已经开发了一种由酸碱输入控制的分子配位开关,并将其用于可转换催化中。分子开关由结合到Ir III Cp *部分上的吡啶基-苯并咪唑杂配体组成,其中苯并咪唑官能团已用于酸/碱控制的可逆配位,在Ir III-苯并咪唑类物质之间切换(形式I;中性亚氨基型N-配位)和Ir III-苯并咪唑酸酯类(II型;阴离子氨基型N-Ir键)。由于金属-配体键的性质截然不同,已证明I型几乎没有活性(TOF 1 h –1)在环境压力和温度下对亚胺进行催化加氢时,在相同的催化作用下,形式II的效率要高一个数量级(TOF 15.8 h –1)。此外,在分别添加酸和碱的情况下,催化可以在几个循环中有效地关闭和打开。已经进行了光谱研究和动力学以了解开关活性。
Reductive Monoalkylation of Aromatic and Aliphatic Nitro Compounds and the Corresponding Amines with Nitriles
作者:Ruel Nacario、Shailaja Kotakonda、David M. D. Fouchard、L. M. Viranga Tillekeratne、Richard A. Hudson
DOI:10.1021/ol047580f
日期:2005.2.1
[reaction: see text] A simple, selective, rapid, and efficient procedure for the synthesis of secondary amines from the reductive alkylation of either aliphatic or aromatic nitro compounds and the corresponding amines is reported. Ammoniumformate is used as the hydrogen source and Pd/C as the hydrogen transfer catalyst. The reaction is carried out at room temperature. The rate differences for the preferential
Synthesis of secondary amines by reductive amination of aldehydes with nitroarenes over supported copper catalysts in a flow reactor
作者:Alexey L. Nuzhdin、Ekaterina A. Artiukha、Galina A. Bukhtiyarova、Elizaveta A. Derevyannikova、Valerii I. Bukhtiyarov
DOI:10.1016/j.catcom.2017.09.001
日期:2017.12
Supported copper catalysts were investigated for the one-pot reductiveamination of aldehydes with nitroarenes in a continuous flow reactor. This process is considered advantageous compared to current traditional methods, which present several drawbacks, such as toxicity of reducing or alkylation agent, lack of monoalkylation selectivity and large amounts of waste produced. Various secondary amines
Hydrazine der Formel
worin
R einen Aryl- oder Aralkylrest und
R einen Alkyl-, Aryl- oder Aralkylrest bedeuten, oder wenn R für einen Arylrest steht,
R1 auch für einen Alkylen- oder Cycloalkylenrest stehen kann, der mit R in der ortho-Stellung zum Stickstoff verbunden ist, werden hergestellt, indem man sekundäre Amine der Formel
zu Nitrosaminen umsetzt und diese ohne Isolierung bei 0 bis 50° C und bei pH-Werten von 5 bis 6 mit Zinkstaub in Gegenwart von Salzsäure oder Schwefelsäure reduziert und die Reduktion bei pH-Werten von unter 4 zu Ende führt.
式中 R 为芳基或芳烷基,R 为烷基、芳基或芳烷基,或者如果 R 为芳基,R1 也可以是亚烷基或环亚烷基,该亚烷基或环亚烷基在氮的正交位置上与 R 连接,制备方法是将式中的仲胺与亚硝胺反应,然后在 0 至 50℃、pH 值为 5 至 6 的条件下,在盐酸或硫酸存在下用锌粉不经分离地还原这些亚硝胺,并在 pH 值低于 4 的条件下完成还原。
OXALIC ACID MONOAMIDE LIGAND, AND USES THEREOF IN COUPLING REACTION OF COPPER-CATALYZED ARYL HALOGEN SUBSTITUTE
申请人:Shanghai Institute of Organic Chemistry, Chinese
Academy of Sciences
公开号:EP3326715A1
公开(公告)日:2018-05-30
The present invention provides oxalic amide ligands and uses thereof in copper-catalyzed coupling reaction of aryl halides. Specifically, the present invention provides a use of a compound represented by formula I, wherein definitions of each group are described in the specification. The compound represented by formula I can be used as a ligand in copper-catalyzed coupling reaction of aryl halides for the formation of C-N, C-O and C-S bonds.
本发明提供了草酸酰胺配体及其在铜催化的芳基卤化物偶联反应中的用途。具体而言,本发明提供了一种由式 I 代表的化合物的用途,其中各基团的定义在说明书中有所描述。式 I 所代表的化合物可用作铜催化的芳基卤化物偶联反应中的配体,用于形成 C-N、C-O 和 C-S 键。
Highly active and regioselective hydroaminomethylation of olefins catalyzed by Rh/sulfoxantphos with ZSM-5
Rh/sulfoxantphos-catalyzed hydroaminomethylation has been developed to afford corresponding linear amines with good yields (71–95%) with high regioselectivities (l/b up to 132.4) and excellent catalytic activities (TON of Rh catalyst up to 23 760).