WO2010033941A1 - Substituted imidazo[1,2b]pyridazine compounds as trk kinase inhibitors - Google Patents

Substituted imidazo[1,2b]pyridazine compounds as trk kinase inhibitors Download PDF

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WO2010033941A1
WO2010033941A1 PCT/US2009/057729 US2009057729W WO2010033941A1 WO 2010033941 A1 WO2010033941 A1 WO 2010033941A1 US 2009057729 W US2009057729 W US 2009057729W WO 2010033941 A1 WO2010033941 A1 WO 2010033941A1
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alkyl
ring
optionally substituted
compound
independently selected
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English (en)
French (fr)
Inventor
Steven W. Andrews
Julia Haas
Yutong Jiang
Gan Zhang
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Array Biopharma Inc
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Array Biopharma Inc
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Priority to CA2738026A priority Critical patent/CA2738026C/en
Priority to US13/063,894 priority patent/US8450322B2/en
Priority to ES09792796.6T priority patent/ES2464461T3/es
Priority to DK09792796.6T priority patent/DK2350075T3/da
Priority to PL09792796T priority patent/PL2350075T3/pl
Priority to SI200930929T priority patent/SI2350075T1/sl
Priority to JP2011528046A priority patent/JP5503655B2/ja
Priority to HRP20140481AT priority patent/HRP20140481T1/hr
Priority to RS20140259A priority patent/RS53350B/sr
Application filed by Array Biopharma Inc filed Critical Array Biopharma Inc
Priority to CN200980146463.6A priority patent/CN102224153B/zh
Priority to EP09792796.6A priority patent/EP2350075B1/en
Publication of WO2010033941A1 publication Critical patent/WO2010033941A1/en
Anticipated expiration legal-status Critical
Priority to US13/614,968 priority patent/US9227975B2/en
Priority to SM201400123T priority patent/SMT201400123B/xx
Priority to US14/984,353 priority patent/US10011604B2/en
Priority to US16/025,281 priority patent/US10590139B2/en
Ceased legal-status Critical Current

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    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
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Definitions

  • the present invention relates to novel compounds, to pharmaceutical compositions comprising the compounds, to a process for making the compounds and to the use of the compounds in therapy. More particularly, it relates to certain substituted imidazo[l,2-b]pyridazine compounds which exhibit Trk family protein tyrosine kinase inhibition, and which are useful in the treatment of pain, inflammation, cancer and certain infectious diseases.
  • TrkA/NGF pathway antibodies for example, RN-624.
  • RN-624 antagonistic TrkA/NGF pathway antibodies
  • Bone metastases are a frequent complication of cancer, occurring in up to 70 percent of patients with advanced breast or prostate cancer(l) and in approximately 15 to 30 percent of patients with carcinoma of the lung, colon, stomach, bladder, uterus, rectum, thyroid, or kidney. Osteolytic metastases can cause severe pain, pathologic fractures, life- threatening hypercalcemia, spinal cord compression, and other nerve-compression syndromes. For these reasons, bone metastasis is a serious and costly complication of cancer. Therefore, agents that can induce apoptosis of proliferating osteoblasts would be highly advantageous. Expression of TrkA and TrkC receptors has been observed in the bone forming area in mouse models of bone fracture (K.
  • U.S. Patent Publication number 2007/025540 discloses certain substituted imidazo[l,2b]pyridazines having a secondary amino group or a BOC-protected piperazinyl group at the 6-position. These compounds are disclosed as being inhibitors of the protein kinase C (PKC).
  • PKC protein kinase C
  • R b is H or (l-6C alkyl);
  • hetCyc 1 is a carbon-linked 4-6 membered azacyclic ring optionally substituted with one or more substituents independently selected from (1-4C alkyl), CO 2 H and CO 2 (I -4C alkyl);
  • R 1 is hydrogen
  • R 2 is selected from (l-4C)alkyl, (l-4C)fiuoroalkyl, CF 3 , -(l-4C)hydroxyalkyl, (1-4C alkyl)hetAr ⁇ and -(1-4C alkyl)NH(l-4C alkyl).
  • R 2 is -(1-4C alkyl)NH(l-4C alkyl).
  • Examples include groups having the formula (1-4C alkyl)NHCH 3 .
  • a particular value include -
  • R 2 is hetAr 2 .
  • hetAr 2 include pyridyl, pyrimidyl, pyrazinyl, pyrazolyl, imidazolyl and thiazolyl rings optionally substituted with one or more substituents independently selected from (1-4C alkyl), halogen, -0(1 -4C alkyl), and NH(1-4C alkyl).
  • substituents for hetAr 2 include methyl, ethyl, chloro, OMe, and NHCH(CH 3 ) 2 .
  • Particular values of R 2 include the structures:
  • R 2 is hetCyc 1 .
  • hetCyc 1 include carbon- linked azetidinyl, pyrrolidinyl and piperidinyl rings optionally substituted with one or more substituents independently selected from (1-4C alkyl), CO 2 H and CO 2 (I -4C alkyl).
  • substituents include methyl, ethyl, propyl, CO 2 H, CO 2 Me, CO 2 Et, and CO 2 C(CH 3 ) 3 .
  • hetCyc 1 is optionally substituted with one or two of said substituents.
  • Particular values for R 2 represented by hetCyc 1 include the structures:
  • R 2 (I -4C alkyl) group such a methanesulfonamido or an ethanesulfonamido group.
  • R 2 include the structures:
  • R 4 is (l-4C)alkyl, such as methyl, ethyl, propyl, isopropyl, or butyl.
  • a particular example is methyl.
  • R 4 is (1-4 Qalkoxy, for example OMe and OEt.
  • R 4 is NH 2 .
  • R 4 is CH 2 OH.
  • X is null, such that the heterocyclic ring at the 6-position of Formula I has the structure:
  • X is -CH 2 NR d -, such that the heterocyclic ring at the 6- position of Formula I has the structure:
  • R 2 is NR b R c ;
  • NR b R c forms a 4 membered heterocyclic ring having a ring nitrogen atom, wherein said ring is optionally substituted with one or more substituents independently selected from halogen, OH, (1-4C alkyl), (1-4
  • each R 4 is independently selected from halogen, (l-4C)alkyl, OH, (1-4
  • n 0, 1, or 2.
  • Y is phenyl optionally substituted with one or more substituents independently selected from halogen, (l-4C)alkoxy, CF 3 and CHF 2 ;
  • Z is a leaving atom or group such as a halogen (for example Cl), with a corresponding compound having the formula V
  • Compounds of Formula I are also useful for treating inflammation and certain infectious diseases.
  • Compounds of Formula I may also be used to treat demyelination and dysmyelination by promoting myelination, neuronal survival, and oligodendrocyte differentiation via blocking Sp35-TrkA interaction.
  • Trk enzymatic selectivity was assessed using OmniaTM Kinase Assay reagents from Invitrogen Corp. Enzyme (either TrkA or TrkB from Invitrogen Corp.) and test compound (various concentrations) were incubated for 10 minutes at ambient temperature in a 384-well white polypropylene plate (Nunc catalog # 267462). Omnia Tyr Peptide #4 (for TrkA) or #5 (for TrkB), as well as ATP, were then added to the plate. Final concentrations were as follows: 20 nM enzyme, 500 ⁇ M of ATP for TrkA assay or 1 mM ATP for TrkB assay, 10 ⁇ M peptide substrate.
  • the assay buffer consisted of 25 mM MOPS pH 7.5, 0.005% (v/v) Triton X-100 and 5 mM MgCl 2 .
  • compounds of the invention had an average IC 50 below 1000 nM. Certain compounds had an average IC50 below 100 nM.
  • Step A Preparation of (RVtert-butyl 2-(2.5-difluorophenyr)pyrrolidine-l- carboxylate: A solution of tert-butyl pyrrolidine- 1-carboxylate (20 g, 116.8 mmol) and (- )sparteine (32.9, 140 mmol) in MTBE (360 mL) was cooled to -78 0 C, and sec-BuLi (10OmL, 140 mmol, 1.4 M in cyclohexane) was introduced drop-wise via cannula, keeping the internal temperature under -70 0 C.
  • a 1 : 1 racemic sample was prepared according the same procedure described herein, replacing (R)-2-(2,5- difluorophenyl)pyrrolidine with (rac)-2-(2,5-difluorophenyl)pyrrolidine.
  • the ee% of the product obtained as described above was determined to be > 93%.
  • Step 2 Preparation of (RV6-(2-(2.5-difluo ⁇ )phenyl > )pyrrolidin-l-ylV3- nitroimidazo
  • 1 ,2-blpyridazine A suspension of 6-chloro-3-nitroimidazo[l,2-b]pyridazine (1.0 g, 5.0 mmol) and (R)-2-(2,5-difluorophenyl)pyrrolidine (Prepared as described in Preparation A; 1.9 g, 11 mmol) in n-butanol (4.6 mL, 50 mmol) was sealed in a pressure reaction tube and stirred in a 140 0 C oil bath overnight.
  • reaction mixture was cooled in an ice bath for 10 minutes before DIEA (0.05 mL, 0.29 mmol) was added dropwise. After addition, reaction was warmed to ambient temperature and stirred overnight. The reaction mixture was diluted with EtOAc (20 mL), washed with water and brine (10 mL each), and concentrated. The crude material was purified by reverse-phase column chromatography, eluting with 5 to 60% acetonitrile/water to yield (R)-N-(6-(2-(2,5- difluorophenyl)pyrrolidin- 1 -yl)imidazo [ 1 ,2-b]pyridazin-3 -yl)-4-
  • the reaction mixture was then sealed and stirred at 180 0 C for 24 hours. After completion, the reaction was cooled to ambient temperature, and diluted with water and EtOAc. The organic layer was separated, and the aqueous layer was extracted with EtOAc twice. The combined organic layers was dried over Na 2 SO 4 and concentrated. The crude product was purified by silica column chromatography, eluting with 20 to 50% EtOAc in hexanes to yield the desired product for the next step.
  • Step 2 Preparation of 6-(2-(3-fluorophenyl)piperidin-l-yl)imidazori,2- blpyridazin-3 -amine: A mixture of 6-(2-(3-fluorophenyl)piperidin-l-yl)-3-nitroimidazo[l,2- b]pyridazine (50 mg, 0.146 mmol) and SnCl 2 dihydrate (165 mg, 0.732 mmol) in 5 mL EtOH was first stirred at 70 0 C for 30 minutes, then cooled to ambient temperature and concentrated.

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PCT/US2009/057729 2008-09-22 2009-09-21 Substituted imidazo[1,2b]pyridazine compounds as trk kinase inhibitors Ceased WO2010033941A1 (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
RS20140259A RS53350B (sr) 2008-09-22 2009-09-21 Supstituisana jedinjenja imidazo[1,2-b]piridazina kao inhibitori trk kinaze
ES09792796.6T ES2464461T3 (es) 2008-09-22 2009-09-21 Compuestos de imidazo[1,2B]piridazina sustituidos como inhibidores de la TRK cinasa
CN200980146463.6A CN102224153B (zh) 2008-09-22 2009-09-21 作为trk激酶抑制剂的取代的咪唑并[1，2-b]哒嗪化合物
PL09792796T PL2350075T3 (pl) 2008-09-22 2009-09-21 Podstawione związki imidazo[1,2b]pirydazynowe jako inhibitory kinaz Trk
SI200930929T SI2350075T1 (sl) 2008-09-22 2009-09-21 Substituirane imidazo (1,2b)piridazinske spojine kot Trk kinazni inhibitorji
JP2011528046A JP5503655B2 (ja) 2008-09-22 2009-09-21 Ｔｒｋキナーゼ阻害剤としての置換イミダゾ［１，２ｂ］ピリダジン化合物
HRP20140481AT HRP20140481T1 (hr) 2008-09-22 2009-09-21 SUPSTITUIRANI SPOJEVI IMIDAZO[1,2-b]PIRIDAZINA KAO INHIBITORI TRK KINAZE
CA2738026A CA2738026C (en) 2008-09-22 2009-09-21 Substituted imidazo[1,2b]pyridazine compounds as trk kinase inhibitors
DK09792796.6T DK2350075T3 (da) 2008-09-22 2009-09-21 Substituerede imidazo[1,2b]pyridazinforbindelser som trk-kinase-inhibitorer
US13/063,894 US8450322B2 (en) 2008-09-22 2009-09-21 Substituted imidazo[1,2b]pyridazine compounds as Trk kinase inhibitors
EP09792796.6A EP2350075B1 (en) 2008-09-22 2009-09-21 Substituted imidazo[1,2b]pyridazine compounds as trk kinase inhibitors
US13/614,968 US9227975B2 (en) 2008-09-22 2012-09-13 Method of treatment using substituted imidazo[1,2B]pyridazine compounds
SM201400123T SMT201400123B (it) 2008-09-22 2014-09-04 Imidazo[1,2B]piridazine sostituite come inibitori di trk-chinasi
US14/984,353 US10011604B2 (en) 2008-09-22 2015-12-30 Method of treatment using substituted imidazo[1,2b]pyridazine compounds
US16/025,281 US10590139B2 (en) 2008-09-22 2018-07-02 Method of treatment using substituted imidazo[1,2b]pyridazine compounds

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