Methods of producing carboxylic acid ester derivatives of formulae (I) and (II), which are useful, for instance, as intermediates for producing an anti-hypercholesterolemic agent having an inhibitory effect on HMG-CoA Reductase: ##STR1## wherein R.sup.1 and R.sup.2 are independently a protective group for hydroxyl group, or R.sup.1 and R.sup.2 integrally constitute a protective group for hydroxyl groups; R.sup.3 is an alkyl group, or an aryl group; and R.sup.4 is a substituted aryl group, a substituted heterocyclic group, a substituted vinyl group, or a substituted cycloalkenyl group; and ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are respectively the same as defined in the above formula (I), are disclosed. In addition, intermediates for use in these methods of producing the carboxylic acid ester derivatives are disclosed.
生产具有以下式(I)和(II)的
羧酸酯衍
生物的方法,例如,作为生产对
HMG-CoA还原酶具有抑制作用的抗高
胆固醇药物的中间体:##STR1## 其中R.sup.1和R.sup.2分别是羟基的保护基,或者R.sup.1和R.sup.2整体构成羟基的保护基;R.sup.3是烷基,或芳基;R.sup.4是取代芳基,取代杂环基,取代
乙烯基,或取代环烯基;和##STR2## 其中R.sup.1,R.sup.2,R.sup.3和R.sup.4分别与上述式(I)中定义的相同,被揭示。此外,还揭示了用于这些生产
羧酸酯衍
生物的方法的中间体。