194869-15-3Relevant academic research and scientific papers
Synthesis, inhibitory activity and in silico docking of dual COX/5-LOX inhibitors with quinone and resorcinol core
Sisa, Miroslav,Dvorakova, Marcela,Temml, Veronika,Jarosova, Veronika,Vanek, Tomas,Landa, Premysl
, (2020/07/31)
Based on the significant anti-inflammatory activity of natural quinone primin (5a), series of 1,4-benzoquinones, hydroquinones, and related resorcinols were designed, synthesized, characterized and tested for their ability to inhibit the activity of cyclooxygenase (COX-1 and COX-2) and 5-lipoxygenase (5-LOX) enzymes. Structural modifications resulted in the identification of two compounds 5b (2-methoxy-6-undecyl-1,4-benzoquinone) and 6b (2-methoxy-6-undecyl-1,4-hydroquinone) as potent dual COX/5-LOX inhibitors. The IC50 values evaluated in vitro using enzymatic assay were for compound 5b IC50 = 1.07, 0.57, and 0.34 μM and for compound 6b IC50 = 1.07, 0.55, and 0.28 μM for COX-1, COX-2, and 5-LOX enzyme, respectively. In addition, compound 6d was identified as the most potent 5-LOX inhibitor (IC50 = 0.14 μM; reference inhibitor zileuton IC50 = 0.66 μM) from the tested compounds while its inhibitory potential against COX enzymes (IC50 = 2.65 and 2.71 μM for COX-1 and COX-2, respectively) was comparable with the reference inhibitor ibuprofen (IC50 = 4.50 and 2.46 μM, respectively). The most important structural modification leading to increased inhibitory activity towards both COXs and 5-LOX was the elongation of alkyl chain in position 6 from 5 to 11 carbons. Moreover, the monoacetylation in ortho position of bromo-hydroquinone 13 led to the discovery of potent (IC50 = 0.17 μM) 5-LOX inhibitor 17 (2-bromo-6-methoxy-1,4-benzoquinone) while bromination stabilized the hydroquinone form. Docking analysis revealed the interaction of compounds with Tyr355 and Arg120 in the catalytic site of COX enzymes, while the hydrophobic parts of the molecules filled the hydrophobic substrate channel leading up to Tyr385. In the allosteric catalytic site of 5-LOX, compounds bound to Tyr142 and formed aromatic interactions with Arg138. Taken together, we identified optimal alkyl chain length for dual COX/5-LOX inhibition and investigated other structural modifications influencing COX and 5-LOX inhibitory activity.
The cooperative FeCl3/DDQ system for the regioselective synthesis of 3-arylindoles from β-monosubstituted 2-alkenylanilines
Jang, Su San,Youn, So Won
supporting information, p. 2200 - 2204 (2016/03/01)
A highly regioselective synthesis of 3-arylindoles by using the cooperative FeCl3/DDQ system has been developed. This new protocol represents an attractive route for the synthesis of 3-arylindoles from readily accessible non-indole precursors, β-aryl-substituted 2-styrylanilines, using an inexpensive catalyst and oxidant. Noteworthy is the unique synergetic and synergistic effect of FeCl3 and DDQ on the 1,2-aryl migratory process.
IMIDAZO[1,2-A]PYRIDINE COMPOUNDS AS RECEPTOR TYROSINE KINASE INHIBITORS
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Page/Page column 45, (2008/12/04)
Compounds of Formula I: in which A, B, R1, R1a, R2, R3, R4, R5 R6, R7 and R8 have the meanings given in the specification, are receptor tyrosine inhibitors useful in the treatment of diseases mediated by class 3 and class 5 receptor tyrosine kinases. Particular compounds of this invention have also been found to be inhibitors of Pim-1.
IMIDAZO[1,2-A]PYRIDINE COMPOUNDS AS RECEPTOR TYROSINE KINASE INHIBITORS
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Page/Page column 68, (2008/12/04)
Compounds of Formula (I) in which A, B, R1, R1a, R2, R3, R4, R5, R6, R7 and R8 have the meanings given in the specification, are receptor tyrosine inhibitors useful in the treatment of diseases mediated by class 3 and class 5 receptor tyrosine kinases. Particular compounds of this invention have also been found to be inhibitors of Pim-1
Gold- and indium-catalyzed synthesis of 3- and 6-sulfonylindoles from ortho-alkynyl-N-sulfonylanilines
Nakamura, Itaru,Yamagishi, Uichiro,Song, Dschun,Konta, Sayaka,Yamamoto, Yoshinori
, p. 2284 - 2287 (2008/02/12)
(Chemical Equation Presented) Consecutive formation of C-N and C-S bonds: The gold-catalyzed intramolecular aminosulfonylation of 2-alkynyl-N- sulfonylanilines 1 (R1 = H) produces 3-sulfonylindoles 2 in good to high yields, whereas the indium-c
Synthesis of ring-A-substituted tryptophan by a palladium-catalyzed heteroannulation reaction
Jia, Yanxing,Zhu, Jieping
, p. 2469 - 2472 (2007/10/03)
Coupling of substituted o-iodoanilines with methyl (S)-2-N,N-di-tert- butoxycarbonyl-5-oxo-pentanoate, derived from glutamic acid, in DMF in the presence of palladium acetate and DABCO provides substituted tryptophans in good to excellent yields. Georg Thieme Verlag Stuttgart.
INDOLE DERIVATIVES AND DRUGS CONTAINING THE SAME
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Page/Page column 20, (2010/02/11)
An indole derivative represented by the following general formula (1) : wherein at least one of R1, R2, R3, and R4 represents an alkoxy group containing 1 to 20 carbon atoms, and other groups of the R1, R2, R3, and R4 represent hydrogen, an alkyl group containing 1 to 6 carbon atoms, acetyl group, or hydroxyl group; and either one of X and Y represents -(CH2)nOH wherein n is an integer of 0 to 30, and the other one of the X and Y represents hydrogen atom; or a salt thereof; and a drug and an agent for promoting differentiation of a stem cell containing such indole derivative or its salt as an effective component. The indole derivative (1) of the present invention has action of inducing differentiation of neural stem cell specifically into a neuron, and this indole derivative is useful as a prophylactic or therapeutic drug for brain dysfunction or neuropathy caused by loss or degeneration of the neuron.
Synthesis of macrocyclic, potential inhibitors using a generic scaffold
Dumez, Estelle,Snaith, John S.,Jackson, Richard F. W.,McElroy, Andrew B.,Overington, John,Wythes, Martin J.,Withka, Jane M.,McLellan, Thomas J.
, p. 4882 - 4892 (2007/10/03)
A generic macrocyclic peptide structure 2 was designed as a potential inhibitor of a range of proteinases, by using as a basis for the design the known structures of a series of enzyme-inhibitor complexes. The macrocyclic nature of the target 2 was chosen so as to reduce the entropic advantage in the hydrolytic enzymatic step, and thereby to inhibit the function of the enzyme. The nature of the linking group was identified as a benzoxazole by molecular modeling, so as to preserve the recognized conformation of the peptide chain. The specificity of the potential inhibitor was tuned by variation of the P1 group (by incorporating phenylalanine, aspartic acid, or lysine), to allow recognition by different enzyme classes. The targets were prepared from the bis-amino acid derivative 5, itself prepared using the Pd-catalyzed coupling of an organozinc reagent with the iodobenzothiazole 7 and subsequent macrocyclization of the open-chain derivatives 22-24 using HATU. None of the macrocylic compounds 25, 28-30, and 32 inhibited their target enzymes. NMR and MS studies on the interaction of macrocycle 29 and chymotrypsin established that compound 29 was in fact a substrate of the enzyme. This result indicated that while the design had been partially successful in identifying a compound that bound, the reduction in entropic advantage due to its macrocyclic nature was not sufficient to allow 29 to act as an inhibitor.
General and facile synthesis of indoles with oxygen-bearing substituents at the benzene moiety
Kondo, Yoshinori,Kojima, Satoshi,Sakamoto, Takao
, p. 6507 - 6511 (2007/10/03)
Indoles with oxygen-bearing substituents such as a methoxy or (triisopropylsilyl)oxy group at all of the positions of the benzene moiety were synthesized by cyclization of tert-butyl methoxy(or (triisopropylsilyl)oxy)-2-((trimethylsilyl)ethynyl)phenyl)carbamates with potassium tert-butoxide in tert-butyl alcohol. The (ethynylphenyl)carbamates were synthesized by the palladium-catalyzed reaction of (trimethylsilyl)acetylene and the corresponding (iodophenyl)carbamates, which were selectively synthesized by directed lithiation of the phenylcarbamates and subsequent iodination.
