The subject invention relates to a method of synthesizing nitroxides from secondary amines. This method uses a suitable dioxirane compound such as dimethyldioxirane (DMD), which is relatively stable and simple to synthesize, as the oxidizing agent. A quantity of a secondary amine having no hydrogen atoms directly attached to the alpha carbon atoms is mixed with a 2x molar ratio of the dioxirane. In a first reaction, the secondary amine is oxidized to form a hydroxylamine; in a second reaction, the hydroxylamine is further oxidized to form a nitroxide. When the dioxirane loses an oxygen atom it converts into a ketone; for example, dimethyldioxirane is converted into acetone. This is very convenient, since the ketone byproduct is a solvent that can be easily removed after the reaction without causing interfering reactions. This method provides a simple, highly selective, rapid reaction with very high yields. It can be carried out in a single reaction vessel and can be used with a wide variety of secondary amines (including secondary amines having more than one amine group) to create a corresponding variety of nitroxides.
该专利涉及一种从二级胺合成亚硝基的方法。该方法使用适当的二氧
环丙烷化合物,如二甲基二氧
环丙烷(
DMD),作为氧化剂,这种化合物相对稳定且易于合成。将一定量的二级胺与二氧
环丙烷的2倍摩尔比混合。在第一反应中,二级胺被氧化形成
羟胺;在第二反应中,
羟胺进一步被氧化形成亚硝基。当二氧
环丙烷失去一个氧原子时,它会转化为酮;例如,二甲基二氧
环丙烷转化为
丙酮。这非常方便,因为酮副产物是一种溶剂,在反应后可以很容易地去除而不引起干扰反应。该方法提供了一个简单、高度选择性、快速反应且产率非常高的方法。它可以在单个反应容器中进行,并可与各种二级胺(包括具有多个胺基的二级胺)一起使用,以创建相应多样的亚硝基。