Process for the conversion of penam ring system to cepham ring system
The present invention relates to a new process for the preparation of cephalosporin derivative of formula (I) 1 wherein R 1 represents p-methoxybenzyl, p-nitrobenzyl, o-chlorobenzyl or diphenylmethyl; R 2 represents CH 3 or CR a R b COOR c where R a and R b independently represent hydrogen or methyl...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The present invention relates to a new process for the preparation of cephalosporin derivative of formula (I)
1
wherein R
1
represents p-methoxybenzyl, p-nitrobenzyl, o-chlorobenzyl or diphenylmethyl; R
2
represents CH
3
or CR
a
R
b
COOR
c
where R
a
and R
b
independently represent hydrogen or methyl and R
c
represents hydrogen or (C
1
-C
6
) alkyl; R
3
represents hydrogen, acyl, phenacyl, formyl or trityl group. |
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