Unexpected behaviour of tosylated and acetylated imidazolinium salts
作者:Nicole Clemens、Oksana Sereda、Ren? Wilhelm
DOI:10.1039/b601104g
日期:——
Tosylated and acetylated imidazolinium salts revealed an unexpected reactivity when treated with methyl iodide or benzyl bromide. Moreover an unprecedented acid-catalysed rearrangement for an acetylated imidazolinium salt was observed during an anion metathesis.
An efficient method for the preparation of N,N-disubstituted 1,2-diamines
作者:Judith M Mitchell、Nathaniel S Finney
DOI:10.1016/s0040-4039(00)01501-x
日期:2000.10
2-diamines are useful precursors to numerous reagents used in asymmetric synthesis and catalysis. We report here an efficient protocol for converting the two most commonly used trans-1,2-diamines to N,N-disubstituted derivatives, a transformation that simplifies the preparation of non-C2-symmetric diamines. Central to the method is the high-yieldingconversion of the diamines to the corresponding monoacetylated
C 2-对称的1,2-二胺是不对称合成和催化中使用的许多试剂的有用前体。我们在这里报告了将两种最常用的反式-1,2-二胺转化为N,N-二取代衍生物的有效方案,该转化简化了非C 2-对称二胺的制备。该方法的核心是通过咪唑啉中间体将二胺高产率转化为相应的单乙酰化衍生物。