申请人:Ciba Holding Inc.
公开号:EP1930313A2
公开(公告)日:2008-06-11
A process for the preparation of an 1,1-disubstituted oxirane is disclosed, wherein an organic sulphide is reacted in a polar solvent with an educt containing a leaving group attached to a primary or secondary carbon atom, and/or the sulfonium salt formed in this way is reacted with a ketone in presence of a base and a polar solvent. Oxiranes of the type obtained may be further converted into the corresponding α-hydroxyketone or α-aminoketone, either in one step by subjecting to aerobic oxidation in the presence of a transition metal catalyst, or in two steps by hydrolyzation in the presence of an aqueous acid to the corresponding dialcohol and subsequent selective oxidation. Further described are some novel epoxide intermediates.
The α-hydroxyketones and α-aminoketones thus obtainable are useful inter alia as photoinitiators.
本发明公开了一种 1,1-二取代环氧乙烷的制备方法,其中有机硫化物在极性溶剂中 与含有连接到一级或二级碳原子上的离去基团的萃取物反应,和/或以此方法形成的锍盐 在碱和极性溶剂存在下与酮反应。得到的这类环氧乙烷可以进一步转化为相应的 α-羟基酮或α-氨基酮,可以在过渡金属催化剂存在下一步进行有氧氧化,也可以在水性酸存在下分两步水解为相应的二醇,然后进行选择性氧化。此外,还介绍了一些新型环氧化物中间体。
由此获得的 α-羟基酮和α-氨基酮可用作光引发剂。