In this manuscript, the synthesis of a series of cationic Ni^II complexes based on mixed donor triazolyl-pyridine-based aminophosphine, [(NiCl){^R′P^RNN}-κ³-P,N,N]OTf (R = H or Me; R′ = Ph or ^tBu), is described. The neutral dearomatized complexes [(NiCl){^R′PNN}-κ³-P,N,N] (R′ = Ph or ^tBu) were prepared by deprotonation of [(NiCl){P^PhN(H)N}-κ³-P,N,N]OTf (Ni1) and [(NiCl){(^tBu₂P)N(H)N}-κ³-P,N,N]OTf (Ni3) with 1 equiv. of ^tBuOK. These complexes (0.5 mol%) were employed for the synthesis of substituted quinolines at 110 °C under microwave irradiation with 20 mol% of KOH. Among these, complexes [(NiCl){^tBuP^HNN-κ³-P,N,N}]OTf (Ni3) and [(NiCl){^tBuPNN}-κ³-P,N,N] (Ni5) were found to be highly efficient. A wide range of derivatives, including aryl, aliphatic, acyclic ketones, primary alcohols and aminobenzyl alcohols, yielded the corresponding quinolines in good to excellent yields (62 examples). A series of control experiments were carried out to establish the reaction mechanism. HR-MS spectral studies were investigated to characterize the nickel-hydride intermediate. Mechanistic studies confirmed that the reaction takes an acceptorless dehydrogenative coupling pathway.

中文翻译：

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微波辐射下镍-PNN催化多取代喹啉的可持续合成


在这篇手稿中，基于混合供体三唑基-吡啶基氨基膦合成了一系列阳离子 Ni ^II配合物，[(NiCl){ ^R′ P ^R NN}-κ ³ -P,N,N]OTf (R =描述了H或Me；R'=Ph或^tBu )。通过 [(NiCl){P ^Ph N(H)N} 去质子化制备中性脱芳构化配合物 [(NiCl){ ^R' PNN}-κ ³ -P,N,N] (R' = Ph 或^t Bu) -κ ³ -P,N,N]OTf ( Ni1 ) 和 [(NiCl){( ^t Bu ₂ P)N(H)N}-κ ³ -P,N,N]OTf ( Ni3 ) 具有 1 当量。 ^t BuOK。这些配合物 (0.5 mol%) 用于在 110 °C 微波辐射下用 20 mol% KOH 合成取代喹啉。其中，配合物 [(NiCl){ ^{t Bu} P ^H NN-κ ³ -P,N,N}]OTf ( Ni3 ) 和 [(NiCl){ ^{t Bu} PNN}-κ ³ -P,N,N] ( Ni5 )被发现非常高效。 多种衍生物，包括芳基、脂肪族、无环酮、伯醇和氨基苄醇，以良好到优异的产率产生相应的喹啉（62个实例）。进行了一系列控制实验来建立反应机理。研究 HR-MS 光谱研究来表征氢化镍中间体。机理研究证实该反应采用无受体脱氢偶联途径。