an azetidinone compound of the formula �I!: ##STR1## wherein Ring B is a benzene ring which may have substituent(s), R.sup.1 is a hydroxy-substituted lower alkyl group which may have substituent(s), X is oxygen atom and the like, Y is oxygen atom and the like, and Z is a methylene group which may have substituent(s), which is useful as a synthetic intermediate of the 1 .beta.-methylcarbapenem-type antibacterial agent. cl CROSS-REFERENCE TO RELATED APPLICATION
摘要:
Novel process for preparing azetidinone compound of the formula �III!: ##STR1## wherein R.sup.1 is H or lower alkyl, R.sup.2 and R.sup.3 combine together with the adjacent nitrogen to form heterocyclic group, and R.sup.4 is protected or unprotected hydroxy-substituted lower alkyl, which comprises reacting an alkanamide compound of the formula �I!: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are the same as defined above, with a compound of the formula �II!: ##STR3## wherein L.sup.1 is a leaving group and R.sup.4 is the same as defined above, in the presence of a base, said compound �Ill! being useful as synthetic intermediate for 1-methylcarbapenem derivative having excellent antibacterial activity.
摘要:
There is disclosed an azetidinone compound of the formula [I]: ##STR1## wherein Ring B is a benzene ring which may have substituent(s), R.sup.1 is a hydroxy-substituted lower alkyl group which may have substituent(s), X is oxygen atom and the like, Y is oxygen atom and the like, and Z is a methylene group which may have substituent(s), which is useful as a synthetic intermediate of the 1.beta.-methylcarbapenem-type antibacterial agent.
摘要:
Naphthalene derivative of the formula [I]: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and are hydrogen atom, hydroxy group, cyclo-lower alkyloxy group, substituted or unsubstituted lower alkoxy group, or both combine each other to form lower alkylenedioxy group, R.sup.3 is substituted or unsubstituted nitrogen-containing 6-membered heterocyclic group, and groups of the formulae: --OR.sup.4 and --OR.sup.5 are the same or different and are protected or unprotected hydroxy group, processes for preparing thereof, and synthetic intermediates therefor, these compounds have excellent bronchodilating activity, and are useful in the prophylaxis and treatment of asthma.
摘要:
A method for removing tri-substituted silyl group from .beta.-lactam compound having a tri-substituted silyl group-protecting hydroxy group, which comprises treating with an acid and a fluoride selected from alkali metal fluoride, alkaline earth metal fluoride and hydrogenfluoride of organic or inorganic amine, by which the tri-substituted silyl group can be easily and effectively removed under moderate conditions so that the desired compound can be obtained in high yield at low cost.