The Zn(OTf)2-SDS-bipyridine 1 system has proved to be an effective catalyst in water for the desymmetrization of epoxides 2a-d by anilines 3a-d. After obtaining comparable results by using Sc(III)-SDS and Zn(II)-SDS systems in the case of 2a and 3a, we have explored the enantioselective ring opening of small epoxides for which water has never been used as reaction medium. Up to date the 85% ee obtained in the case of cyclohexene oxide 2b with amines 3a and 3d are very good results and are the highest values obtained in water as reaction medium.
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锌络合物Zn(OTf)2-
十二烷基硫酸钠-联
吡啶1体系已证明是在
水中有助于
环氧化物2a至2d的不对称去对称化的有效催化剂,通过
苯胺3a至3d实现。在使用Sc(III)-
SDS和Zn(II)-
SDS体系对2a和3a进行反应后,我们获得了可比较的结果,进而我们探索了在以往未曾使用
水作为反应介质的小
环氧化物的手性选择性开环反应。迄今为止,在对
环己烯氧化物2b与胺3a和3d的反应中,我们获得了85%的ee值,这一结果非常出色,并且是在
水相反应介质中获得的最高值。`