- Novel fused pyrrole heterocyclic ring systems as structure analogs of LE 300: Synthesis and pharmacological evaluation as serotonin 5-HT2A, dopamine and histamine H1 receptor ligands
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LE 300 represents a structurally novel type of antagonists acting preferentially at the dopamine D1/D5 receptors and the serotonin 5-HT2A receptor. This compound consists of a ten-membered central azecine ring fused to an indole ring on one side and a benzene moiety on the other side. To estimate the importance of the indole and / or phenyl moieties in this highly active benzindolo-azecine, both rings were removed and replaced with a 1H-pyrrole counterpart. Accordingly, some new analogs of LE 300 namely, pyrrolo[2,3-g]indolizine, pyrrolo[3,2-a]quinolizine rings and their corresponding dimethylpyrrolo[2,3-d]azonine, and dimethylpyrrolo[2,3-d]azecine were synthesized to be evaluated for their activity at the 5-HT2A and dopamine D1, D2L, D4, D5 receptors in relation to LE 300. In addition, their activity at the H1-histamine receptors was also determined. The results suggested that the rigid pyrrolo[2,3-g] indolizine 7 and pyrrolo[3,2-a]quinolizine 8 analogs lacked biological activity in the adopted three bioassays. However, their corresponding flexible pyrrolo[2,3-d]azonine 11 and pyrrolo[2,3-d]azecine 12 derivatives revealed weak partial agonistic activity and weak antagonistic potency at the serotonin 5-HT2A and histamine H1 receptors, respectively. Meanwhile, they showed no affinity to any of the four utilized dopamine receptors. Variation in ring size did not contribute to a significant influence on the three tested bioactivities. Removal of the hydrophobic moiety (phenyl ring) and replacement of the indole moiety with a 1H-pyrrole counterpart led to a dramatic alteration in the profile of activity of such azecine-type compounds.
- Rostom, Sherif A. F.
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Read Online
- Compound as potassium channel modulator
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The invention relates to a compound as a potassium channel modulator, which is a compound of a formula (I) or a pharmaceutically acceptable salt thereof. The compound or the pharmaceutically acceptable salt thereof is effective for curing and preventing diseases and symptoms influenced by the activity of potassium ion channels.
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Paragraph 0211; 0749; 0751; 0752; 0753
(2018/07/30)
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- Diastereodivergent pictet-spengler cyclization of bicyclic N-acyliminium ions: Controlling a quaternary stereocenter
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The diastereoselectivity of the Pictet-Spengler cyclization of bicyclic N-acyliminium ions that contain a 3-azabicyclo-[n.3.0]alkane core and an electron-rich ?-nucleophilic moiety, such as an indol-2-yl, indol-3-yl, 1-methylpyrrol-2-yl, or 3,5-dimethoxyphenyl group, was examined. The N-acyliminium ions were generated by protonation of the corresponding enamides or hemiaminals, which were derived from imides. Control of the quaternary stereocenter created at the newly formed ring junction was achieved in a diastereodivergent manner by fine-tuning the reaction conditions, which determined whether the reaction proceeded under kinetic or thermodynamic control. Mechanistic studies indicated that a retro-Pictet-Spengler reaction pathway is involved in the equilibration process.
- De Carn-Carnavalet, Benot,Krieger, Jean-Philippe,Follas, Benot,Brayer, Jean-Louis,Demoute, Jean-Pierre,Meyer, Christophe,Cossy, Janine
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supporting information
p. 1273 - 1282
(2015/03/04)
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- CINNAMIC ACID AMIDE DERIVATIVE
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The present invention provides a cinnamic acid amide derivative having an excellent analgesic action. The cinnamic acid amide derivative of the present invention is a compound showing excellent analgesic actions to not only a nociceptive pain model animal but also a neuropathic pain model animal, which is very useful as an agent for treating various pain diseases showing acute or chronic pains or neuropathic pains.
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Paragraph 0028; 0036
(2015/11/24)
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- Binding of tetrahydrocarboline derivatives at human 5-HT5A receptors
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On the basis of an earlier finding that 5-methyl-5H-1,2,3,4-tetrahydropyrido[4,3-b]indole (5-methyl-1,2,3,4-tetrahydro-γ-carboline; 1) binds at murine 5-HT 5A receptors, preliminary structure-affinity studies were conducted. The present investigation extends these structure-affinity studies using human 5-HT5A receptors and examined additional analogues of 1. It was found (a) that there is little interspecies difference for the affinities of these compounds, (b) that an intact 1,2,3,4-tetrahydro-γ-carboline ring system seems optimal and an N2-(3-(substituted-phenoxy)propyl) moiety results in high affinity, (c) that structurally related 1,2,3,4-tetrahydro-β-carbolines also bind at 5-HT5A receptors, and (d) that all examined derivatives also possess affinity for 5-HT 2A receptors. Evidence is provided that 5-HT5A and 5-HT2A receptor affinities probably do not covary and that it might be possible, with continued investigation, to develop analogues with enhanced 5-HT5A selectivity.
- Khorana, Nantaka,Smith, Carol,Herrick-Davis, Kathy,Purohit, Anil,Teitler, Milt,Grella, Brian,Dukat, Ma?gorzata,Glennon, Richard A.
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p. 3930 - 3937
(2007/10/03)
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- SUBSTITUTED QUINAZOLINE DERIVATIVES AND THEIR USE AS INHIBITORS
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The use of a compound of formula (I) 1 or a salt, ester or amide thereof; where X is O, or S, S(O) or S(O)2, or NR6 where R6 is hydrogen or C1-6 alkyl,; R5 is an optionally substituted 5-membered heteroaromatic ring, R1, R2 ,R3, R4 are independently selected from various specified moieties, in the preparation of a medicament for use in the inhibition of aurora 2 kinase. Certain compounds are novel and these, together with pharmaceutical compositions containing them are also described and claimed
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- Synthesis and 5-HT2A antagonist activity of derivatives of the novel heterocycles indolo[3,2-d]pyrrolo[3,2-g]azecine and benzo[d]pyrrolo[3,2-g]azecine compared to the benz[d]indolo[2,3-g]azecine derivative LE 300
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An indolo[3,2-d]pyrrolo[3,2-g]azecine and a benzo[d]pyrrolo[3,2-g]azecine analogue of the potent dopamine receptor antagonist LE 300 (7-methyl-6,7,8,9,14,15-hexahydro-5H-benz[d]indolo[2,3-g]azecine) have been prepared in multi-step reactions via C-N bond cleavage of corresponding quaternary N-methylquinolizinium iodides. LE 300, the target compounds and two precursor quinolizines have been tested in vitro for antagonist activity at 5-HT2A receptors (rat tail artery) and H1 receptors (guinea-pig ileum), respectively. LE 300 and compound 19 (3,6-dimethyl-4, 5,6,7,8,13-hexahydro-3H-benzo[d]pyrrolo[3,2-g]azecine) competitively inhibited 5-HT-induced contractions with similar nanomolar potency (pA2 = 8.32 and 8.01, respectively) but were less active than the reference antagonist ketanserin (pA2 = 9.55). Compound 19 displayed moderate H1-antihistaminic activity in the guinea-pig ileum assay (pA2 = 7.37).
- Rostom, Sherif A. F.,Farghaly, Ahmed M.,Soliman, Farid S. G.,El-Semary, Mona M.,Elz, Sigurd,Lehmann, Jochen
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p. 241 - 247
(2007/10/03)
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- Rapid parallel synthesis applied to the optimization of a series of potent nonpeptide neuropeptide Y-1 receptor antagonists
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This study describes the integrated application of parallel synthesis and computational chemistry to the design of potent nonpeptide antagonists for the neuropeptide Y-1 (NPY1) receptor. A lead molecule was modeled in the active site of the NPY1 receptor, and a potentially fruitful region for analog construction was identified. Synthesis of suitable scaffolds followed by solution phase generation of a small library of analogs produced a compound with 5-fold improvement in binding over the already potent lead. This new compound was shown to be an unanticipated side product of the parallel synthesis reaction.
- Siegel, Miles G.,Chaney, Michael O.,Bruns, Robert F.,Clay, Michael P.,Schober, Douglas A.,Van Abbema, Anne M.,Johnson, Douglas W.,Cantrell, Buddy E.,Hahn, Patric J.,Hunden, David C.,Gehlert, Donald R.,Zarrinmayeh, Hamideh,Ornstein, Paul L.,Zimmerman, Dennis M.,Koppel, Gary A.
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p. 11619 - 11639
(2007/10/03)
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- 4-Substituted-1-methyl-1H-pyrrolopyridines
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The synthesis of a series of 4-substituted 1-methyl-1H-pyrrolopyridines is described based on transformations of 4-methyl and 4-chloro analogues.Reactivities of the latter compounds proved less than those of corresponding α-substituted pyridines, but pressure methods allowed isolation of the 4-amino and other amine derivatives in good yield.Under Mannich conditions both 4-methyl and 4-chloro derivatives were converted to bis methanes.
- Casy, Alan F.,Needle, Richard J.,Upton, Christopher
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p. 343 - 360
(2007/10/02)
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