Process for the selective preparation of 3-(z)...

Details Process for the selective preparation of 3-(z)... Process for the selective preparation of 3-(z)...

2006-09-26

2006-09-26

Berch, Mark L. (Department: 1624)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C540S222000

Reexamination Certificate

active

07112672

ABSTRACT:
A 3-(Z)-propenyl cephem compound is selectively prepared by reacting a phosphoranylidene cephem compound with acetaldehyde in the presence of a base in a solvent mixture comprising diethyl ether, formula (I), wherein R is a carboxyl protecting group; R1is hydrogen or R2CH2CO—; and R2is ethyl, 2-thiophenyl, phenyl, p-hydroxyphenyl or phenoxy

REFERENCES:
patent: 4694079 (1987-09-01), Crast, Jr.
patent: 4699979 (1987-10-01), Hoshi et al.
patent: 4708955 (1987-11-01), Iimura et al.
patent: 6903211 (2005-06-01), Deshpande et al.

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