PROCESS FOR 7- -AMINO-7- -METHOXYCEPHALOSPORANIC ACID ESTERS AND RELATED COMPOUNDS

摘要

Process for preparing 7- beta -Amino-7- alpha -methoxycephalosporin esters WHEREIN Z is H or an organic radical, eg. acetoxy, methoxy, carbamoyloxy or 5-thio-1-methyltetrazol; comprising low temperature 7-methoxylation of a 7-(p-nitrobenzyloxycarbamido) cephalosporin ester; reduction of the methoxylation product to an intermediate reduction product; and treatment of the reduction product with silica gel. Methoxy amine nucleus esters are valuable intermediates for synthesis of antibiotics.