- Visible-Light-Mediated Oxidative Amidation of Aldehydes by Using Magnetic CdS Quantum Dots as a Photocatalyst
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A magnetic CdS quantum dot (Fe3O4/polydopamine (PDA)/CdS) was synthesized through a facile and convenient method from inexpensive starting materials. Characterization of the prepared catalyst was performed by means of FTIR spectrosco
- Xu, Ling,Zhang, Shuai-Zheng,Li, Wei,Zhang, Zhan-Hui
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p. 5483 - 5491
(2021/03/01)
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- Amide Bond Formation via Aerobic Photooxidative Coupling of Aldehydes with Amines Catalyzed by a Riboflavin Derivative
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We report an effective, operationally simple, and environmentally friendly system for the synthesis of tertiary amides by the oxidative coupling of aromatic or aliphatic aldehydes with amines mediated by riboflavin tetraacetate (RFTA), an inexpensive organic photocatalyst, and visible light using oxygen as the sole oxidant. The method is based on the oxidative power of an excited flavin catalyst and the relatively low oxidation potential of the hemiaminal formed by amine to aldehyde addition.
- Hassan Tolba, Amal,Krupi?ka, Martin,Chudoba, Josef,Cibulka, Radek
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supporting information
p. 6825 - 6830
(2021/09/11)
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- Amidation of Aldehydes with Amines under Mild Conditions Using Metal-Organic Framework Derived NiO@Ni Mott-Schottky Catalyst
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Here we report a facile method for the synthesis of nickel oxide-nickel (NiO@Ni) Mott-Schottky catalyst employing metal-organic framework (MOF) as the precursor. A direct amidation protocol of aldehydes with amines has been optimized under mild conditions using NiO@Ni Mott-Schottky catalyst and it shows far better catalytic activity than the NiO?Ni nanoparticles prepared from simple Ni2+ salt under similar reaction conditions. The heterogeneous catalyst is robust, recyclable and efficient to provide comparable yield to costly ligand-based homogeneous Ni catalysts. The scope of the reaction protocol has been explored with variably substituted substrates. The reaction initiates by homolytic cleavage of peroxide and proceeds through radical mechanism.
- Goel, Bharat,Vyas, Ved,Tripathi, Nancy,Kumar Singh, Ajit,Menezes, Prashanth W.,Indra, Arindam,Jain, Shreyans K.
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p. 5743 - 5749
(2020/09/09)
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- A practical catalytic reductive amination of carboxylic acids
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We report reductive alkylation reactions of amines using carboxylic acids as nominal electrophiles. The two-step reaction exploits the dual reactivity of phenylsilane and involves a silane-mediated amidation followed by a Zn(OAc)2-catalyzed amide reduction. The reaction is applicable to a wide range of amines and carboxylic acids and has been demonstrated on a large scale (305 mmol of amine). The rate differential between the reduction of tertiary and secondary amide intermediates is exemplified in a convergent synthesis of the antiretroviral medicine maraviroc. Mechanistic studies demonstrate that a residual 0.5 equivalents of carboxylic acid from the amidation step is responsible for the generation of silane reductants with augmented reactivity, which allow secondary amides, previously unreactive in zinc/phenylsilane systems, to be reduced.
- Andrews, Keith G.,Denton, Ross M.,Hirst, David J.,Stoll, Emma L.,Tongue, Thomas,Valette, Damien
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p. 9494 - 9500
(2020/10/02)
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- One-Pot Tandem Photoredox and Cross-Coupling Catalysis with a Single Palladium Carbodicarbene Complex
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The combination of conventional transition-metal-catalyzed coupling (2 e? process) and photoredox catalysis (1 e? process) has emerged as a powerful approach to catalyze difficult cross-coupling reactions under mild reaction conditions. Reported is a palladium carbodicarbene (CDC) complex that mediates both a Suzuki–Miyaura coupling and photoredox catalysis for C?N bond formation upon visible-light irradiation. These two catalytic pathways can be combined to promote both conventional transition-metal-catalyzed coupling and photoredox catalysis to mediate C?H arylation under ambient conditions with a single catalyst in an efficient one-pot process.
- Hsu, Yu-Cheng,Wang, Vincent C.-C.,Au-Yeung, Ka-Chun,Tsai, Chung-Yu,Chang, Chun-Chi,Lin, Bo-Chao,Chan, Yi-Tsu,Hsu, Chao-Ping,Yap, Glenn P. A.,Jurca, Titel,Ong, Tiow-Gan
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supporting information
p. 4622 - 4626
(2018/03/21)
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- BODIPY catalyzed amide synthesis promoted by BHT and air under visible light
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A novel and efficient protocol for the synthesis of amides is reported which employs a BODIPY catalyzed oxidative amidation reaction between aromatic aldehydes and amines under visible light. Compared with the known Ru or Ir molecular catalysts and other organic dyes, the BODIPY catalyst showed higher reactivity toward this reaction. Mechanistic studies reveal that dioxygen could be activated through an ET and a SET pathway, forming active peroxides in situ, which are vital for the key step of the reaction, i.e. the oxidation of hemiaminal to amide. The broad substrate scope and mild reaction conditions make this reaction practically useful and environmentally friendly for the synthesis of amide compounds.
- Wang, Xiao-Fei,Yu, Shu-Sheng,Wang, Chao,Xue, Dong,Xiao, Jianliang
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p. 7028 - 7037
(2016/07/30)
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- Synthesis of Ag/g-C3N4Composite as Highly Efficient Visible-Light Photocatalyst for Oxidative Amidation of Aromatic Aldehydes
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In this contribution, an Ag/g-C3N4nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions under visible light irradiation. A layered, porous g-C3N4was synthes
- Wang, Lingling,Yu, Min,Wu, Chaolong,Deng, Nan,Wang, Chao,Yao, Xiaoquan
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p. 2631 - 2641
(2016/08/31)
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- Phenazinium salt-catalyzed aerobic oxidative amidation of aromatic aldehydes
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Amides are prevalent in organic synthesis. Developing an efficient synthesis that avoids expensive oxidants and heating is highly desirable. Here the oxidative amidation of aromatic aldehydes is reported using an inexpensive metal-free visible light photocatalyst, phenazine ethosulfate, at low catalytic loading (1-2 mol %). The reaction proceeds at ambient temperature and uses air as the sole oxidant. The operationally easy procedure provides an economical, green, and mild alternative for the formation of amide bonds.
- Leow, Dasheng
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supporting information
p. 5812 - 5815
(2015/02/19)
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- The structure-activity relationships of L3MBTL3 inhibitors: Flexibility of the dimer interface
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We recently reported the discovery of UNC1215, a potent and selective chemical probe for the L3MBTL3 methyllysine reader domain. In this article, we describe the development of structure-activity relationships (SAR) of a second series of potent L3MBTL3 antagonists which evolved from the structure of the chemical probe UNC1215. These compounds are selective for L3MBTL3 against a panel of methyllysine reader proteins, particularly the related MBT family proteins, L3MBTL1 and MBTD1. A co-crystal structure of L3MBTL3 and one of the most potent compounds suggests that the L3MBTL3 dimer rotates about the dimer interface to accommodate ligand binding.
- Camerino, Michelle A.,Zhong, Nan,Dong, Aiping,Dickson, Bradley M.,James, Lindsey I.,Baughman, Brandi M.,Norris, Jacqueline L.,Kireev, Dmitri B.,Janzen, William P.,Arrowsmith, Cheryl H.,Frye, Stephen V.
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supporting information
p. 1501 - 1507
(2013/11/19)
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- Rhodium-catalyzed synthesis of branched amines by direct addition of benzamides to imines
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Rhodium-catalyzed addition of benzamide C-H bonds to a range of aromatic N-sulfonyl aldimines has been developed and proceeds with high functional group compatibility. The synthetic utility of the resulting branched amine products has also been demonstrated by the preparation of isoindoline and isoindolinone frameworks.
- Hesp, Kevin D.,Bergman, Robert G.,Ellman, Jonathan A.
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supporting information; experimental part
p. 2304 - 2307
(2012/06/30)
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- FUSED PYRAZINE DERIVATIVES AS KINASE INHIBITORS
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A series of quinoxaline derivatives, and analogues thereof, which are functionalised further by a substituted phenyl or pyridinyl moiety, being selective inhibitors of PO kinase enzymes, are accordingly of benefit in medicine, for example in the treatment of inflammatory, autoimmune, cardiovascular, neurodegenerative, metabolic, oncological, nociceptive or ophthalmic conditions.
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Page/Page column 34-35
(2010/06/11)
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- BI-ARYL META-PYRIMIDINE INHIBITORS OF KINASES
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The invention provides biaryl meta-pyrimidine compounds having the general structure (A). The pyrimidine compounds of the invention are capable of inhibiting kinases, such as members of the Jak kinase family, and various other specific receptor and non receptor kinases.
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Page/Page column 206
(2008/06/13)
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