Magnetic MCM-41 nanoparticles as a support for the immobilization of a palladium organometallic catalyst and its application in C–C coupling reactions
作者:Bahman Tahmasbi、Arash Ghorbani-Choghamarani
DOI:10.1039/c9nj02727k
日期:——
In this study, the surface of magnetic MCM-41 nanoparticles (MCM-41/Fe3O4) was modified by 3-aminopropyltriethoxysilane (APTES) and further, 1-methyl imidazole was anchored on their surface using cyanuric chloride as a linker. Then, Pd2+ ions were immobilized on the surface of the modified MCM-41/Fe3O4 (Pd-imi-CC@MCM-41/Fe3O4), and its application was studied as a magnetically recyclable nanocatalyst
在这项研究中,磁性MCM-41纳米颗粒(MCM-41 / Fe 3 O 4)的表面被3-氨丙基三乙氧基硅烷(APTES)改性,然后使用氰尿酰氯作为连接剂将1-甲基咪唑固定在其表面上。然后,将Pd 2+离子固定在改性MCM-41 / Fe 3 O 4(Pd-imi-CC @ MCM-41 / Fe 3 O 4)的表面上。),并研究了其作为可磁循环利用的纳米催化剂在广泛的芳基卤化物与丙烯酸丁酯,丙烯酸甲酯,丙烯腈,苯基硼酸或3,4-二氟苯基硼酸之间的碳-碳偶联反应中的条件-无配体和空气气氛。该催化剂具有Fe 3 O 4纳米颗粒和中孔MCM-41的优点。通过TEM,SEM,EDS,WDX,N 2吸附-脱附等温线,XRD,TGA,FT-IR和AAS对催化剂的结构进行了表征。同样,回收的催化剂通过SEM,AAS和FT-IR。从碳-碳偶合反应获得的所有产物均具有优异的收率和较高的TON和TOF值,这表
作者:Brian M. Fox、Reina Natero、Kevin Richard、Richard Connors、Philip M. Roveto、Holger Beckmann、Katrin Haller、Justin Golde、Shou-Hua Xiao、Frank Kayser
DOI:10.1016/j.bmcl.2011.02.046
日期:2011.4
We discovered novel pyrrolidine MCHR1antagonist 1 possessing moderate potency. Profiling of pyrrolidine 1 demonstrated that it was an inhibitor of the hERG channel. Investigation of the structure–activity relationship of this class of pyrrolidines allowed us to optimize the MCHR1 potency and decrease the hERG inhibition. Increasing the acidity of the amide proton by converting the benzamide in lead
Cu-catalyzed cyanomethylation of imines and α,β-alkenes with acetonitrile and its derivatives
作者:Muhammad Siddique Ahmad、Atique Ahmad
DOI:10.1039/d0ra10693c
日期:——
We describe copper-catalyzed cyanomethylation of imines and α,β-alkenes with a methylnitrile source and provide an efficient route to synthesize arylacrylonitriles and β,γ-unsaturated nitriles. This method tolerates aliphatic and aromatic alkenes substituted with a variety of functional groups such as F, Cl, Br, Me, OMe, tert-Bu, NO2, NH2 and CO2H with good to excellent yields (69–98%). These systems
Manganese(I)-Catalyzed H–P Bond Activation via Metal–Ligand Cooperation
作者:Juana M. Pérez、Roxana Postolache、Marta Castiñeira Reis、Esther G. Sinnema、Denisa Vargová、Folkert de Vries、Edwin Otten、Luo Ge、Syuzanna R. Harutyunyan
DOI:10.1021/jacs.1c10756
日期:2021.12.8
Mn(I) complexes are capable of H–P bond activation. This activation mode enables a general method for the hydrophosphination of internal and terminal α,β-unsaturatednitriles. Metal−ligand cooperation, a strategy previously not considered for catalytic H–P bond activation, is at the base of the mechanistic action of the Mn(I)-based catalyst. Our computational studies support a stepwise mechanism for the
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-Selective C−H Borylation of Benzylamine-, Phenethylamine-, and Phenylpropylamine-Derived Amides Enabled by a Single Anionic Ligand
作者:Holly J. Davis、Georgi R. Genov、Robert J. Phipps
DOI:10.1002/anie.201708967
日期:2017.10.16
Clever positioning: A bipyridine ligand incorporating a remote anionic sulfonate group directs iridium-catalyzed borylation to the meta-position on a range of amide-containing arenes. It is proposed that this selectivity is a result of a hydrogen bonding interaction to correctly position the iridium metal centre in the crucial C−H activation.