Ir(I)/HCl Catalyzed Head-to-Tail Homocoupling Reactions of Vinylsilanes
摘要:
Novel homocoupling reactions of vinylsilanes, catalyzed by a mixture of NI) and HCl, were developed. This process leads to exclusive formation of head-to-tail vinylsilane dimers in high yields at room temperature. Synthetic attributes of transformations of the resulting head-to-tail vinylsilane dimers and polymerization of bis(vinylsilane) were investigated.
o-1-cycloalkenes with titanocene(II)-triethyl phosphite complex, reacted with styrene derivatives to produce (E)-1,4-dienes. Their reaction with vinyl-borane and -silane also produced 1-boryl- and silyl-1,4-dienes, which were transformed into 1-substituted 1,4-dienes through the palladium(0)-catalyzed or copper(I)-promoted reaction with organic halides.
Asymmetric Synthesis of Aminocyclopropanes and<i>N</i>-Cyclopropylamino Alcohols Through Direct Amidocyclopropanation of Alkenes Using Chiral Organozinc Carbenoids
作者:Guillaume Bégis、David E. Cladingboel、Laure Jerome、William B. Motherwell、Tom D. Sheppard
DOI:10.1002/ejoc.200801033
日期:2009.4
Chiral N-(diethoxymethyl)oxazolidinones, prepared from the corresponding oxazolidinones by heating in triethyl orthoformate can he used as organozinccarbenoid precursors for the direct enantioselective amidocyclopropanation of alkenes. The reaction is successful with it wide range of oxazolidinones and alkenes and proceeds with moderate to excellent, yield and stereoselectivity. In most cases the
Observations on the direct amidocyclopropanation of alkenes using organozinc carbenoids
作者:William B. Motherwell、Guillaume Bégis、David E. Cladingboel、Laure Jerome、Tom D. Sheppard
DOI:10.1016/j.tet.2007.03.027
日期:2007.7
A series of amidocyclopropanes were prepared by directamidocyclopropanation of alkenes, usingorganozinccarbenoids generated from readily available diethoxymethylamides. The amidocyclopropanation of monosubstituted alkenes led to selective formation of the trans-amidocyclopropane in most cases, but with more substituted alkenes, the stereochemical outcome of the cyclopropanation reactions was unpredictable
Nickel-Catalyzed C–H Silylation of Arenes with Vinylsilanes: Rapid and Reversible β-Si Elimination
作者:Matthew R. Elsby、Samuel A. Johnson
DOI:10.1021/jacs.7b05574
日期:2017.7.12
inability to catalyze C-H silylation; the reductive elimination step to form the silylation product is much slower than reductive elimination to form the alkene hydroarylation product. Reversible ethylene loss was not observed with 1b, which suggests that the rate-limiting step in the reaction is neither C-H activation nor β-Si elimination but either ethylene loss or reductive elimination of cis-disposed
Cyclic (Alkyl)(amino)carbene Lanthanide Amides: Synthesis, Structure, and Catalytic Selective Hydrosilylation of Alkenes
作者:Zexiong Pan、Jianying Zhang、Lulu Guo、Hao Yang、Jianfeng Li、Chunming Cui
DOI:10.1021/acs.inorgchem.1c01780
日期:2021.9.6
The first examples of cyclic (alkyl)(amino)carbene (CAAC) lanthanide (Ln) complexes were synthesized from the reaction of CAAC with Yb[N(SiMe3)2]2 and Eu[N(SiMe3)2]2(THF)2 (THF = tetrahydrofuran). The structures of (CAAC)Yb[N(SiMe3)2]2 (2) and (CAAC)Eu[N(SiMe3)2]2(THF) (3) were determined by X-ray diffraction analysis. Density functional theory calculations of 2 revealed the predominantly ionic bond