Anion translocation in organolithiums: A mechanism for the lithiation and cyclisation of tertiary naphthamides
作者:Anjum Ahmed、Jonathan Clayden、Michael Rowley
DOI:10.1016/s0040-4039(98)01291-x
日期:1998.8
translocation”) is a key step in the mechanism leading to an α-lithiated tertiary naphthamide and thence to the products of anionic cyclisation. The kinetic isotope effect means that proton transfer from the ortho position can become the sole mechanism for α-lithiation, though for undeuterated amides a parallel mechanism also operates in which lithiation occurs directly at the position α to nitrogen.
氘标记表明,分子内质子转移(“阴离子易位”)是导致α-锂化叔萘酰胺并由此形成阴离子环化产物的关键步骤。动力学同位素效应意味着质子从邻位转移可能成为α-锂化的唯一机制,尽管对于未氘代酰胺,也存在平行机制,其中锂化直接发生在位置α到氮。