Process for the preparation of intermediates useful in the synth

Details Process for the preparation of intermediates useful in the synth Process for the preparation of intermediates useful in the synth

1995-12-08

1997-08-26

Gorgos, Kathryn L.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Preparing organic compound

205426, 205431, 205435, 205437, 205441, 205443, 205445, 205455, 205456, 540215, C25B 300

Patent

active

056607113

ABSTRACT:
A process is described for preparing 3-exomethylene cephalosporanic acid derivatives for use in the synthesis of cephalosporin antibiotics such as ceftibuten. The process comprises electrochemical reduction of a compound of the formula (IV) ##STR1## wherein: R.sup.3 is CH.sub.3 C(O)--; ##STR2## is an optional sulfoxide group; n is 2 or 3; R.sup.1 is H and R is H or NHR.sup.2, where R.sup.2 is H or a protecting group selected from C.sub.6 H.sub.5 CH.sub.2 OC(O)--, C.sub.6 H.sub.5 C(O)-- or C.sub.1 -C.sub.6 alkoxy-C(O)--; or wherein R and R.sup.1 together with the carbon atom to which they are attached comprise --C(O)--, and produces the desired 3-exomethylene compounds with low levels of the corresponding 3-methyl tautomers.

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Chemical Abstracts, vol. 122 No. 17 (Apr. 24 1995), abstract No. 213854f.

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