Novel 6.beta.-isocyano penicillin and 7.beta.-isocyano cephalosporin esters of value as intermediates in the synthesis of penicillin and cephalosporin antibiotics are provided. The novel compounds may be prepared by reaction of the corresponding 6.beta.-formamido penicillin ester or 7.beta.-formamido cephalosporin ester with an acid halide derived from phosphorus, sulphur or carbon or from an oxygen acid of one of said elements, suitable halides including thionyl chloride or phosgene, or with a trivalent phosphorus compound such as triphenylphosphine and a halogenated hydrocarbon such as carbon tetrachloride. The conversion of the novel products to 6.beta.- and 7.beta.- (.alpha.-hydroxy) arylacetamido penicillins and cephalosporins respectively by reaction under acidic conditions with an aromatic aldehyde followed by treatment with an aqueous medium is also described.
提供了6.beta.-异
氰酸基
青霉素和7.beta.-异
氰酸基
头孢菌素酯作为合成
青霉素和
头孢菌素类抗生素的中间体。这些新化合物可通过将相应的6.beta.-甲酰胺基
青霉素酯或7.beta.-甲酰胺基
头孢菌素酯与由
磷、
硫或碳或这些元素的氧酸衍生的酸卤化物反应来制备,适当的卤化物包括亚砜
氯化物或
光气,或与
三苯基膦和卤代烃(如
四氯化碳)等三价
磷化合物反应。还描述了通过在酸性条件下与芳香醛反应,然后用
水介质处理,将新产品转化为6.beta.-和7.beta.-(.alpha.-羟基)芳基乙酰胺基
青霉素和
头孢菌素的过程。