Cyclization to form cephem ring and intermediates therefor

Details Cyclization to form cephem ring and intermediates therefor Cyclization to form cephem ring and intermediates therefor

1980-02-27

1982-06-01

Berch, Mark L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

544182, 544216, 544238, 544333, 544405, 544 16, 546271, 260239A, C07D48704

Patent

active

043327222

ABSTRACT:
An intermediate represented by the following formula, for synthesizing --3-hydroxy-3-cephem compounds. ##STR1## wherein A and B each is a hydrogen or amino substituent; R is a hydrogen or thiol substituent; Hal is a halogen; X is a hydroxy or carboxy protecting group; the broken line between A and R shows that when R and B are hydrogens, and A is a carboxylic acyl, the substituents can be combined to form an azetidinothiazoline bicyclic ring; and the enamine derivatives thereof.

REFERENCES:
patent: 4077969 (1978-03-01), Bernardi
patent: 4077970 (1978-03-01), Foglio et al.
patent: 4130557 (1978-12-01), Hamashima

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