De-esterification process

Details De-esterification process De-esterification process

1999-07-13

2000-08-22

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540222, 540225, 540227, 540228, C07D49900, C07D50102

Patent

active

061074810

ABSTRACT:
A process to prepare the E isomer of a 3-substituted (6R,7R)-7-phenyl-acetamido-ceph-3-em-4-carboxylic acid from a mixture of the E and Z-isomer of either the corresponding tert-butyl or the corresponding 4-methoxybenzyl ester of a 3-substituted (6R,7R)-7-phenylacetamido-ceph-3-em-4-carboxylate, characterized by the application of a compound selected from the group titanium tetrachloride, tin tetrachloride and tellurium tetrachloride.

REFERENCES:
patent: 4985554 (1991-01-01), Verweig et al.
patent: 5922861 (1999-07-01), De Vroom et al.

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