专利号:US-4086423-A 优先权日:1973-10-12 标题 :Process for cephem synthesis 发明人:FIRESTONE RAYMOND A; RATCLIFFE RONALD W; CHRISTENSEN BURTON G 权利人:MERCK & CO INC 摘要:Cephalosporin antibiotics of the formula: ##STR1## are produced by cycloaddition of a glycine derivative of the formula ##STR2## with a thiazine derivative of the formula ##STR3##