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US 5,856,474 AGranted
Cephalosporin synthesis
AssigneeBiochemie Gesellschaft m.b.H.
InventorsGerd Ascher, Johannes Ludescher, Hubert Sturm, Josef Wieser
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Abstract
Cephalosporin derivatives of formula ##STR1## wherein R.sub.1 signifies hydrogen or a silyl protecting group, processes for their production and their use as intermediate products.
Claims18
A compound of formula ##STR34## wherein R.sup.d denotes hydrogen or a silyl group;
- R.sup.a denotes hydrogen, if R.sup.d denotes hydrogen;
- or,
- R.sup.a denotes hydrogen or a silyl group, if R.sup.d denotes a silyl group;
- and
- R.sup.b and R.sup.c together denote the oxo group;
- in free form or in salt form.
3 more elements
A method of preparing a cephalosporin, which comprises preparing a compound of formula 1A as an intermediate ##STR36## wherein R.sup.d denotes hydrogen or a silyl group;
- R.sup.a denotes hydrogen, if R.sup.d denotes hydrogen;
- or,
- R.sup.a denotes hydrogen or a silyl group, if R.sup.d denotes a silyl group;
- and
- R.sup.b and R.sup.c together denote the oxo group;
- in free form or in salt form.
3 more elements
Dependencies are inferred from the claim text.