Seeking Heteroatom-Rich Compounds: Synthetic and Mechanistic Studies into Iron Catalyzed Dehydrocoupling of Silanes
作者:Danila Gasperini、Andrew K. King、Nathan T. Coles、Mary F. Mahon、Ruth L. Webster
DOI:10.1021/acscatal.0c01440
日期:2020.6.5
aminosilane synthesis along with kinetic studies using MeBnNH and MePhSiH2 as coupling partners. The kinetic studies suggest a reversible reaction with silane which generates aminosilane and an Fe-hydride dimer that undergoes rate-limiting protonolysis with amine with N–H bond cleavage in the transition state, consistent with a primary KIE of 2.42(3). The presence of dimers as on-cycle intermediates was analyzed
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
Catalytic dehydrogenative Si–N coupling of pyrroles, indoles, carbazoles as well as anilines with hydrosilanes without added base
作者:C. David F. Königs、Maria F. Müller、Nuria Aiguabella、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1039/c3cc38900f
日期:——
A base-free, catalytic protocol for the dehydrogenative Si-N coupling of weakly nucleophilic N-H groups of heteroarenes or aryl-substituted amines with equimolar amounts of hydrosilanes is reported. Cooperative Si-H bond activation at a Ru-S bond generates a silicon electrophile that forms a Si-N bond prior to the N-H deprotonation by an intermediate Ru-H complex, only releasing H(2).
Hydroxyapatite‐supportedgoldnanoparticles (Au/HAP) can act as a highly active and reusable catalyst for the coupling of hydrosilanes with amines under mild conditions. Various silylamines can be selectively obtained from diverse combinations of equimolar amounts of hydrosilanes with amines including less reactive bulky hydrosilanes. This study also highlights the applicability of Au/HAP to the selective
Si–N Heterodehydrocoupling with a Lanthanide Compound
作者:Michael P. Cibuzar、Rory Waterman
DOI:10.1021/acs.organomet.8b00372
日期:2018.12.10
[LaN(SiMe3)2}3THF2] (1) is an effective precatalyst for the heterodehydrocoupling of silanes and amines. Coupling of primary and secondary amines with aryl silanes was achieved with a loading of 0.8 mol % of [LaN(SiMe3)2}3THF2]. With primary amines, generation of tertiary and sometimes quaternary silamines was facile, often requiring only a few hours to reach completion, including new silamines Ph3Si(nPrNH)