- Synthesis method of key raw material 2-chloro-6-methylaniline of dasatinib
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The invention discloses a synthetic method of a key raw material 2-chloro-6-methylaniline of dasatinib. The method comprises the following steps: firstly, protecting a 1-site amino group of 2-nitro-6-methylaniline, then reducing a 2-site nitro group of 2-nitro-6-methylaniline into an amino group, then carrying out diazotization reaction, carrying out chlorine substitution on the 2-site amino group by using cuprous chloride, and finally, carrying out acidolysis to remove a 1-site amino protecting group to obtain 2-chlorine-6-methylaniline. The method has the advantages of cheap and easily available raw materials, easily controllable reaction, simple operation steps, simple post-treatment, recyclable solvents, small pollution, and suitableness for large-scale production of generative enterprises.
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Paragraph 0016; 0033-0034; 0038-0039
(2021/04/21)
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- Biphenyl-Based Bis(thiourea) Organocatalyst for Asymmetric and syn -Selective Henry Reaction
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A scalable, efficient and chromatography-free synthesis of a new enantiopure C 2-symmetric bis(thiourea) catalyst was accomplished from a readily available starting material. The developed strategy could be conducted on a multi-gram scale. Both the prepared enantiomers of the bis(thiourea) organocatalyst have been tested in the asymmetric Henry reaction under thoroughly optimized conditions during which an unusual solvent effect on enantioselectivity was found. The corresponding adducts were obtained in excellent yields with good to excellent enantioselectivities. The achieved high reactivity and enantioselectivity in the nitroaldol reaction of nitroalkanes with aromatic aldehydes suggests promising potential for this catalyst. Moreover, a significant syn-diastereoselectivity was observed.
- Otevrel, Jan,Bobal, Pavel
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p. 593 - 603
(2017/01/25)
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- Axially Chiral Bifunctional 8,8′-Biquinolyl: Synthesis of 7,7′-Dihydroxymethyl-8,8′-biquinolyl via Pd-Catalyzed Double C-H Oxidation of 7,7′-Dimethyl-8,8′-biquinolyl
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Bifunctional C2-symmetric 7,7′-dihydroxymethyl-8,8′-biquinolyl (2) was synthesized in short steps via (i) Cu/Pd-catalyzed homo coupling of 7-methyl-8-bromoquinoline and (ii) Pd(II)-catalyzed double C-H oxidation. Axial chirality of 2 and its synthetic precursor 7,7′-dimethyl-8,8′-biquinolyl (3) is stable. Optically active 2 was obtained through separation of racemic 2 by chiral column HPLC or Pd(II)-catalyzed double C-H oxidation of optically active 3. The absolute stereochemistry of enantiomers of 2 and 3 was determined using the exciton chirality method.
- Kitamura, Mitsuru,Fukuma, Hiroaki,Kobayashi, Mitsuaki,Okayama, Shinya,Okauchi, Tatsuo
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p. 3956 - 3960
(2016/05/24)
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- Selectivity of the complexation reactions of four regioisomeric methylcamphorquinoxaline ligands with gold(III): X-ray, NMR and DFT investigations
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Reported are the synthesis, spectral and structural characteristics of new quinoxaline-related regioisomeric ligands L1-L4 (1,x,11,11-tetramethyl-1,2,3,4-tetrahydro-1,4-methanophenazine, x = 7, 8, 9 and 6, respectively) and their mononuclear Au(III) complexes (1-4). Fusion of the camphor moiety to the quinoxaline core made two N-atoms of quinoxaline nonequivalent while the introduction of a methyl-substituent at positions 6-9 enabled a tuning of coordination properties of L1-L4. Gold(III) complexes 1-4 and ligands L1-L4 have been studied in detailed by 1D and 2D NMR and the structures of 1-4 have been determined by X-ray crystallography. The results of these analyses revealed a regiospecific coordination of Au(III) to the sterically less hindered N-5 atom (spatially close to the non-substituted bridgehead carbon) of L1-L3, and to N-10 (spatially close to the methyl-substituted bridgehead carbon) of L4. The results of DFT calculations shed light on disparate coordination modes of L1-L4 toward the AuCl3 fragment and explain formation of single coordination products in high yield.
- Gli?i?, Biljana D.,Hoffmann, Marcin,Warzajtis, Beata,Gen?i?, Marija S.,Blagojevi?, Polina D.,Radulovi?, Niko S.,Rychlewska, Urszula,Djuran, Milo? I.
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p. 137 - 149
(2016/01/15)
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- Discovery and optimization of benzotriazine Di-N-oxides targeting replicating and nonreplicating mycobacterium tuberculosis
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Compounds bactericidal against both replicating and nonreplicating Mtb may shorten the length of TB treatment regimens by eliminating infections more rapidly. Screening of a panel of antimicrobial and anticancer drug classes that are bioreduced into cytotoxic species revealed that 1,2,4-benzotriazine di-N-oxides (BTOs) are potently bactericidal against replicating and nonreplicating Mtb. Medicinal chemistry optimization, guided by semiempirical molecular orbital calculations, identified a new lead compound (20q) from this series with an MIC of 0.31 μg/mL against H37Rv and a cytotoxicity (CC 50) against Vero cells of 25 μg/mL. 20q also had equivalent potency against a panel of single-drug resistant strains of Mtb and remarkably selective activity for Mtb over a panel of other pathogenic bacterial strains. 20q was also negative in a L5178Y MOLY assay, indicating low potential for genetic toxicity. These data along with measurements of the physiochemical properties and pharmacokinetic profile demonstrate that BTOs have the potential to be developed into a new class of antitubercular drugs.
- Chopra, Sidharth,Koolpe, Gary A.,Tambo-Ong, Arlyn A.,Matsuyama, Karen N.,Ryan, Kenneth J.,Tran, Tran B.,Doppalapudi, Rupa S.,Riccio, Edward S.,Iyer, Lalitha V.,Green, Carol E.,Wan, Baojie,Franzblau, Scott G.,Madrid, Peter B.
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p. 6047 - 6060
(2012/09/05)
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- SUBSTITUTED AROMATIC CARBOXAMIDE AND UREA DERIVATIVES AS VANILLOID RECEPTOR LIGANDS
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The invention relates to substituted aromatic carboxamide and urea derivatives, to processes for the preparation thereof, to pharmaceutical compositions containing these compounds and also to the use of these compounds for preparing pharmaceutical compositions (formula (I)).
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Page/Page column 124
(2010/11/18)
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- Palladium-catalyzed intermolecular coupling of aryl halides and amides
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The first general intermolecular C-N bond-forming reactions between aryl halides and amides were realized using a palladium catalyst with Xantphos as the ligand. Aryl triflates, carbamates, and sulfonamides are also viable substrates for the amidations, which proceed at 45-110 °C with 1-4 mol% of Pd catalyst in 66-99% yields and exhibit good functional group compatibility.
- Yin, Jingjun,Buchwald, Stephen L.
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p. 1101 - 1104
(2007/10/03)
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- Ozone-mediated Reaction of Anilides and Phenyl Esters with Nitrogen Dioxide: Enhanced Ortho-reactivity and Mechanistic Implications
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In the presence of ozone, anilides 1 can be nitrated rapidly with nitrogen dioxide in chloroform at 0 deg C to give a high proportion of ortho-nitro derivatives (ortho:para = 1.2-4.4) in good yields.The phenyl esters 15 can be similarly nitrated on the aromatic ring without significant cleavage of the ester bond, giving a mixture of isomeric nitro derivatives in which the ortho-isomer predominantes (ortho:para = 1.1-1.5).The oridin of the enhanced ortho reactivity is discussed in terms of an electron-transfer process involving the nitrogen trioxide as initial electrophile.
- Suzuki, Hitomi,Tatsumi, Atsuo,Ishibashi, Taro,Mori, Tadashi
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p. 339 - 344
(2007/10/02)
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- Ruthenium-optically active phosphine complex
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A ruthenium-optically active phosphine complex having, as a ligand, BICHEP which means 2,2'-bis(dicyclohexylphosphino)-6,6'-dimethyl-1,1'-biphenyl represented by formula (I): STR1 is disclosed, which can catalyze asymmetric syntheses, such as asymmetric hydrogenation, asymmetric isomerization, and asymmetric silylation, exhibiting excellent catalytic activity and providing high optical purity.
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- Ortho-Selective Nitration of Acetanilides with Nitrogen Dioxide in the Presence of Ozone
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In the presence of ozone, nitrogen dioxide rapidly reacts with acetanilides ortho-selectively at low temperatures, giving a high proportion of ortho-nitro derivatives in good yields.
- Suzuki, Hitomi,Ishibashi, Taro,Murashima, Takashi,Tsukamoto, Kenkichi
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p. 6591 - 6594
(2007/10/02)
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- Synthesis of N-Acetylbenzimidazole Derivatives
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For the structure determination of thiazolobenzimidazol-3(2H)-one derivatives (2 or 3) they were converted to the corresponding 1-acetylbenzimidazoles (4) by desulfurization.The latter compounds (4) were alternatively prepared by the cyclization of 2-aminoacetanilide derivatives (5) with CS2 in dimethylformamide (DMF), followed by desulfurization with Raney Ni.However, the reactions of 5 with ethyl orthoformate/H2SO4 in DMF gave a mixture of 4 and its acetyl-rearranged product (7).Keywords-acetyl group; rearrangement; thiazolobenzimidazol-3(2H)-one; N-acetylbenzimidazoles; ethyl orthoformate; carbon disulfide; desulfurization
- Tanaka, Kenjiro,Shimazaki, Michiko,Murakami, Yasuoki
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p. 2714 - 2722
(2007/10/02)
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