3-ACYLOXYMETHYL-CEPHEM COMPOUNDS
    16.
    发明专利

    公开(公告)号:CA1103236A

    公开(公告)日:1981-06-16

    申请号:CA352064

    申请日:1980-05-15

    Abstract: An improved process for preparing cephem compounds of the formula: Í! , wherein R1 represents hydrogen or an acyl group and R2 stands for a substituted or unsubstituted pyridinium or a residue of a nitrogen containing heterocyclic thiol, or a salt thereof, which comprises reacting a compound of the formula; ÍI! , wherein W represents acetonyl or a group represented by -X-COOH or -X-OH(in which X is a divalent carbon chain which is able to form a five- or sixmembered ring with or ,which may include a double bond or such an atom or atoms as oxygen, nitrogen or sulfur therein, and on which carbon chain suitable substituent or substituents may be attached) or a salt thereof with a substituted or unsubstituted pyridine or a nitrogen containing heterocyclic thiol. The procedure, using the above defined compound of formula(II) as starting material results in better yields and/or shorter reaction times.

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