Application of Diazaphospholidine/Diazaphospholene-Based Bisphosphines in Room-Temperature Nickel-Catalyzed C(sp<sup>2</sup>)–N Cross-Couplings of Primary Alkylamines with (Hetero)aryl Chlorides and Bromides
作者:Alexandre V. Gatien、Christopher M. Lavoie、Raymond N. Bennett、Michael J. Ferguson、Robert McDonald、Erin R. Johnson、Alexander W. H. Speed、Mark Stradiotto
DOI:10.1021/acscatal.8b01005
日期:2018.6.1
donor fragment paired with an adjacent PR2 donor group (R = alkyl, aryl), whereby the incorporation of phosphorus into either a saturated or unsaturated heterocyclic ring serves as a means of modulating the donicity of the NHP fragment. Screening of these ancillary ligands in representative nickel-catalyzed C(sp2)–N cross-coupling test reactions allowed for the identification of one variant, featuring
我们在本文中报道了邻苯撑桥联双膦辅助配体家族的合成和催化应用,该配体具有庞大的N-杂环膦(NHP)供体片段与相邻的PR 2供体基团(R =烷基,芳基)配对,从而将磷结合到饱和或不饱和杂环中可作为调节NHP片段电荷的手段。在代表性镍催化的C(sp 2中筛选这些辅助配体)–N交叉偶联测试反应可鉴定一种具有饱和NHP结构和相邻的二苯基膦基供体基团(即NHP-DalPhos)的变体,在涉及伯烷基胺的反应中特别有效。值得注意的是,在室温下应用衍生的预催化剂(NHP-DalPhos)NiCl(邻甲苯基)(C1)可以使结构多样的伯烷基胺与(杂)芳基氯化物或溴化物进行典型的挑战性单芳基化。还描述了我们采用PAd-DalPhos或NHP-DalPhos对镍催化的伯烷基胺C(sp 2)-N交叉偶联进行比较密度泛函理论计算分析的结果。