Chemical intermediates useful to prepare cephalosporins

Details Chemical intermediates useful to prepare cephalosporins Chemical intermediates useful to prepare cephalosporins

1979-10-15

1981-04-07

Rizzo, Nicholas S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

544 22, 544 24, 544 25, 544 27, 544 28, 544 30, 424246, C07D50120, C07D50136, C07D50104

Patent

active

042607469

ABSTRACT:
7.alpha.-Methoxy-7.beta.-acylamino cephalosporins are prepared from 7.beta.-acylamino cephalosporins through formation of a ketenimine by the action of an acid halide, formation of an addition reaction adduct of this ketenimine, treatment of the adduct with a methoxide to form a 7.alpha.-methoxy ketenimine and hydrolysis of the latter ketenimine.

REFERENCES:
patent: 3843641 (1974-10-01), Christensen et al.
patent: 3860585 (1975-01-01), Carroll et al.
patent: 3960845 (1977-09-01), Yanagisawa et al.
patent: 4014873 (1977-03-01), Christensen et al.
patent: 4051299 (1977-09-01), Shimizu et al.
patent: 4051320 (1977-09-01), Yanagisawa et al.
patent: 4058661 (1977-11-01), Cama et al.
patent: 4086423 (1978-04-01), Firestone et al.

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