Cyclization process to form cephem ring

Details Cyclization process to form cephem ring Cyclization process to form cephem ring

1980-02-27

1982-08-24

Rizzo, Nicholas S.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544 22, 424246, C07D50120

Patent

active

043462189

ABSTRACT:
An intermediate represented by 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: 4008230 (1977-02-01), Koppel
patent: 4079181 (1978-03-01), Tsuji et al.
patent: 4147864 (1979-04-01), Woodward et al.
patent: 4160085 (1979-07-01), Tsuji et al.

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