申请人:Sanko Kaihatsu Kagaku Kenkyusho
公开号:EP0508424A2
公开(公告)日:1992-10-14
A method for preparing sulfones represented by the following general formula:
(wherein R' represents a lower alkyl group, an aryl group or an aryl group whose nucleus has substituents; and R'' may be identical to or different from R' and represents a lower alkyl group, an aryl group or an aryl group whose nucleus has substituents) comprises the step of condensing 4-hydroxybiphenyl or sulfonic acid esters of 4-hydroxybiphenyl represented by the following general formula:
(wherein R is the same as R' or R'' defined above) with sulfonyl chlorides represented by the following general formula:
R'SO₂Cl
(wherein R' is the same as that defined above) in the presence of a Lewis acid or a superstrong acid; and a method for preparing sulfones represented by the following general formula:
(wherein R' is the same as that defined above) or alkali salts thereof comprises the step of saponifying the foregoing sulfones in the presence of an acid or alkali. These methods permits the production of sulfones or salts thereof in high yield and high quality through relatively simple operations. Thus, useful sulfones having biphenyl structures can be supplied at a low cost and in an industrial scale.
一种制备由以下通式代表的砜的方法:
(其中R'代表低级烷基、芳基或其核具有取代基的芳基;R''可以与R'相同或不同,并代表低级烷基、芳基或其核具有取代基的芳基)包括以下通式所代表的4-羟基联苯或4-羟基联苯的磺酸酯的缩合步骤:
(其中 R 与上文所定义的 R' 或 R''相同)与下 列通式所代表的磺酰氯缩合:
R'SO₂Cl
(其中 R' 与上文所定义的相同),在路易斯酸或超强酸存在下;以及制备由下式通式表示的砜的方法:
(其中 R'与上述定义相同)或其碱盐的方法包括在酸或碱存在下对上述砜进行皂化的步骤。通过这些方法,可以通过相对简单的操作,生产出产量高、质量好的砜类或其盐类。因此,具有联苯结构的有用砜可以以低成本和工业规模供应。