A process for producing a compound represented by general formula (II) by the reaction of an epoxy compound represented by general formula (I) with an alcohol under a basic condition, wherein R₁ represents hydrogen or a protective group; R₂ represents hydrogen or hydroxy; R₃, R₄, R₅ and R₆ represent such groups that a pair of R₃ and R₄ and a pair of R₅ and R₆ form each a double bond, or a pair of R₄ and R₅ forms a double bond while R₃ and R₆ are bonded to a dienophile capable of protecting conjugated double bonds; and R₇ represents lower alkyl, cycloalkyl or optionally protected lower hydroxyalkyl. This process is one for synthesizing an intermediate of a vitamin D derivative in an imptroved yield without the necessity for complicated procedure of protection and is also suited for mass production.
                            一种通过通式(I)代表的环氧化合物与醇在碱性条件下反应制得通式(II)代表的化合物的工艺,其中R₁代表氢或保护基;R₂代表氢或羟基;R₃、R₄、R₅ 和 R₆ 代表这样的基团,即一对 R₃ 和 R₄ 以及一对 R₅ 和 R₆ 各自形成一个双键、或一对 R₄ 和 R₅ 形成双键,而 R₃ 和 R₆ 与能够保护共轭双键的亲二烯键结合;和 R₇ 代表低级烷基、环烷基或可选保护的低级羟基烷基。这种工艺可以合成
维生素 D 衍
生物的中间体,产量高,无需复杂的保护程序,也适合大规模生产。