A process for preparing an enol silyl ether compound from a diazoacetoacetic acid ester having the general formula (IV): ##STR1## wherein R.sup.1 is a lower alkyl group having 1 to 6 carbon atoms, phenyl group, a substituted phenyl group, an aralkyl group or allyl group, and R.sup.2, R.sup.3 and R.sup.4 are the same or mutually different and each is a lower alkyl group having 1 to 6 carbon atoms, which comprises reacting a diazoacetoacetic acid ester having the general formula (I): ##STR2## wherein R.sup.1 is the same as defined above, with a trialkylsilyl chloride having the general formula (II): ##STR3## wherein R.sup.2, R.sup.3 and R.sup.4 are the same as defined above, in an inert solvent in the presence of an organic base and an alkali halide having the general formula (III): MX (III) wherein M is an alkaline metal and X is bromine atom or iodine atom. The desired compound is useful as an intermediate for synthesis of carbapenem .beta.-lactam antibiotics.
一种从具有通式(IV)的重氮
乙酰乙酸酯制备烯醇
硅醚化合物的方法:##STR1## 其中R.sup.1是具有1到6个碳原子的低碳基团,苯基,取代苯基,芳基烷基或烯丙基,R.sup.2,R.sup.3和R.sup.4相同或互不相同,且每个都是具有1到6个碳原子的低碳基团,包括在有机碱和具有通式(III)的碱
金属卤化物的存在下,在惰性溶剂中将具有通式(I)的重氮
乙酰乙酸酯:##STR2## 其中R.sup.1如上定义,与具有通式(II)的三烷基
硅氯化物反应:##STR3## 其中R.sup.2,R.sup.3和R.sup.4如上定义,所得化合物可用作合成碳青霉烯类β-内酰胺类抗生素的中间体。