Compounds which themselves are antibacterially active and/or which are useful as intermediates for producing antibacterially active materials such as penicillins and cephalosporins are obtained by the following syntheses: Benzyl-2-(2,2-dimethyl-1,3-dioxan-5-ylidene)-2(N-formyl-1)-aminoacetate to benzyl-2,2-dimethylspiro-[1,3-dioxane-5,5'-1',3-thiazoline]-4'-carboxylate to benzyl 2-(2,2-dimethyl-1,3-dioxan-5-ylidene)-2[N-(methylthiomethylene)-amino] acetate to benzyl 2-(trans-3-azido-4-methylthio-2-oxo-1-azetidinyl)-2-(2,2-dimethyl-1,3-diox an-5-ylidene) acetate to benzyl 2(trans-3-benzoylamino-4-methylthio-1-azetidinyl)-2-(2,2-dimethyl-1,3-diox an-5-ylidene) acetate to either (1) benzyl 2-(7-oxo-3-phenyl-4-oxa-2,6-diazabicyclo[3.2.0]hept-2-en-6-yl)-2-(2,2-dime thyl-1.3-dioxan-5-ylidene)acetate or (2) benzyl 2-(trans-3-benzoylamino-4-chloro-1-azetidinyl)-2-(2,2-dimethyl-1,3-dioxan- 5-ylidene) acetate and then to the product benzyl-7-benzoylamino-1-dethia-1-oxa-3-hydroxymethyl-cephem-4-carboxylate.
通过以下合成方法得到本身具有抗菌活性和/或用作合成
青霉素和
头孢菌素等抗菌活性材料的中间体的化合物:Benzyl-2-(2,2-二甲基-1,3-二氧杂环-5-基)-2(N-甲酰基-1)-
氨基
乙酸酯到
苯甲酸-2,2-二甲基螺-[1,3-二氧杂环-5,5'-1',3-
噻唑啉]-4'-
羧酸苯甲酯到
苯甲酸-2-(2,2-二甲基-1,3-二氧杂环-5-基)-2[N-(甲
硫亚甲基)-
氨基]
乙酸苯甲酯到
苯甲酸-2-(顺式-3-
叠氮-4-甲
硫基-2-氧代-1-氮杂
丁烷基)-2-(2,2-二甲基-1,3-二氧杂环-5-基)
乙酸苯甲酯到
苯甲酸-2(顺式-3-苯甲酰
氨基-4-甲
硫基-1-氮杂
丁烷基)-2-(2,2-二甲基-1,3-二氧杂环-5-基)
乙酸苯甲酯,然后转化为产物
苯甲酸-7-苯甲酰
氨基-1-去
硫-1-氧-3-羟甲基-
头孢菌素-4-
羧酸苯甲酯,可以是(1)
苯甲酸-2-(7-氧代-3-苯基-4-氧代-2,6-二
氮杂双环[3.2.0]庚-2-烯-6-基)-2-(2,2-二甲基-1.3-二氧杂环-5-基)
乙酸苯甲酯或(2)
苯甲酸-2-(顺式-3-苯甲酰
氨基-4-
氯-1-氮杂
丁烷基)-2-(2,2-二甲基-1,3-二氧杂环-5-基)
乙酸苯甲酯,然后转化为产物
苯甲酸-7-苯甲酰
氨基-1-去
硫-1-氧-3-羟甲基-
头孢菌素-4-
羧酸苯甲酯。