Alkaline-Earth-Catalysed Cross-Dehydrocoupling of Amines and Hydrosilanes: Reactivity Trends, Scope and Mechanism
作者:Clément Bellini、Vincent Dorcet、Jean-François Carpentier、Sven Tobisch、Yann Sarazin
DOI:10.1002/chem.201504316
日期:2016.3.18
Alkaline‐earth (Ae=Ca, Sr, Ba) complexes are shown to catalyse the chemoselective cross‐dehydrocoupling (CDC) of amines and hydrosilanes. Key trends were delineated in the benchmark couplings of Ph3SiH with pyrrolidine or tBuNH2. AeE(SiMe3)2}2⋅(THF)x (E=N, CH; x=2–3) are more efficient than N^N}AeE(SiMe3)2}⋅(THF)n (E=N, CH; n=1–2) complexes (where N^N}−=ArN(o‐C6H4)C(H)=NAr}− with Ar=2,6‐iPr2‐C6H3)
碱土(Ae = Ca,Sr,Ba)配合物可催化胺和氢硅烷的化学选择性交叉脱氢偶联(CDC)。在Ph 3 SiH与吡咯烷或t BuNH 2的基准偶联中描述了关键趋势。阂E(森达3)2 } 2 ⋅(THF)X(E = N,CH; X = 2〜3)比更有效N ^ N} 阂E(森达3)2 } ⋅(THF)n(E = N,CH; n = 1–2)个络合物(其中N ^ N} - = ArN(o -C 6 H 4)C(H)= NAr}− Ar = 2,6 - i Pr 2– C 6 H 3)带有亚氨基苯胺配体,烷基预催化剂比酰胺类似物更好。周转频率(TOF)以Ca 30种产品)包括二胺和二(氢硅烷)。对吡咯烷和Ph 3 SiH的Ba促进的CDC的动力学分析表明:1)动力学规律为速率= k [Ba] 1 [胺] 0 [氢硅烷] 1,2)芳基氢硅烷上的吸电子p取代基可提高反应速率,并且3)对于Ph