The Lithiation Reactivity and Selectivity of Differentially Branched Alkyldiphenylphosphine Oxides - A Simple and Versatile Approach to<i>ortho-</i>Functionalized Arylphosphine Oxides
作者:Shraddha G. Mahamulkar、Ivana Císařová、Ullrich Jahn
DOI:10.1002/adsc.201400861
日期:2015.3.9
alkyllithium reagents. Here, the lithiation of differentially branched alkyldiphenylphosphine oxides was investigated and a diverse, but predictable reactivity was found. γ‐Branched derivatives undergo selective directed ortho‐metalation (DoM) using butyllithium and TMEDA as an additive. With decreasing degree of γ‐branching α‐lithiation becomes predominant. The ortho‐phosphinoyllithium intermediates
烷基二苯基膦氧化物通常用烷基锂试剂进行α-去质子化。在此,对差异支化的烷基二苯基膦氧化物的锂化进行了研究,发现了多种多样但可预测的反应性。γ-支链衍生物离岗选择性定向邻-metalation使用(DOM)丁基锂和TMEDA作为添加剂。随着γ支化度的降低,α锂化变得占主导地位。的邻-phosphinoyllithium中间体受官能化和C C键形成反应,从而提供了一种方便的方法,以新的氧化膦和膦-硼烷复合物,其具有用于一种方法来用于催化新配体的潜力。