5650-45-3Relevant academic research and scientific papers
Enantioselective and Diastereoselective Construction of Chiral Amino Alcohols by Iridium-f-Amphox-Catalyzed Asymmetric Hydrogenation via Dynamic Kinetic Resolution
Wu, Weilong,You, Cai,Yin, Congcong,Liu, Yuanhua,Dong, Xiu-Qin,Zhang, Xumu
, p. 2548 - 2551 (2017/05/24)
The iridium-f-amphox-catalyzed asymmetric hydrogenation of racemic α-amino β-unfunctionalized ketones proceeds via a DKR (dynamic kinetic resolution) process for the construction of various chiral N,N-disubstituted α-amino β-unfunctionalized alcohols in quantitative yields with excellent enantioselectivities and diastereoselectivities (all products >99% ee and >99:1 dr, TON up to 100 000). Importantly, this catalytic asymmetric hydrogenation with a DKR process provided a highly efficient and powerful synthetic strategy for the preparation of key chiral intermediates of the preclinical antitumor agent (S,S)-R116010.
A five coordination Cu(II) cluster-based MOF and its application in the synthesis of pharmaceuticals: Via sp3 C-H/N-H oxidative coupling
Tran, Thuan V.,Le, Hanh T. N.,Ha, Hiep Q.,Duong, Xuan N. T.,Nguyen, Linh H.-T.,Doan, Tan L. H.,Nguyen, Ha L.,Truong, Thanh
, p. 3453 - 3458 (2017/08/22)
Herein, a copper metal-organic framework, termed as VNU-18, containing penta-coordinated sites was successfully synthesized and fully characterized. This material was demonstrated to be an efficient heterogeneous catalyst for the oxidative C-H activation via N-H bonds. The optimized conditions are applicable for the synthesis of pharmaceuticals constructed by α-amino carbonyl skeletons.
N-Bromosuccinimide promoted and base switchable one pot synthesis of α-imido and α-amino ketones from styrenes
Shinde, Mahesh H.,Kshirsagar, Umesh A.
supporting information, p. 858 - 861 (2016/01/15)
An N-Bromosuccinimide (NBS) promoted one pot strategy for the synthesis of α-amino functionalized aryl ketones starting from commercially available styrenes has been developed. NBS participates in multiple tasks, such as bromonium ion formation, oxidation of bromohydrin and providing a nucleophilic nitrogen source. The reaction can easily be switched between α-imido and α-amino ketones by the choice of base. This one pot strategy was successfully applied for the synthesis of psychoactive drug candidates, amfepramone, mephedrone and 4-MEC.
A two-step continuous synthesis of α-ketoamides and α-amino ketones from 2° benzylic alcohols using hydrogen peroxide as an economic and benign oxidant
Liu, Chengkou,Fang, Zheng,Yang, Zhao,Li, Qingwen,Guo, Shiyu,Guo, Kai
, p. 25167 - 25172 (2016/03/22)
A practical two-step synthesis of α-ketoamides and α-amino ketones via direct oxidative coupling between 2° benzylic alcohols and amines was developed. Hydrogen peroxide, an economic and environmentally friendly oxidant, was used, and a metal catalyst was unnecessary. Moreover, the continuous-flow technique was employed to increase the functional group tolerance, efficiency and safety.
Copper bromide reagent and its preparation method, α--aminobenzene acetone and its process for synthesis of derivatives of
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Paragraph 0025; 0026, (2017/02/28)
The invention discloses a copper bromide reagent, a preparation method thereof, and a synthesis method of alpha-amido propiophenone and derivative thereof. Copper bromide cheap in industry and 2,6-bi[4-(1,1-dimethyl)-2-oxazoline-2-base] pyridine react to directly obtain high yield of high-purity copper bromide reagent, in addition, the copper bromide reagent and propiophenone containing multiple important functional groups have good reaction activity. Due to the characteristic, high yield of alpha-amido propiophenone and derivative thereof can be obtained in mild conditions, conventional expensive azoic compound materials are not used, the cost is lowered to a large extent, the operation requirement is also lowered, and alpha-amido propiophenone and derivative thereof have good application prospect in industry.
Electrochemically Oxidative α-C-H Functionalization of Ketones: A Cascade Synthesis of α-Amino Ketones Mediated by NH4I
Liang, Sen,Zeng, Cheng-Chu,Tian, Hong-Yu,Sun, Bao-Guo,Luo, Xu-Gang,Ren, Fa-Zheng
, p. 11565 - 11573 (2016/12/09)
An efficient electrochemical protocol for the synthesis of α-amino ketones via the oxidative cross-dehydrogenative coupling of ketones and secondary amines has been developed. The electrochemistry performs in a simple undivided cell using NH4I
A versatile and one-pot strategy to synthesize ?±-amino ketones from benzylic secondary alcohols using N -bromosuccinimide
Guha, Somraj,Rajeshkumar, Venkatachalam,Kotha, Surya Srinivas,Sekar, Govindasamy
, p. 406 - 409 (2015/03/04)
A metal-free one-pot strategy has been developed for the first time to synthesize pharmaceutically important ?±-amino ketones from readily available benzylic secondary alcohols and amines using N-bromosuccinimide. This new reaction proceeds via three consecutive steps involving oxidation of alcohols, ?±-bromination of ketones, and nucleophilic substitution of ?±-bromo ketones to give ?±-amino ketones. Importantly, this novel one-pot greener reaction avoids direct usage of toxic and corrosive bromine. This methodology has been employed efficiently to synthesize pharmaceutically important amfepramone and pyrovalerone in a single step.
Transition-metal-free oxidative α-C-H amination of ketones via a radical mechanism: Mild synthesis of α-amino ketones
Jiang, Qing,Xu, Bin,Zhao, An,Jia, Jing,Liu, Tian,Guo, Cancheng
, p. 8750 - 8756 (2015/01/08)
A transition-metal-free direct α-C.H amination of ketones has been developed using commercially available ammonium iodide as the catalyst and sodium percarbonate as the co-oxidant. A wide range of ketone ((hetero)aromatic or nonaromatic ketones) and amine (primary/secondary amines, anilines, or amides) substrates undergo cross-coupling to generate synthetically useful α-amino ketones. The mechanistic studies indicated that a radical pathway might be involved in the reaction process. The utility of the method is highlighted through a concise one-step synthesis of the pharmaceutical agent amfepramone.
Synthesis and characterization of bisoxazolines- and pybox-copper(II) complexes and their application in the coupling of α-carbonyls with functionalized amines
Jia, Wei-Guo,Li, Dan-Dan,Dai, Yuan-Chen,Zhang, Hui,Yan, Li-Qin,Sheng, En-Hong,Wei, Yun,Mu, Xiao-Long,Huang, Kuo-Wei
supporting information, p. 5509 - 5516 (2014/07/21)
Binuclear complexes [{(DMOX)CuCl}2(μ-Cl)2] (1), mononuclear complexes [(DMOX)CuBr2] (2) (DMOX = 4,5-dihydro-2-(4,5- dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyloxazole) and the pybox Cu(ii) complex [(Dm-Pybox)CuBr2/
Enabling nucleophilic substitution reactions of activated alkyl fluorides through hydrogen bonding
Champagne, Pier Alexandre,Pomarole, Julien,Therien, Marie-Eve,Benhassine, Yasmine,Beaulieu, Samuel,Legault, Claude Y.,Paquin, Jean-Francois
supporting information, p. 2210 - 2213 (2013/06/26)
It was discovered that the presence of water as a cosolvent enables the reaction of activated alkyl fluorides for bimolecular nucleophilic substitution reactions. DFT calculations show that activation proceeds through stabilization of the transition structure by a stronger F···H 2O interaction and diminishing C-F bond elongation, and not simple transition state electrostatic stabilization. Overall, the findings put forward a distinct strategy for C-F bond activation through H-bonding.
