Transnitrilation from Dimethylmalononitrile to Aryl Grignard and Lithium Reagents: A Practical Method for Aryl Nitrile Synthesis
作者:Jonathan T. Reeves、Christian A. Malapit、Frederic G. Buono、Kanwar P. Sidhu、Maurice A. Marsini、C. Avery Sader、Keith R. Fandrick、Carl A. Busacca、Chris H. Senanayake
DOI:10.1021/jacs.5b06136
日期:2015.7.29
An electrophilic cyanation of aryl Grignard or lithium reagents, generated in situ from the corresponding aryl bromides or iodides, by a transnitrilation with dimethylmalononitrile (DMMN) was developed. DMMN is a commercially available, bench-stable solid. The transnitrilation with DMMN avoids the use of toxic reagents and transition metals and occurs under mild reaction conditions, even for extremely
开发了芳基格氏试剂或锂试剂的亲电氰化,由相应的芳基溴化物或碘化物原位生成,通过与二甲基丙二腈 (DMMN) 进行腈基转移。DMMN 是市售的、工作台稳定的固体。使用 DMMN 进行的腈基转移避免了使用有毒试剂和过渡金属,并且在温和的反应条件下发生,即使对于空间位阻非常大的底物也是如此。由定向邻位锂化产生的芳基锂物质的腈基转腈作用使净 CH 氰化成为可能。Thorpe 型亚胺加合物在反应中的中介作用是通过从淬灭反应中分离相应的酮来支持的。计算研究支持亚胺加合物逆向索普碎裂的能量有利性。