Studies on the Stability of Cycloprop-2-ene Carboxylate Dianions and Reactions with Electrophiles
作者:Laural A. Fisher、Joseph M. Fox
DOI:10.1021/jo801683n
日期:2008.11.7
the generation, stability, and reactivity of cycloprop-2-ene carboxylate dianions. It has been found that certain additives can have a substantial effect on the chemistry of cycloprop-2-ene carboxylate dianions. In particular, it was determined that amine N-oxide additives have a beneficial effect both on the stability of cycloprop-2-ene carboxylate dianions and on the rates that such dianions undergo
从烷基锂试剂和环丙-2-烯羧酸生成二价阴离子,并且这些二价阴离子可以在乙烯基位置被亲电试剂官能化。在以前的报告中,我们描述了这种二价阴离子可能在Et2O或THF中生成并与亲电试剂反应。经过进一步研究,发现在Et2O中进行的那些反应存在重现性问题。在假设杂质可能促进这些反应的前提下进行了详细的研究,以确定变量对环丙-2-烯羧酸二阴离子的产生,稳定性和反应性的影响。已经发现某些添加剂可以对环丙-2-烯羧酸根二价阴离子的化学性质产生实质性影响。特别是,已经确定,胺N-氧化物添加剂对环丙-2-烯羧酸酯二价阴离子的稳定性和该二价阴离子进行烷基化的速率均具有有益的作用。描述了使二价阴离子与各种各样的亲电试剂反应的条件。