Patents Represented by Attorney A. Bloom

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  • Process for preparing esters of penicillanic acid sulfone
    Patent number: 4474698
    Abstract: A process for preparing halomethyl esters of penicillanic acid sulfone, intermediates to beta-lactamase inhibitors, from the corresponding substituted thiomethyl and sulfinylmethyl esters and a halogenating agent. The thiomethyl and sulfinylmethyl esters of penicillanic acid sulfone are useful intermediates.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: October 2, 1984
    Assignee: Pfizer Inc.
    Inventors: David L. Hageman, Thomas C. Crawford