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112111-47-4Relevant articles and documents
Spectroscopic and molecular modeling methods to investigate the interaction between psycho-stimulant modafinil and calf thymus DNA using ethidium bromide as a fluorescence probe
Akbay, Nuriye,Koksal, Zeynep,Oguzcan, Esra,Taskin-Tok, Tugba,Uzgoren-Baran, Ayse
, (2022/01/08)
Interaction type of modafinil with calf thymus DNA (ct-DNA) was examined systematically using ethidium bromide (EB) as a fluorescence probe by fluorescence spectroscopy, UV–Vis spectroscopy, viscosity and molecular docking method. The fluorescence quenchi
Luminescent cis-Bis(bipyridyl)ruthenium(II) Complexes with 1,2-Azolylamidino Ligands: Photophysical, Electrochemical Studies, and Photocatalytic Oxidation of Thioethers
Cuéllar, Elena,Diez-Varga, Alberto,Torroba, Tomás,Domingo-Legarda, Pablo,Alemán, José,Cabrera, Silvia,Martín-Alvarez, Jose M.,Miguel, Daniel,Villafa?e, Fernando
, p. 7008 - 7022 (2021/05/29)
New 1,2-azolylamidino complexes cis-[Ru(bipy)2(NH=C(R)az*-κ2N,N)](OTf)2 (R = Me, Ph; az? = pz, indz, dmpz) are synthesized via chloride abstraction after a subsequent base-catalyzed coupling of a nitrile with the previously coordinated 1,2-azole. The synt
Nickel-catalyzed oxidative dehydrogenative coupling of alkane with thiol for C(sp3)-S bond formation
Liu, Shengping,Jin, Shengnan,Wang, Hao,Qi, Zaojuan,Hu, Xiaoxue,Qian, Bo,Huang, Hanmin
, (2021/03/15)
A nickel-catalyzed oxidative dehydrogenative coupling reaction of alkane with thiol for the construction of C(sp3)-S bond has been established, affording more than 50 alkyl thioethers. Notably, pharmaceutical and agrochemicals, such as Provigil, Chlorbenside and Pyridaben, were readily synthesized by this approach. The sterically hindered ligand BC and disulfide which was formed in situ oxidation of thiol, efficiently avoiding nickel-catalyst poisoning. A set of mechanistic experiments disclose both Ni-catalyzed and Ni-free HAA processes.
Covalent Organic Frameworks toward Diverse Photocatalytic Aerobic Oxidations
Liu, Shuyang,Tian, Miao,Bu, Xiubin,Tian, Hua,Yang, Xiaobo
supporting information, p. 7738 - 7744 (2021/05/07)
Photoactive two-dimensional covalent organic frameworks (2D-COFs) have become promising heterogenous photocatalysts in visible-light-driven organic transformations. Herein, a visible-light-driven selective aerobic oxidation of various small organic molecules by using 2D-COFs as the photocatalyst was developed. In this protocol, due to the remarkable photocatalytic capability of hydrazone-based 2D-COF-1 on molecular oxygen activation, a wide range of amides, quinolones, heterocyclic compounds, and sulfoxides were obtained with high efficiency and excellent functional group tolerance under very mild reaction conditions. Furthermore, benefiting from the inherent advantage of heterogenous photocatalysis, prominent sustainability and easy photocatalyst recyclability, a drug molecule (modafinil) and an oxidized mustard gas simulant (2-chloroethyl ethyl sulfoxide) were selectively and easily obtained in scale-up reactions. Mechanistic investigations were conducted using radical quenching experiments and in situ ESR spectroscopy, all corroborating the proposed role of 2D-COF-1 in photocatalytic cycle.
Alloxan-catalyzed biomimetic oxidations with hydrogen peroxide or molecular oxygen
Zhang, Shiqi,Li, Guangxun,Li, Ling,Deng, Xiongfei,Zhao, Gang,Cui, Xin,Tang, Zhuo
, p. 245 - 252 (2019/12/24)
Inspired by biological flavin catalysis, the nonionic alloxan derivatives were applied as the biomimetic catalysts for various oxidations, catalyzing oxidations of sulfides and amines with hydrogen peroxide or molecular oxygen under mild conditions with high yields in a short time. The whole catalytic cycle has been verified to be a biomimetic approach through the formation of the alloxan hydroperoxide reactive intermediate. Additionally, encouraging asymmetric catalytic results have been obtained with an easily prepared chiral alloxan in a sulfoxidation reaction.
Preparation method of alkyl sulfide
-
, (2019/12/02)
The invention relates to a preparation method of alkyl sulfide. The method comprises the following steps: under the protection of nitrogen, sequentially adding transition metal, a nitrogen ligand, a cocatalyst, an oxidant, a solvent, alkane and thiophenol or mercaptan into a reaction tube, carrying out oxidative dehydrogenation coupling reaction at 80-150 DEG C, ending the reaction after 6-48 hours, evaporating the solvent to dryness, and carrying out column chromatography separation to obtain the alkyl sulfide compound. The method is simple in synthesis process, mild in reaction condition, high in yield and easy to industrialize.
Formamide catalyzed activation of carboxylic acids-versatile and cost-efficient amidation and esterification
Huy, Peter H.,Mbouhom, Christelle
, p. 7399 - 7406 (2019/08/20)
A novel, broadly applicable method for amide C-N and ester C-O bond formation is presented based on formylpyrrolidine (FPyr) as a Lewis base catalyst. Herein, trichlorotriazine (TCT), which is the most cost-efficient reagent for OH-group activation, was employed in amounts of ≤40 mol% with respect to the starting material (100 mol%). The new approach is distinguished by excellent cost-efficiency, waste-balance (E-factor down to 3) and scalability (up to >80 g). Moreover, high levels of functional group compatibility, which includes acid-labile acetals and silyl ethers, are demonstrated and even peptide C-N bonds can be formed. In comparison to reported amidation procedures using TCT, yields are considerably improved (for instance from 26 to 91%) and esterification is facilitated for the first time in synthetically useful yields. These significant enhancements are rationalized by activation by means of acid chlorides instead of less electrophilic acid anhydride intermediates.
Selective Late-Stage Oxygenation of Sulfides with Ground-State Oxygen by Uranyl Photocatalysis
Li, Yiming,Rizvi, S. Aal-e-Ali,Hu, Deqing,Sun, Danwen,Gao, Anhui,Zhou, Yubo,Li, Jia,Jiang, Xuefeng
supporting information, p. 13499 - 13506 (2019/08/21)
Oxygenation is a fundamental transformation in synthesis. Herein, we describe the selective late-stage oxygenation of sulfur-containing complex molecules with ground-state oxygen under ambient conditions. The high oxidation potential of the active uranyl cation (UO22+) enabled the efficient synthesis of sulfones. The ligand-to-metal charge transfer process (LMCT) from O 2p to U 5f within the O=U=O group, which generates a UV center and an oxygen radical, is assumed to be affected by the solvent and additives, and can be tuned to promote selective sulfoxidation. This tunable strategy enabled the batch synthesis of 32 pharmaceuticals and analogues by late-stage oxygenation in an atom- and step-efficient manner.
Sulfoxide and sulfone compounds, as well as selective synthesis method and application thereof
-
Paragraph 0045-0048; 0194-0196, (2019/12/02)
The invention discloses a method for selectively synthesizing a sulfoxide compound shown as a formula (II) and a sulfone compound shown as a formula (III). In a reaction solvent, thioether (I) is usedas a reaction raw material and oxygen as an oxidation reagent, under the catalytic action of visible light and a photosensitive reagent; under the assistance of an additive, when a large-polarity proton-containing additive such as an acid and an alcohol or a solvent or an additive with excellent electron donating ability is used, a sulfoxide compound (II) is selectively generated; and when a small-polarity aprotic additive or a solvent is used, a sulfone compound (III) is selectively generated. The synthesis method has the advantages of easily available and cheap raw materials, simple reaction operation, mild reaction conditions, high yield and excellent functional group tolerance. According to the invention, synthesis and modification of some medicines are realized, and an efficient method for selectively constructing sulfoxide and sulfone compounds is provided for medicinal chemistry research.
Efficient atom and step economic (EASE) synthesis of the "smart drug" Modafinil
Maurya, Shivam,Yadav, Dhiraj,Pratap, Kemant,Kumar, Atul
, p. 629 - 633 (2017/08/18)
Modafinil (2-[(diphenylmethyl)sulfinyl]acetamide, MOD) is a key psychostimulant drug used for the treatment of narcolepsy and other sleep disorders that has a very low addiction liability. Recently, MOD has been clinically investigated for the treatment of cocaine addiction and used by astronauts in long-term space missions. We have developed a synthetic strategy for "smart drug" Modafinil. An efficient atom and step economic (EASE) synthesis has been carried out by the direct reaction of benzhydrol and 2-mercaptoacetamide using the recyclable heterogeneous catalyst Nafion-H along with post-sulfoxidation. This protocol exhibits improved sustainability credentials. We have also developed a superior pre-sulfoxidation approach for the synthesis of Modafinil.