共查询到20条相似文献,搜索用时 31 毫秒
1.
Ivachtchenko AV Golovina ES Kadieva MG Kysil VM Mitkin OD Tkachenko SE Okun I 《Bioorganic & medicinal chemistry》2011,19(4):1482-1491
Syntheses of a series of novel 3-sulfonyl-pyrazolo[1,5-a]pyrimidines and their 5-HT(6) receptor antagonistic structure-activity relationship are disclosed. The nature and position of substituents, which affect their receptor antagonistic activity, are analyzed. Among all synthesized derivatives, {3-(3-chlorophenylsulfonyl)-5,7-dimethyl-pyrazolo[1,5-a]pyrimidin-2-yl}-methyl-amine 33 (K(i)=190 pM), (3-phenylsulfonyl-7-methyl-pyrazolo[1,5-a]pyrimidin-2-yl)-methyl-amine 44 (K(i)=240 pM), (3-phenylsulfonyl-5-metoxymethyl-7-methyl-pyrazolo[1,5-a]pyrimidin-2-yl)-methyl-amine 50 (K(i)=270 pM), and (3-phenylsulfonyl-5-methyl-7-metoxymethyl-pyrazolo[1,5-a]pyrimidin-2-yl)-methyl-amine 52 (K(i)=280 pM) are the most potent antagonists of the 5-HT(6) receptors. 相似文献
2.
3.
Shaaban MR Saleh TS Mayhoub AS Mansour A Farag AM 《Bioorganic & medicinal chemistry》2008,16(12):6344-6352
A series of pyrazolo[1,5-a]pyrimidine, triazolo[1,5-a]pyrimidine, and pyrimido[1,2-a]benzimidazole ring systems incorporating phenylsulfonyl moiety were synthesized via the reaction of 3-(N,N-dimethylamino)-1-aryl-2-(phenylsulfonyl)prop-2-en-1-one derivatives 2a,b with appropriate nitrogen nucleophiles. The analgesic and anti-inflammatory activities of the newly synthesized compound were investigated in vivo. 3-Bromo-2-phenyl-6-(phenylsulfonyl)-7-(4-methylphenyl)pyrazolo[1,5-a]pyrimidine (5e) was found to have an excellent analgesic activity in comparison with indomethacin as a reference drug, while the highest anti-inflammatory effect was observed in the case of 2-(4-bromophenyl)-6-(phenylsulfonyl)-5-(4-methylphenyl)pyrazolo[1,5-a]pyrimidine (5d). From the structure-activity relationship (SAR) point of view, the analgesic/anti-inflammatory activity of pyrazolo[1,5-a]pyrimidine derivatives was found to be much higher than triazolo[1,5-a]pyrimidine and pyrimido[1,2-a]benzimidazole derivatives. 相似文献
4.
Holla BS Mahalinga M Karthikeyan MS Akberali PM Shetty NS 《Bioorganic & medicinal chemistry》2006,14(6):2040-2047
The reaction of 4-hydrazino-8-(trifluoromethyl)quinoline (2) with ethoxymethylenecyanoacetate afforded ethyl 5-amino-1-[8-(trifluoromethyl)quinolin-4-yl]-1H-pyrazole-4-carboxylate (3) and that with ethoxymethylenemalononitrile afforded 5-amino-1-[8-(trifluoromethyl)quinolin-4-yl]-1H-pyrazole-4-carbonitrile (5). Compounds 3 and 5 were hydrolyzed to get 5-amino-1-[8-(trifluoromethyl)quinolin-4-yl]-1H-pyrazole-4-carboxylic acid and then reacted with acetic anhydride to afford 6-methyl-1-[8-(trifluoromethyl)quinolin-4-yl]pyrazolo[3,4-d]oxazin-4-one (6), which was condensed with different aromatic amines to give a series of 5-substituted 6-methyl-1-[8-(trifluoromethyl)quinolin-4-yl]-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-ones (7). Compounds 3 and 5 also reacted with formamide, urea, and thiourea affording the corresponding pyrazolo[3,4-d]pyrimidines (8-13), respectively. Structures of the products have been determined by chemical reactions and spectral studies. All compounds of the series have been screened for their antibacterial and antifungal activity studies. The results are summarized in Tables 1 and 2. 相似文献
5.
K Ochiai S Takita A Kojima T Eiraku N Ando K Iwase T Kishi A Ohinata Y Yageta T Yasue DR Adams Y Kohno 《Bioorganic & medicinal chemistry letters》2012,22(18):5833-5838
(-)-6-(7-Methoxy-2-trifluoromethylpyrazolo[1,5-a]pyridin-4-yl)-5-methyl-4,5-dihydro-3-(2H)-pyridazinone (KCA-1490) is a dual PDE3/4 inhibitor that exhibits potent combined bronchodilatory and anti-inflammatory activity. Here we show that a 4,4-dimethylpyrazolone subunit serves as an effective surrogate for the 5-methyl-4,5-dihydropyridazin-3(2H)-one ring of KCA-1490 whilst lacking a stereogenic centre. The 2- and 7-substituents in the pyrazolo[1,5-a]pyridine subunit markedly influence the PDE-inhibitory profile and can be adjusted to afford either potent PDE4-selective inhibitors or dual PDE3/4 inhibitors. A survey of bicyclic heteroaromatic replacements for the pyrazolo[1,5-a]pyridine allowed further refinement of the inhibitory profile and identified 3-(8-methoxy-2-(trifluoromethyl)imidazo[1,2-a]pyridin-5-yl)-4,4-dimethyl-1H-pyrazol-5(4H)-one as an orally active, achiral KCA-1490 analog with well-balanced dual PDE3/4-inhibitory activity. 相似文献
6.
Moukha-chafiq O Taha ML Lazrek HB Vasseur JJ De Clercq E 《Nucleosides, nucleotides & nucleic acids》2002,21(2):165-176
The chemical synthesis of some acyclic alpha-(1H-pyrazolo[3,4-d]pyrimidin-4-yl)thioalkylamide nucleosides (10-12)a-c is described. The treatment of IH-pyrazolo[3,4-d]pyrimidin-4-thione 1 with compounds 2a-c gave, regioselectively, ethyl alpha-(1H-pyrazolo[3,4-d]pyrimidin-4-yl)thioalkylates 3a-c, respectively. These heterocycles were alkylated, separately, with alkylating agents 4, 5 and 6 to give, regioselectively, the N1-acyclic nucleosides (7-9)a-c which were deprotected to afford the desired products (10-12)a-c. All synthetic compounds were characterized on the basis of their physical and spectroscopic properties. The products (10-12)a-c were evaluated for their inhibitory effects against the replication of HIV-1 (III(B)), HIV-2 (ROD), various DNA viruses, a variety of tumor-cell lines and M. tuberculosis. No marked biological activity was found. 相似文献
7.
Khan KM Maharvi GM Perveen S Khan MT Abdel-Jalil RJ Shah ST Fecker M Choudhary MI;Atta-ur-Rahman Voelter W 《化学与生物多样性》2005,2(4):470-476
The microwave-assisted synthesis and characterization of the ten new sildenafil (Viagra; 1) analogues 6-15 are described. A detailed structure-activity-relationship (SAR) study revealed that compounds 10 (= 4-ethoxy-N-hydroxy-3-(7-methoxy-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonamide) and 12 (= S-(2-hydroxyethyl) 4-ethoxy-3-(7-methoxy-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonothioate) are extremely potent mushroom tyrosinase inhibitors, with IC50 values (3.59 and 2.15 microM, resp.) below those of the standard inhibitors L-mimosine and kojic acid (IC50 = 3.68 and 16.67 microM, resp.). Compounds 10 and 12 are, thus, the currently most-effective inhibitors of tyrosinase, and bear great potential to be used for the treatment of various skin disorders such as hyperpigmentation, which is associated with high production of melanocytes. 相似文献
8.
The synthesis and anti-inflammatory activity of 4,5-dihydroxy-3-methyl-1H-pyrazolo[3,4-c]pyridazine (4), 4,5-dichloro-3-methyl-1H-pyrazolo[3,4-c]pyridazine (5), 4,-benzoyloxy-3-methyl-1-benzoyl-1H-pyrazolo[3,4-c]pyridazin-5yl benzoate (6), 3-methyl-N4,N5-bis(4-methylphenyl)-1H-pyrazolo[3,4-c]pyridazine-4,5-diamine (7), 4[[5-(4-carboxyanilino)-3-methyl-1H-pyrazolo[3,4-c]pyridazin-4yl]amino]benzoic acid (8), N-[5-(benzoylamino)-3-methyl-1H-pyrazolo[3,4-c]pyridazin-4-yl]benzamide (9) and 3-methyl-N4,N5-bis[4-(1H-benzimidazol-2yl)phenyl]-1H-pyrazolo[3,4-c]pyridazine-4,5-diamine (10) are being reported. 相似文献
9.
Auxin transport inhibition by a new class of synthetic plant growth regulants, the 2-(3-aryl-5-pyrazolyl)benzoic acids, was examined in bean (Phaseolus vulgaris L.) using the donor-receiver agar cylinder technique. These compounds can be prepared by the dehydrogenation and ring cleavage of compounds like DPX-1840 (2-(4-methoxyphenyl)-3,3adihydro-8H-pyrazolo[5,1-a] isoindol-8-one) which was previously reported (Plant Physiol. 1972. 50: 322-327) to be a potent inhibitor of auxin transport. These new growth regulators inhibit auxin transport more than DPX-1840 does as evidenced by their consistently greater reduction of basipetal auxin transport capacity in bean when incorporated into the receiver agar cylinder or applied foliarly to intact plants. Direct comparisons of the effect of DPX-1840, its dehydrogenation product (2-(4-methoxyphenyl)-8H-pyrazolo [5,1-a]isoindol-8-one), and its open-ring form (2-(3-(4-methoxyphenyl)-5-pyrazolyl) benzoic acid) on auxin transport indicated the following order of activity: ring-open > dehydrogenated form > DPX-1840. DPX-1840-(14)C, applied at 0.5 mg/l to etiolated bean hypocotyl hooks followed by extraction and thin layer chromatography, indicated the biological conversion of DPX-1840 to its open-ring form. Collectively, these results suggest that the biologically active forms of DPX-1840-type compounds are the open-ring (2-(3-aryl-5-pyrazolyl) benzoic acids. 相似文献
10.
Gentles RG Hu S Huang Y Grant-Young K Poss MA Andres C Fiedler T Knox R Lodge N Weaver CD Harden DG 《Bioorganic & medicinal chemistry letters》2008,18(20):5694-5697
An exploratory SAR study on a series of potent, non-apamin-displacing 4-(aminomethylaryl)pyrazolopyrimidine K(Ca) channel blockers is described and their selectivity against K(Ca) channel subtypes is reported. The most potent analog, 5-chloro-N-(thiophen-2-ylmethyl)pyrazolo[1,5-a]pyrimidin-7-amine (24) displayed sub-micromolar activity in both a thallium flux and whole-cell electrophysiology assay and did not displace apamin in a competitive binding study. 相似文献
11.
Sankaran M Kumarasamy C Chokkalingam U Mohan PS 《Bioorganic & medicinal chemistry letters》2010,20(23):7147-7151
A series of novel pyrimido and other fused quinoline derivatives like 4-methyl pyrimido [5,4-c]quinoline-2,5(1H,6H)-dione (4a), 4-methyl-2-thioxo-1,2-dihydropyrimido [5,4-c]quinoline-5(6H)-one (4b), 2-amino-4-methyl-1,2-dihydropyrimido [5,4-c]quinolin-5(6H)-one (4c), 3-methylisoxazolo [4,5-c]quinolin-4(5H)-one (4d), 3-methyl-1H-pyrazolo [4,3-c]quinoline-4(5H)-one (5e), 5-methyl-1H-[1,2,4] triazepino [6,5-c]quinoline-2,6(3H,7H)-dione (5f), 5-methyl-2-thioxo-2,3-dihydro-1H-[1,2,4]triazepino [6,5-c]quinolin-6(7H)-one (5 g) were synthesized regioselectively from 4-hydroxy-3-acyl quinolin-2-one 3. They were screened for their in vitro antioxidant activities against radical scavenging capacity using DPPH(), Trolox equivalent antioxidant capacity (TEAC), total antioxidant activity by FRAP, superoxide radical (O(2)(°-)) scavenging activity, metal chelating activity and nitric oxide scavenging activity. Among the compounds screened, 4c and 5 g exhibited significant antioxidant activities. 相似文献
12.
Ochiai K Takita S Eiraku T Kojima A Iwase K Kishi T Fukuchi K Yasue T Adams DR Allcock RW Jiang Z Kohno Y 《Bioorganic & medicinal chemistry》2012,20(5):1644-1658
(-)-6-(7-Methoxy-2-trifluoromethylpyrazolo[1,5-a]pyridin-4-yl)-5-methyl-4,5-dihydro-3-(2H)-pyridazinone (KCA-1490) is a dual PDE3/4 inhibitor that exhibits potent combined bronchodilatory and anti-inflammatory activity. A survey of potential bicyclic heteroaromatic replacement subunits for the pyrazolo[1,5-a]pyridine core of KCA-1490 has identified the 4-methoxy-2-(trifluoromethyl)benzo[d]thiazol-7-yl and 8-methoxy-2-(trifluoromethyl)quinolin-5-yl analogues as dual PDE3/4-inhibitory compounds that potently suppress histamine-induced bronchoconstriction and exhibit anti-inflammatory activity in vivo. 相似文献
13.
Xiao D Palani A Sofolarides M Aslanian R West RE Williams SM Wu RL Hwa J Sondey C Lachowicz J Korfmacher WA 《Bioorganic & medicinal chemistry letters》2012,22(9):3354-3357
A structure-activity relationship study was undertaken to address the lack of oral exposure of the H3 antagonist 1, which incorporated an arylketone. Among a number of sub-series, the 4H-pyrido[1,2-a]pyrimidin-4-one analog 21 showed an improved PK profile in rat and mouse and was active in an obesity model. The pyrimidin-4-one proved to be a novel and useful ketone bioisostere. 相似文献
14.
Five indole alkaloids (naucleofficines A-E) were isolated from the stems (with bark) of Nauclea officinalis: (E)-2-(1-beta-d-glucopyranosyloxybut-2-en-2-yl)-3-(hydroxymethyl)-6,7-dihydro-indolo[2,3-a]quinolizin-4(12H)-one (1), (E)-1-propenyl-12-beta-d-glucopyranosyloxy-2,7,8-trihydro-indolo[2,3-a]pyran[3,4-g]quinolizin-4,5(13H)-dione (2), (E)-2-(1-hydroxybut-2-en-2-yl)-11-beta-d-glucopyranosyloxy-6,7-dihydro-indolo[2,3-a]quinolizin-4(12H)-one (3), (E)-1-propenyl-4-hydroxy-2,4a,7,8,13b,14,14a-hepthydro-(4alpha,4abeta,13balpha,14abeta)indolo[2,3-a]pyran[3,4-g]quinolizin-5(13H)-one (4) and 1-(1-hydroxyethyl)-10-hydroxy-7,8-dihydro-indolo[2,3-a]pirydine[3,4-g]quinolizin-5(13H)-one (10-hydroxyangustoline) (5), together with two known compounds, naucleidinal (6) and angustoline (7). All of the structures of the seven compounds above were elucidated by spectroscopic methods including use of 1D- and 2D-NMR spectroscopic analyses. Compounds 2 and 3 are rare examples of monoterpene indole alkaloids with a glucopyranosyloxy group attached to position C-12. In vitro activity screening of the above seven compounds showed weak to moderate inhibitory activity against Plasmodium falciparum. 相似文献
15.
Peat AJ Garrido D Boucheron JA Schweiker SL Dickerson SH Wilson JR Wang TY Thomson SA 《Bioorganic & medicinal chemistry letters》2004,14(9):2127-2130
A novel series of [1-(1H-benzimidazol-7-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl] arylhydrazones was synthesized and shown to potently inhibit glycogen synthase kinase-3 (GSK-3). In light of detailed structure-activity relationships and structural knowledge of the GSK-3 binding pocket, a benzimidazole substituent was incorporated onto the pyrazolopyrimidine core resulting in improved potency over previous analogs. More importantly, these derivatives show low nanomolar efficacy for stimulating glycogen synthesis in vitro and therefore may be useful in the treatment of type 2 diabetes mellitus. 相似文献
16.
Coumar MS Wu JS Leou JS Tan UK Chang CY Chang TY Lin WH Hsu JT Chao YS Wu SY Hsieh HP 《Bioorganic & medicinal chemistry letters》2008,18(5):1623-1627
Tricyclic 6,7-dihydro-4H-pyrazolo[1,5-a]pyrrolo[3,4-d]pyrimidine-5,8-dione was identified as a novel scaffold for Aurora kinase A inhibition through virtual screening. SAR exploration coupled with molecular modeling of 8a reveals the minimum pharmacophore requirements for Aurora kinase A inhibition. 相似文献
17.
Hoepping A Diekers M Deuther-Conrad W Scheunemann M Fischer S Hiller A Wegner F Steinbach J Brust P 《Bioorganic & medicinal chemistry》2008,16(3):1184-1194
Neuroimaging of GABA(A) receptors offers the potential for a better diagnosis of diseases related to a dysfunction of the GABAergic neurotransmission. A series of potent fluorinated analogues of the pyrazolopyrimidine Indiplon has been synthesized and evaluated in vitro as potential agents for imaging the GABA(A) receptor by means of positron emission tomography (PET). The most promising compound N-(3-fluoropropyl)-N-[3-[3-(thiophene-2-carbonyl)-pyrazolo[1,5-a]pyrimidin-7-yl]-phenyl]-acetamide (5b) showed an IC(50) value of 2.78+/-0.63 nM comparable to the lead compound Indiplon (IC(50) 3.29+/-0.37 nM), thus making it an interesting candidate for further investigations. In addition to the fluorinated reference compounds, suitable precursors for (18)F-radiolabelling studies have been synthesized. 相似文献
18.
Katsunori Teranishi 《Luminescence》2007,22(2):147-156
During the development of useful probes for detecting superoxide anions via chemiluminescence with longer wavelengths than that of green, chemiluminescent probes that emit red light (lambda(max) 610 nm) when induced by superoxide anions were synthesized and characterized. These red-chemiluminescent probes consist of a 6-(4-methoxyphenyl)imidazo[1,2-a] pyrazin-3(7H)-one moiety, which reacts with superoxide anions to generate energy, and a sulphorhodamine 101 moiety, which accepts the energy and emits red light. Using a hypoxanthine-xanthine oxidase system for the generation of superoxide anions, it was shown that the superoxide anion-induced chemiluminescences of red-chemiluminescent probes (3 and 4) were more intense than those of the blue- and green-chemiluminescent probes 2-methyl-6-(4-methoxyphenyl)imidazo[1,2-a] pyrazin-3(7H)-one (MCLA) and 6-[4-[2-[N'-(5-fluoresceinyl)thioureido]-ethoxy]phenyl]-2-methylimidazo[1,2-a]pyrazin-3(7H)-one (FCLA), respectively, which are generally considered to be the most sensitive chemiluminescent probes. The ratio between the superoxide-dependent and background chemiluminescence intensities for 3 was comparable to those of MCLA and FCLA, but higher than that of 4. Due to its highly intense superoxide anion-induced chemiluminescence at low probe concentrations, red-chemiluminescent probe 3 is superior to MCLA and FCLA for measurement of superoxide anions. 相似文献
19.
E S Gibson K Lesiak K A Watanabe L J Gudas K W Pankiewicz 《Nucleosides & nucleotides》1999,18(3):363-376
A synthesis of the C-nucleoside, 2-amino-7-(2-deoxy-beta-D-erythro- pentofuranosyl)-3H,5H-pyrrolo[3,2-d]pyrimidin-4-one (9-deaza-2'-deoxyguanosine) was achieved starting from 2-amino-6-methyl-3H-pyrimidin-4-one (5) and methyl 2-deoxy-3,5-di-O-(p-nitrobenzoyl)-D-erythro-pento-furanoside (11). The anomeric configuration of the C-nucleoside was established by 1H NMR, NOEDS and ROESY. This C-nucleoside did not inhibit the growth of T-cell lymphoma cells. 相似文献
20.
Golankiewicz B Januszczyk P Zeidler J Popenda M 《Nucleosides, nucleotides & nucleic acids》2004,23(1-2):127-136
Two new types of imidazole derivatives: N-(2-R1-5-R2-1H-imidazol-4-yl) thioureas 7a-g and N-(2-R1-5-R2-1H-imidazol-4-yl) formamides 8b,c,g were obtained in high yields by the hydrolytic degradation of 6-R1-8-R2-2-thioxo-2,3-dihydroimidazo[1,5-a]-1,3,5-triazin-4(1H)-ones 5a-g and 6-R1-8-R2-imidazo[1,5-a]-1,3,5-triazin-4(3H)-ones 6b,c,d, respectively. The tautomeric preferences of the new imidazoles were determined. 相似文献