Generation of oxiranyllithiums and oxiranyl Grignard reagents having a carbanion-destabilizing group from sulfinyloxiranes: Their property and an application to asymmetric synthesis of epoxides and alcohols
作者:Tsuyoshi Satoh、Shigeko Kobayashi、Shino Nakanishi、Kyoko Horiguchi、Shiro Irisa
DOI:10.1016/s0040-4020(99)00038-1
日期:1999.2
The first generation of oxiranyllithiums and oxiranyl Grignard reagents having a carbanion-destabilizing group (alkyl group) was realized from sulfinyloxiranes via the ligand exchange reaction of sulfoxides with tert-butyllithium or ethylmagnesium chloride in THF at −80 to −100°C. The generated oxiranyllithiums were found to be very unstable; however, these anions reacted with several electrophiles
通过亚砜与叔丁基锂或乙基氯化镁在THF中于-80至-100°C下进行的亚砜配位体交换反应,由亚磺酰基氧杂环戊烷实现了具有碳负离子稳定基团(烷基)的第一代环氧乙烷基锂和环氧乙烷基格氏试剂。发现生成的环氧乙烷基锂非常不稳定。然而,这些阴离子与几种亲电试剂反应生成环氧化物,收率高达86%。发现环氧乙烷基格氏试剂比环氧乙烷基锂更稳定且反应性更差。研究了具有几个烷基的环氧乙烷基锂的反应性。作为该方法的应用,由光学活性的氯甲基对苯二酚合成了光学活性的三和四取代的环氧化物和醇-经由甲苯氧基锂的甲苯基亚砜。