Cyclization to form cephem ring and azetidinone intermediates th

Details Cyclization to form cephem ring and azetidinone intermediates th Cyclization to form cephem ring and azetidinone intermediates th

1982-01-11

1984-04-03

Berch, Mark L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2602454, 2603303, 2603309, 544182, 544215, 544238, 544335, 544336, 546275, C07D20508, C07D40304, C07D40112, C07D40512

Patent

active

044406835

ABSTRACT:
An intermediate represented by following formula for synthesizing 3-hydroxy-3-cephem compounds. ##STR1## wherein A and B each is a hydrogen or amine substituent; R is a hydrogen or thiol substituent; Nal 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 azetidimethiazoline bicyclic ring; and the enamine derivatives thereof.

REFERENCES:
patent: 4130557 (1978-12-01), Hamashima
patent: 4147864 (1979-04-01), Woodward
patent: 4206120 (1980-06-01), Hunt
patent: 4264597 (1981-04-01), Hashimoto

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