A rare Ta bis(imido) complex, which has unique reactivity, was prepared by manipulating the coordination sphere of a CCC-NHC pincer Ta complex. The reaction of lithium tert-butylamide with complex 1 yielded (1,3-bis(3'-butylimidazol-2'-yl-1'-idene)-2-phenylene)bis(tert-butylimido)tantalum(V) (2) as a lithium iodide bridged dimer, as determined by the X-ray structure. Complex 2 catalytically cyclized alpha,omega-aminoalkenes to effect an oxidative amination of alkenes (dehydrogenation by C-H activation) and produced a cyclic imine, an equivalent of reduced substrate, and varying proportions of hydroamination. Various additives and concentration impact the catalytic results. Computational and experimental observations have led to an initial mechanistic hypothesis. Based upon it, precatalyst 2 appears to be the first example of a bifunctional catalyst (MH-NHR) that is highly selective for nonpolar C-C bonds in preference to polar C-X bonds for outer-sphere hydrogenation.
Compounds, pharmaceutical compositions, and methods of use are disclosed for heteroaryl amide analogues of formula Ia and/or Ib: . In certain embodiments, the heteroaryl amide analogues are agonists and/or ligands of dopamine receptors and may be useful, inter alia, for the treatment of a condition responsive to P2X7 receptor modulation, for example, pain, inflammation, a neurological or neurodegenerative disorder, a cardiovascular disorder, an ocular disorder or an immune system disorder.
Intramolecular Hydroamination of Unbiased and Functionalized Primary Aminoalkenes Catalyzed by a Rhodium Aminophosphine Complex
作者:Lisa D. Julian、John F. Hartwig
DOI:10.1021/ja1052126
日期:2010.10.6
We report a rhodium catalyst that exhibits high reactivity for the hydroamination of primary aminoalkenes that are unbiased toward cyclization and that possess functional groups incompatible with more electrophilic hydroaminationcatalysts. The rhodium catalyst contains an unusual diaminophosphine ligand (L1) that binds to rhodium in a κ(3)-P,O,P mode. The reactions catalyzed by this complex typically
我们报告了一种铑催化剂,它对伯氨基烯烃的加氢胺化表现出高反应性,这些烯烃不偏向环化,并且具有与更多亲电加氢胺化催化剂不相容的官能团。铑催化剂含有一种不寻常的二氨基膦配体 (L1),它以 κ(3)-P,O,P 模式与铑结合。由该配合物催化的反应通常在温和的温度(室温至 70°C)下进行,并且发生在烷基链上缺少取代基的伯氨基烯烃,使系统倾向于环化,伯氨基烯烃含有氯化物、酯、醚、可烯醇化的酮、腈和未保护的醇官能团,以及含有内烯烃的伯氨基烯烃。机理数据表明,这些反应发生的转换限制步骤不同于由 Pd、Pt 和 Ir 的后过渡金属配合物催化的反应。转化限制步骤的这种变化以及由此产生的催化剂的高活性源于 MC 键的质子分解以释放加氢胺化产物与氨基烷基中间体的回复以再生无环前体的有利相对速率。L1 的铑配合物的反应性起源的探针意味着氨基膦基团通过超出空间需求和简单的电子向金属中心的作用导致这些有利的速率。
[EN] METHOD FOR PRODUCING AN OPTICALLY ACTIVE NITRO COMPOUND<br/>[FR] PROCEDE DE PRODUCTION D'UN COMPOSE NITRO OPTIQUEMENT ACTIF
申请人:CARREIRA ERICK M
公开号:WO2004103951A1
公开(公告)日:2004-12-02
An optically active nitro compound having two hydrogen atoms on its α-cabon atom and having β-asymmetric carbon atom can be produced by making α, β-unsaturated nitroolefin having a hydrogen atom on its α-cabon atom react with at least two organosilicon compounds having at lest one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex, or react with an organosilicon compound having at least one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex and water.
Method for producing an optically active nitro compound
申请人:Carreira M. Erick
公开号:US20070037976A1
公开(公告)日:2007-02-15
An optically active nitro compound having two hydrogen atoms on its α-cabon atom and having β-asymmetric carbon atom can be produced by making α, β-unsaturated nitroolefin having a hydrogen atom on its α-cabon atom react with at least two organosilicon compounds having at lest one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex, or react with an organosilicon compound having at least one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex and water.
Compounds, pharmaceutical compositions, and methods of use are disclosed for heteroaryl amide analogues of formula Ia and/or Ib:
In certain embodiments, the heteroaryl amide analogues are agonists and/or ligands of dopamine receptors and may be useful, inter alia, for the treatment of a condition responsive to P2X
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receptor modulation, for example, pain, inflammation, a neurological or neurodegenerative disorder, a cardiovascular disorder, an ocular disorder or an immune system disorder.