Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C335/00—Thioureas, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
  • C07C335/04—Derivatives of thiourea
  • C07C335/16—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
  • C07C335/18—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton being further substituted by singly-bound oxygen atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/04—Centrally acting analgesics, e.g. opioids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
  • C07C311/30—Sulfonamides, the carbon skeleton of the acid part being further substituted by singly-bound nitrogen atoms, not being part of nitro or nitroso groups
  • C07C311/45—Sulfonamides, the carbon skeleton of the acid part being further substituted by singly-bound nitrogen atoms, not being part of nitro or nitroso groups at least one of the singly-bound nitrogen atoms being part of any of the groups, X being a hetero atom, Y being any atom, e.g. N-acylaminosulfonamides
  • C07C311/47—Y being a hetero atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C335/00—Thioureas, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
  • C07C335/04—Derivatives of thiourea
  • C07C335/06—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to acyclic carbon atoms
  • C07C335/10—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to acyclic carbon atoms of an unsaturated carbon skeleton
  • C07C335/12—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to acyclic carbon atoms of an unsaturated carbon skeleton the carbon skeleton containing six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C335/00—Thioureas, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
  • C07C335/04—Derivatives of thiourea
  • C07C335/16—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton

Definitions

• the present invention relates to antagonists of the vanilloid receptor, in particular to sulfonamido derivatives that antagonize the TRPVl receptor.
• TRPVl receptor transient receptor potential channel
• the present invention relates to compounds of general formula (I)
• R 1 is hydrogen
• R 2 is benzyl or 2-phenylethyl, in which the aromatic ring is optionally substituted with one or more groups selected from halogen, hydroxy and methoxy;
• R 3 is hydrogen, halogen or an alkoxy group
• R 4 is a -(CH 2 ) n NH- group, in which n ranges from 0 to 3;
• R 5 is S or O
• R 6 is -NHCH 2 -
• R 7 is r-butyl or trifluoromethyl.
• halogen means fluorine, chlorine, bromine or iodine.
• Preferred compounds of formula (I) are those wherein R 5 is S and R 6 is a -NHCH 2 - group, in particular those wherein R 3 is hydrogen and R 7 is selected from 4-f ⁇ butyl or 4-trifuoromethyl.
• a first group of preferred compounds is that wherein R 4 n is O.
• a second group of preferred compounds is that wherein in the group R 4 n is 2; among them, particularly preferred are the compounds in which R 1 is hydrogen and R 2 is benzyl or 2-phenylethyl, optionally substituted as indicated above.
• R 1 is hydrogen
• R 2 is benzyl or 2-phenylethyl, optionally substituted as indicated above.
• R 2 is benzyl or 2-phenylethyl wherein the aromatic ring is substituted
• those in which R 2 is 2-iodo-4- hydroxy-5-methoxy-benzyl are preferred.
• the compounds of formula (I) proved active as inhibitors of the vanilloid TRPVl receptor and can therefore be used for the preparation of pharmaceutical compositions for the therapy of inflammatory states, for example chronic pain and inflammatory hyperalgesia.
• These formulations will be prepared with conventional methods and excipients, such as those described in Remington's Pharmaceutical Sciences Handbook, XVII Ed. Mack Pub., N.Y., U.S.A..
• the compounds of formula (I) can be conveniently prepared according to conventional known techniques, for example by reaction of a sulfonamide of formula (III):
• Reagents (i) Dioxane, TEA, 8O 0 C; (ii) aq. 20% HCl, dioxane; (iii) A- tert-butylbenzyl isothiocyanate or 4-trifluoromethylbenzyl isothiocyanate, ethanol, rfx.
• Reagents (i) 4-acetamidobenzene sulfonyl chloride, dioxane; (ii) aq. 20% NaOH; (iii) 4-t-butylbenzyl isothiocyanate or 4-trifluoromethylbenzyl isothiocyanate.
• R 7 t-butyl, trifluoromethyl.
• Acetic anhydride (1 ml, 10.5 mmol) was added to a solution of 4-hydroxy-3-methoxy-benzylamine hydrochloride (0.5 g, 2.63 mmol) in pyridine (5 ml) and the mixture was stirred at room temperature for 6 hours.
• IPy 2 BF 4 1 ' 2 (0.69 g, 6.9 mmol) in CH 2 Cl 2 (40 ml). The resulting mixture was stirred at room temperature for 5 hours, then added with 10% aq. sodium thiosulfate until it became completely clear. The aqueous layer was extracted with CH 2 Cl 2 (3 x 25 ml) and the organic phases were anhydrified (Na 2 SO 4 ) and evaporated under vacuum. The residue was recrystallized from a mixture
• Bidimensional NOESY (CDCl 3 ): coupling between the singlet at 7.44 ppm and the singlet at 2.33 ppm confirms that iodine is at the 2-position of the aromatic ring.
• N-chlorosuccinimide (3.15 mmol, 0.42 g) was added to a solution of 4-acetyloxy-3-methoxy-N-acetyl-benzylamine of Example 1.1 (0.5 g, 2.1 mmol) in dry DMF (6 ml) and the mixture was stirred for 30' at 0 0 C and then for 16 hours at room temperature.
• Bidimensional NOESY (DMSO-d 6 ): coupling between the singlet at 2.24 ppm and the singlet at 7.25 ppm confirms that chlorine is at the 2-position of the aromatic ring.
• N-bromosuccinimide (3.15 mmol, 0.42 g) was added to a solution of 4-acetyloxy-3-methoxy-N-acetyl-benzylamine of Example 1.1 (0.5 g, 2.1 mmol) in dry DMF (6 ml) and the mixture was stirred for 30' at 0 0 C and then for 16 hours at room temperature. When water was added to the reaction (40 ml) the formation of a white precipitate was observed.
• Bidimensional NOESY (DMSO-d 6 ): coupling between the singlet at 2.49 ppm and the singlet at 7.39 ppm confirms that bromine is at the 2-position of the aromatic ring.
• mice Male Sprague-Dawley rats with body weight between 250 to 350 g at the time for testing were used.
• rats were sacrificed by decapitation under anesthesia and spinal cord was removed and disrupted using a Polytron tissue homogenizer in ice cold buffer containing 5 mM KCl, 5.8 mM NaCl, 0.75 mM CaCl 2 , 2 mM MgCl 2 , 320 mM sucrose, 10 mM Hepes, pH 8.6 (Szallasi and Blunberg, 1992; 1993).
• Tissue homogenized was centrifuged at 1000 xg for 10 min at 4°C and the suraatant was centrifuged again at 35000 xg for 30 min at 4 0 C (Beckman Avanti J25). The pellet was resuspended in the same buffer as described above and used in binding experiments.
• 150 ⁇ g protein/sample from membrane suspensions were incubated with ([ 3 H]-Resiniferatoxin, Perkin Elmer, Boston, MA) [ 3 H]-RTX (0.003-3 iiM) in the assay buffer containing 0.25 mg/ml fatty acid-free bovine serum albumin at 37°C for 60 min.
• PBS cold phosphate buffered solution
• ganglia were rinsed three times with Ca 2+ -Mg 2+ -free PBS and then placed in 2 ml of cold DMEM supplemented with 10% foetal bovine serum (FBS, heat inactivated), 2 mM L-glutamine, 100 u/ml penicillin and 100 mg/ml streptomycin.
• FBS foetal bovine serum
• 2 mM L-glutamine 100 u/ml penicillin and 100 mg/ml streptomycin.
• the ganglia were then dissociated into single cells by several passages through a series of syringe needles (23G down to 25G).
• the complex of medium and ganglia cells were sieved through a 40 mm filter to remove debris and topped up with 8 ml of DMEM medium and centrifuged (200 x g for 5 min).
• the final cell pellet was re-suspended in DMEM medium (supplemented with 100 ng/ml mouse Nerve Growth Factor (mouse-NGF-7S) and cytosine-b-D-arabino-furanoside free base (ARA-C) 2.5 mM).
• DMEM medium supplied with 100 ng/ml mouse Nerve Growth Factor (mouse-NGF-7S) and cytosine-b-D-arabino-furanoside free base (ARA-C) 2.5 mM.
• Cells were plated on poly-L-lysine (8.3 mM) and laminin (5 mM) coated 25 mm glass cover slips and kept for 2 to 5 days at 37 0 C in a humidified incubator gassed with 5% CO 2 and air.
• Plated neurons were loaded with Fura-2-AM-ester (3 ⁇ M) in Ca 2+ buffer solution of the following composition (mM): CaCl 2 1.4, KCl 5.4, MgSO 4 0.4, NaCl 135, D- glucose 5, HEPES 10 with BSA 0.1%, at pH 7.4, for 40 min at 37 0 C, washed twice with the Ca 2+ buffer solution and transferred to a chamber on the stage of Nikon eclipse TE300 microscope. The dye was excited at 340 and 380 nm to indicate relative [Ca 2+ Jj changes by the F 340 ZF 380 ratio recorded with a dynamic image analysis system (Laboratory Automation 2.0, RCS, Florence, Italy).
• Capsaicin (0.1 ⁇ M) and ionomycin (5 ⁇ M) were added to the chamber.
• a calibration curve using a buffer containing Fura-2-AM-ester and determinant concentrations of free Ca 2+ was used to convert the data obtained from F 340 ZF 380 ratio to [Ca 2+ Jj (nM).
• the irritant effect (induction of wiping movements) of capsaicin was assessed by applying capsaicin 3 ⁇ g/eye (10 ⁇ l) on the rat conjunctiva and the number of wiping movements was recorded during the 60 sec period that followed the application.
• rats were treated intraperitoneally with diverse doses of 14 and capsaicin-induced wiping was studied.
• Drugs and solubility Drugs and reagents were obtained from the indicated companies: capsaicin, ionomycin, laminin, poly-L-lysine and capsazepine (Sigma, Italy); mouse NGF-7S and collagenase/dispase (Roche Diagnostics, Italy);
• Dulbecco's Modified Eagle's medium DMEM
• foetal bovine serum FBS
• penicillin/streptomycin 10,000 IU/ml ⁇ 10,000 UG/ml
• Ca 2+ -Mg 2+ -free phosphate buffered solution PBS
• Capsaicin (0.1 ⁇ M) caused an increase in [Ca ]j in the vast majority (87%) of rat trigeminal neuronal cells, that therefore were identified as TRPVl expressing neurons.
• IC 50 values of all the compounds please referrer to table 1. Data are expressed as Mean and 95% fiducial limits.
• Affinity (Ki) and potency (IC 50 ) values were obtained by using [ 3 H]-RTX competition binding assays and intracellular calcium assay in cultured rat trigeminal neurons. NT: not tested. Wiping test in rats
• Intraperitoneal compound 14 60 minutes prior to the capsaicin challenge, caused a dose dependent reduction of the capsaicin-induced wiping behaviour in rats (the dose of 1 mg/kg produced a 24% of inhibition).
• 14 was able to inhibit TRPVl -dependent responses with an affinity that was significantly greater than that of the classic TRPVl receptor antagonist, capsazepine.
• the compounds 19 and 20 did demonstrate high affinity for the TRPVl receptor in vitro. All the compounds mentioned above may be an important tool for future studies in pain and neurogenic inflammatory models.

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• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

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• 2004
  • 2004-10-26 IT IT002042A patent/ITMI20042042A1/it unknown
• 2005
  • 2005-10-18 ES ES05796943T patent/ES2303275T3/es not_active Expired - Lifetime
  • 2005-10-18 US US11/577,857 patent/US7579378B2/en not_active Expired - Fee Related
  • 2005-10-18 AT AT05796943T patent/ATE389634T1/de not_active IP Right Cessation
  • 2005-10-18 DE DE602005005512T patent/DE602005005512T2/de not_active Expired - Lifetime
  • 2005-10-18 EP EP05796943A patent/EP1805138B1/en not_active Expired - Lifetime
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  • 2005-10-18 WO PCT/EP2005/011206 patent/WO2006045498A1/en not_active Ceased

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