Cephalosporin compounds, processes for their preparation and antibacterial agents

Abstract From the Canadian patent

The present invention provides a compound having the formula (II), wherein R2 is a hydrogen atom or an amino-protecting group selected from a tri-alkylsilyl group, an acyl group a, chloroacetyl group, a p-methoxybenzyloxycarbonyl group a t-, butoxycarbonyl group, a 2,2,2-trichloroethoxycarbonyl group a p-, nitrobenzyloxycarbonyl group, an aralkyl group a p-methoxybenzyl, group, a p-nitrobenzyl group a benzhydryl group and a trityl, group and each of R3 and R4 is a hydrogen atom or a hydroxylprotecting group, trialkylsily group, a benzhydryl group a .beta. -, methylsulfonylethyl group, a phenacyl group a p-methoxybenzyl, group, a t-butyl group a p-nitrobenzyl group, and a 2,2,2-, …