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Heterocyclic Compounds

a technology of heterocyclic compounds and compounds, applied in the field of heterocyclic compounds, can solve the problems of significantly less potency of -methylhistamine than histamin

Inactive Publication Date: 2007-08-09
JANSSEN PHARMA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, R-α-methylhistamine was significantly less potent than histamine, which was not consistent with the involvement of known H3 receptor subtypes.

Method used

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  • Heterocyclic Compounds
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0108]

(4-Methyl-piperazin-1-yl)-(6H-thieno[2,3-b]pyrrol-5-yl)-methanone

[0109] A. 6H-Thieno[2,3-b]pyrrole-5-carboxylic acid ethyl ester. Thiophene-3-carbaldehyde (2.24 g, 20 mmol) was annulated according to Procedure A to provide the title compound (1.2 g, 31%) as a white solid. TLC (silica, 20% EtOAc / hexanes): Rf=0.50. 1H NMR (CDCl3, 400 MHz): 10.30 (br s, 1H), 7.10 (d, J=1.9 Hz, 1H), 6.96 (d, J=5.4 Hz, 1H), 6.87 (d, J=5.4 Hz, 1H), 4.39 (q, J=7.1 Hz, 2H), 1.38 (t, J=7.1 Hz, 3H).

[0110] B. 6H-Thieno[2,3-b]pyrrole-5-carboxylic acid. 6H-Thieno[2,3-b]pyrrole-5-carboxylic acid ethyl ester (835 mg, 4.3 mmol) was hydrolyzed according to Procedure B to provide the crude acid as a pale-yellow solid. 1H NMR (CD3OD, 400 MHz): 7.02 (s, 1H), 6.96 (s, 1H), 6.95 (s, 1H).

[0111] C. (4-Methyl-piperazin-1-yl)-(6H-thieno[2,3-b]pyrrol-5-yl)-methanone. 6H-Thieno[2,3-b]pyrrole-5-carboxylic acid (60 mg, 0.35 mmol) was coupled with N-methylpiperazine according to Procedure C to provide the title compound ...

example 2

[0112]

(Hexahydro-pyrrolo[1,2-a]pyrazin-2-yl)-(6H-thieno[2,3-b]pyrrol-5-yl)-methanone

[0113] 6H-Thieno[2,3-b]pyrrole-5-carboxylic acid (60 mg, 0.35 mmol) was coupled with octahydro-pyrrolo[1,2-a]pyrazine according to Procedure C to provide the title compound (34 mg, 35%) as a light yellow solid. TLC (silica, 10% MeOH / CH2Cl2): Rf=0.4. MS (electrospray): exact mass calculated for C14H17N3OS, 275.11; m / z found, 276.2 [M+H]+. 1H NMR (CDCl3, 400 MHz): 11.1 (br s, 1H), 6.96 (d, J=5.4 Hz, 1H), 6.87 (d, J=5.4 Hz, 1H), 6.71 (d, J=1.9 Hz, 1H), 4.84 (d, J=12.2 Hz, 1H), 4.70 (d, J=12.2 Hz, 1H), 3.30-2.90 (m, 4H), 2.30-1.40 (m, 7H).

example 3

[0114]

(2-Chloro-6H-thieno[2,3-b]pyrrol-5-yl)-(4-methyl-piperazin-1-yl)-methanone

[0115] A. 2-Chloro-6H-thieno[2,3-b]pyrrole-5-carboxylic acid ethyl ester. A solution of 6H-thieno[2,3-b]pyrrole-5-carboxylic acid ethyl ester (580 mg, 3.0 mmol) in acetic acid (6 mL) and CHCl3 (6 mL) was treated with three portions of N-chlorosuccinimide (total 415 mg, 3.15 mmol) at 0° C. over 2 h. The reaction mixture was slowly warmed to room temperature and stirred overnight. The CHCl3 was then removed, and the residue was basified with 4 N NaOH and extracted with EtOAc. The combined organics were washed with satd aq NaHCO3, dried over Na2SO4, and concentrated. Column chromatography (SiO2, 5-10% EtOAc / hexanes) gave 600 mg (88%) of a white solid. TLC (silica, 20% EtOAc / hexanes): Rf=0.5. 1H NMR (CDCl3, 400 MHz): 10.5 (br s, 1H), 6.97 (d, J=2.0 Hz, 1H), 6.85 (s, 1H), 4.39 (q, J=7.2 Hz, 2H), 1.35 (t, J=7.2 Hz, 3H).

[0116] B. (2-Chloro-6H-thieno[2,3-b]pyrrol-5-yl)-(4-methyl-piperazin-1-yl)-methanone.

[011...

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Abstract

Certain thienopyrrolyl and furanopyrrolyl compounds are disclosed as useful to treat or prevent disorders and conditions mediated by the histamine H4 receptor, including allergic rhinitis.

Description

[0001] This application is a division of U.S. patent application Ser. No. 10 / 656,059, filed Sep. 5, 2003, which in turn claims the benefit of U.S. provisional patent application Ser. No. 60 / 408,723, filed Sep. 6, 2002.FIELD OF THE INVENTION [0002] The invention relates to novel, pharmaceutically active, fused heterocyclic compounds and methods of using them to treat or prevent disorders and conditions mediated by the histamine H4 receptor. BACKGROUND OF THE INVENTION [0003] Histamine was first identified as a hormone (G. Barger and H. H. Dale, J. Physiol. (London) 1910, 41:19-59) and has since been demonstrated to play a major role in a variety of physiological processes, including the inflammatory “triple response” via H1 receptors (A. S. F. Ash and H. O. Schild, Br. J. Pharmac. Chemother. 1966, 27:427-439), gastric acid secretion via H2 receptors (J. W. Black et al., Nature 1972, 236:385-390), and neurotransmitter release in the central nervous system via H3 receptors (J.-M. Arran...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/496C07D491/02A61P43/00C07D491/04C07D495/04C07D519/00
CPCC07D495/04C07D491/04A61P1/04A61P11/06A61P17/00A61P17/06A61P25/00A61P29/00A61P37/00A61P37/08A61P43/00A61P9/10
Inventor CAI, HUICARRUTHERS, NICHOLAS I.DVORAK, CURT A.EDWARDS, JAMES P.KWOK, ANNETTE K.WEI, JIANMEI
Owner JANSSEN PHARMA NV
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