- Tetrahydroindazole inhibitors of CDK2/cyclin complexes
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Over 50 tetrahydroindazoles were synthesized after 7-bromo-3,6,6-trimethyl-1-(pyridin-2-yl)-5,6,7,7a-tetrahydro-1H-indazol-4(3aH)-one (3) was identified as a hit compound in a high throughput screen for inhibition of CDK2 in complex with cyclin A. The activity of the most promising analogues was evaluated by inhibition of CDK2 enzyme complexes with various cyclins. Analogues 53 and 59 showed 3-fold better binding affinity for CDK2 and 2- to 10-fold improved inhibitory activity against CDK2/cyclin A1, E, and O compared to screening hit 3. The data from the enzyme and binding assays indicate that the binding of the analogues to a CDK2/cyclin complex is favored over binding to free CDK2. Computational analysis was used to predict a potential binding site at the CDK2/cyclin E1 interface.
- Lee, Jae Chul,Hong, Kwon Ho,Becker, Andreas,Tash, Joseph S.,Sch?nbrunn, Ernst,Georg, Gunda I.
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- Metal free [4+1] and [5+1] annulation reactions to prepare heterocycles using DMF and its derivatives as one-carbon source
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1,2,4-Triazolo[3,4-a]pyridines and related heterocycles and substituted triazines were commonly discovered scaffolds in a variety of pharmaceutical and agrochemical agents. Herein, we report a highly efficient and practical method using DMF and its derivative for the [4+1] and [5+1] annulation reactions to prepare these heterocycles. This metal free reaction takes advantages of shelf stable DMF as solvent and carbon donor, imidazole chloride as a catalyst, the mild reaction condition tolerates a broad substrate range and substitutes. The prepared 3-unsubstituted 1,2,4-triazolo[3,4-a]pyridine and derivatives allow further introduction of a variety of functional group1 at 3-position.
- Liu, Lingfeng,Qiao, Chunhua,Shen, Bei,Xu, Yiwen
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supporting information
(2020/04/01)
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- 2-Pyridylnitrene-1,3-diazacyclohepta-1,2,4,6-tetraene rearrangements in the trifluoromethyl-2-pyridyl azide series
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Photolysis of Ar matrix isolated trifluoromethyl-substituted 2-pyridyl azides/tetrazolo[1,5-a]pyridines at 12-18 K causes rapid and mostly clean conversion to the corresponding 1,3-diazacyclohepta-1,2,4,6-tetraenes (4D, 5D, 5,6D, and 4,6D) absorbing near 2000 cm-1 in the IR. In the latter case, the intermediate 3,5-bis(trifluoromethyl)-2-pyridylnitrene (4,6N) was observed by both ESR and IR spectroscopy and converted to the diazacycloheptatetraene 4,6D in the course of 90 min of UV irradiation. The 2-pyridylnitrenes were generally observable by ESR spectroscopy (D/hc ~ 1.05-1.10; E/hc ~ 0.0 cm-1) following both photochemical and thermal (FVP) generation from the 2-azidopyridines. Irradiation of the Ar matrix isolated mixtures of nitrenes and diazacycloheptatetraenes also caused development of weak carbene transitions (D/hc ~ 0.40-0.45; E/hc ~ 0.006 cm-1) in the ESR spectra.
- Evans,Wah Wong,Wentrup
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p. 4009 - 4017
(2007/10/03)
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- Trifluoromethyl-substituted Dehydrodiazepines and Cyanopyrroles from Azido-/Tetrazolo-pyridines
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1,2-Didehydro-1,3-diazepines 4D, 5D, 4,6D and 5,6D are identified as unique products of both photolysis and thermolysis of azido-/tetrazolo-pyridines; the ultimate thermolysis products are trifluoromethylpyrrolecarbonitriles (7-9, 11-13 and 16-18).
- Evans, Richard A.,Wentrup, Curt
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p. 1062 - 1064
(2007/10/02)
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- Novel aminoalkylthio derivatives of triazolopyridine or triazoloquinoline, the processes for their preparation, and drugs, useful especially as analgesics, in which they are present
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The present invention relates to novel compounds corresponding to the formula: STR1 in which: n represents an integer between 1 and 8 and optimally 2 or 3; (CH2)n --N can also form a ring or a heterocycle, for example having 5 to 7 atoms and preferably 6 atoms; R1 and R2 can represent hydrogen or a lower alkyl having 1 to 5 carbon atoms or can form, together with the nitrogen, a ring such as pyrrolidine, piperidine, morpholine, thiomorpholine, phenyltetrahydropyridine, piperazine or piperazine N-substituted by an alkyl, a phenyl or a heterocycle; in the case of the phenyltetrahydropyridines and the phenylpiperazines or heteroarylpiperazines, the phenyl or the heterocycle may or may not be substituted by halogens or methoxy, thiomethyl, hydroxyl, nitro, amino, cyano, lower alkyl, trifluoromethyl or trichloromethyl groups; and R3, R4 and R5 can represent hydrogen, a lower alkyl, a hydroxyalkyl or hydroxybenzyl group, a halogen, a trifluoromethyl, a methoxy, a thiomethyl or a nitro or two of them can form a ring, in particular a phenyl in the case of the triazoloquinolines or the triazoloisoquinolines; and the non-toxic acid addition salts. These products are useful as drugs and possess analgesic properties, acting especially on the central nervous system as minor tranquilizers.
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