2-aminooxyethanol;hydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound was prepared in a similar manner to that described in Example 14 using O-(2-hydroxyethyl)hydroxylamine hydrochloride (93 mg, 0.82 mmol) and 3-[3-(7-formylimidazo[1,2-α]pyridin -3-yl)phenyl]thiophene-2-carbonitrile (67 mg, 0.20 mmol) to afford a white crystalline solid (43 mg, 55%), essentially as a single geometric isomer, m.p. 224-225° C. 1H NMR (360 MHz, CDCl3) δH 3.94-3.97 (2H, m), 4.32-4.36 (2H, m), 7.31-7.38 (2H, m), 7.64-7.72 (5H, m), 7.80 (1H, s), 7.88 (1H, s), 8.17 (1H, s), 8.47 (1H, d, J 7); m/z (ES+) 389 (M++H).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound was prepared in a similar manner to that described in Example 14 using O-(2-hydroxyethyl)hydroxylamine hydrochloride and 3-[3-(pyridin-3-yl)phenyl]imidazo[1,2-α]pyridine-7-carboxaldehyde to afford a white crystalline solid, essentially as a single geometric isomer, m.p. 149-151° C. 1H NMR (400 MHz, CDCl3) δH 2.20 (1H, br s), 3.93-3.97 (2H, m), 4.32-4.36 (2H, m), 7.28 (1H, dd, J 2 and 7), 7.37-7.44 (1H, m), 7.58-7.68 (4H, m), 7.75 (1H, s), 7.80 (1H, s), 7.90-7.95 (1H, m), 8.17 (1H, s), 8.31 (1H, d, J 7), 8.63-8.67 (1H, m), 8.90 (1H, s); m/z (ES+) 359 (M++H). to afford a white crystalline solid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 1-(7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl)ethanone (40 mg, 0.13 mmol), 2-(aminooxy)ethanol hydrochloride (30 mg, 0.26 mmol) and HCl (4 N in 1,4-dioxane, 0.1 mL) in methanol (5 mL) was stirred at room temperature for 48 h. The reaction mixture was neutralized with saturated aqueous NaHCO3 solution and diluted with water, extracted with dichloromethane, dried over Na2SO4. The solvent was removed in vacuo and the residue was purified by flash chromatography in silica gel eluting with a ethyl acetate/methanol gradient to afford 35 mg (74%) of the title compound as yellow solid. 1H-NMR (400 MHz, d6-DMSO) δ ppm 8.94 (s, 1H), 8.84 (d, 1H), 8.28 (d, 1H), 7.97-7.91 (m, 3H), 7.77 (d, 1H), 7.49 (dd, 1H), 4.77 (t, 1H), 4.56 (s, 2H), 4.30-4.27 (m, 2H), 3.71-3.70 (m, 2H), 2.25 (s, 3H). LCMS (method B): [MH]+=363, IR=2.08 min. extracted with dichloromethane dried over Na2SO4 The solvent was removed in vacuo the residue was purified by flash chromatography in silica gel eluting with a ethyl acetate/methanol gradient

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(1-(1-(5,7-difluoroquinolin-6-yl)ethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)ethanone (76.5 mg, 0.22 mmol) in MeOH (50 mL) was added 2-(aminooxy)ethanol hydrochloride (49.0 mg, 0.43 mol). The mixture was heated at 45° C. overnight. The solvent was removed under reduced pressure. The residue was purified by column chromatography with gradient (DCM/MeOH=10:1) to give the title compound as a white solid (58.0 mg, 62%). 1H-NMR (400 MHz, DMSO-d6) δ ppm 9.23 (s, 1H), 9.01 (dd, 1H), 8.52 (d, 1H), 7.74 (d, 1H), 7.63 (dd, 1H), 6.80 (q, 1H), 4.74 (t, 1H), 4.27 (t, 2H), 3.68 (m, 2H), 2.36 (d, 3H), 2.10 (s, 3H). LCMS (method A): [MH]+=414, tR=5.44 min. The solvent was removed under reduced pressure The residue was purified by column chromatography with gradient (DCM/MeOH=10:1)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(1-((5,7-difluoroquinolin-6-yl)methyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)ethanone (3.5 mg, 0.01 mmol) in MeOH (1 mL), 2-(aminooxy)ethanol hydrochloride (intermediate S) (1.6 mg, 0.02 mmol) was added, the solution was heated to 50° C. for overnight. The solvent was removed in vacuo. The residue was diluted with water, treated with aqueous NaHCO3 solution, extracted with DCM. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by prepared HPLC to give white solid (E)-1-(1-((5,7-difluoroquinolin-6-yl)methyl)-1H-[1,2,3]triazolo[4,5-b]pyrazin-6-yl)ethanone O-2-hydroxyethyl oxime (2.4 mg, 56%). 1H-NMR (400 MHz, CDCl3) δ ppm 9.38 (s, 1H), 8.98 (d, 1H), 8.42 (d, 1H), 7.64 (d, 1H), 7.48 (m, 1H), 6.18 (s, 2H), 4.45 (m, 2H), 3.98 (m, 2H), 2.36 (s, 3H), 1.96 (m, 1H). LCMS (method B): [MH]+=399.9, tR=2.19 min. The solvent was removed in vacuo The residue was diluted with water treated with aqueous NaHCO3 solution extracted with DCM The organic layer was dried over Na2SO4 filtered concentrated in vacuo The crude product was purified by prepared HPLC

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 1-(3-(1-(quinolin-6-yl)cyclopropyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)ethanone (30 mg, 0.09 mmol) (59.4) and 2-aminooxy-ethanol hydrochloride (intermediate S) (14 mg, 0.18 mmol) in 4 mL of DCM and 0.5 mL of acetic acid was stirred at 40° C. overnight. The solvent was removed under reduced pressure and the residue was purified by flash chromatography on silica gel eluting with a EtOAc/methanol gradient to afford the title compound. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.84 (t, 1H), 8.30 (d, 1H), 8.25 (d, 1H), 7.93-7.91 (m, 2H), 7.71-7.68 (m, 2H), 7.51 (dd, 1H), 4.73 (t, 1H), 4.23 (t, 2H), 3.65 (q, 2H), 2.02 (s, 3H), 1.78-1.75 (m, 2H), 1.68-1.64 (m, 2H). LCMS (method A): [MH]+=389, tR=4.55 min. The solvent was removed under reduced pressure the residue was purified by flash chromatography on silica gel eluting with a EtOAc/methanol gradient

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 1-{3-[1-(5,7-difluoro-quinolin-6-yl)-ethyl]-[1,2,4]triazolo[4,3-b]pyridazin-6-yl}-ethanone (4.2 g, 11.9 mmol) in methanol (250 mL) was added 2-(aminooxy)ethanol hydrochloride (intermediate S) (2.70 g, 23.8 mmol). The mixture was stirred at rt overnight. LC-MS showed the reaction was complete. An aqueous 1N NaOH solution was added slowly until pH 8-9. The mixture was concentrated, extracted with EtOAc, washed with water and brine. The organic layer was dried over anhydrous Na2SO4, filtered, concentrated, and purified by gradient column chromatography (EtOAc:hexane=2:1, then 100% EtOAc, and then MeOH:EtOAc=1:12 as eluent) to afford 4.8 g (98%) of the title compound as a white solid. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.97 (dd, 1H), 8.44 (m, 1H), 8.25 (d, 1H), 7.64-7.70 (m, 2H), 7.59 (dd, 1H), 5.25 (q, 1H), 4.70 (t, 1H), 4.19 (t, 2H), 3.62 (dd, 2H), 2.02 (d, 3H), 1.88 (s, 3H). LCMS (method A): [MH]+=413, tR=5.09 min. The mixture was concentrated extracted with EtOAc washed with water and brine The organic layer was dried over anhydrous Na2SO4 filtered concentrated purified by gradient column chromatography (EtOAc

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(3-((6-fluoro-1-methyl-1H-indazol-5-yl)methyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (50 mg, 0.155 mmol) in methanol (7 mL) was added 2-(aminooxy)ethanol hydrochloride (17.6 mg, 0.155 mmol). Triethyl amine was added dropwise to adjust the pH to 5˜6. The reaction mixture was stirred at 30° C. for 20 h. The solvent was removed in vacuo and the residue was dissolved in DCM, washed with NaHCO3 (aq) and brine. The organic layer was dried over Na2SO4 and concentrated in vacuo to afford the crude product which was purified by column chromatography to afford 43 mg (70%) of the title compound. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.05 (d, 1H), 7.97 (s, 1H), 7.70 (d, 1H), 7.63 (d, 1H), 7.62 (s, 1H), 7.53 (d, 1H), 4.75 (t, 1H), 4.43 (s, 1H), 4.23 (t, 2H), 3.97 (s, 3H), 3.68 (q, 2H), 2.28 (s, 3H). LCMS (method B): [MH]+=383, tR=2.45 min. The solvent was removed in vacuo the residue was dissolved in DCM washed with NaHCO3 (aq) and brine The organic layer was dried over Na2SO4 concentrated in vacuo to afford the crude product which was purified by column chromatography

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-(3-(1-(6-fluoro-1-methyl-1H-indazol-5-yl)ethyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (100 mg, 0.267 mmol) in methanol (10 mL) was added 2-(aminooxy)ethanol hydrochloride (30.3 mg, 0.267 mmol). Triethyl amine was added dropwise to adjust the pH to 5˜6. The reaction mixture was stirred at 30° C. for 20 h. The solvent was removed in vacuo and the residue was dissolved in DCM, washed with NaHCO3 (aq) and brine. The organic layer was dried over Na2SO4 and concentrated in vacuo to afford the crude product which was purified by chromatography on silica gel to afford 19 mg (17%) of the title compound. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.01 (d, 1H), 7.91 (s, 1H), 7.77 (s, 1H), 7.58 (d, 1H), 7.50 (s, 1H), 7.49 (d, 1H), 4.91 (q, 1H), 4.76 (t, 1H), 4.20 (t, 2H), 3.95 (s, 3H), 3.65 (m, 2H), 2.13 (s, 3H), 1.76 (d, 3H). LCMS (method B): [MH]+=397, tR=2.50 min. Chiral separation (method K) provided enantiomeric pure compounds example 39-R and example 39-S. The solvent was removed in vacuo the residue was dissolved in DCM washed with NaHCO3 (aq) and brine The organic layer was dried over Na2SO4 concentrated in vacuo to afford the crude product which was purified by chromatography on silica gel

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound was prepared from 1-(quinolin-6-ylmethyl)-1H-[1,2,3]triazolo[4,5-b]pyrazine-6-carbaldehyde and 2-(aminooxy)ethanol hydrochloride in 45% yield using the same procedure as described in the synthesis of example 22. 1H-NMR (400 MHz, CD3OD), ppm 9.27 (s, 1H), 8.84 (m, 1H), 8.36 (s, 1H), 8.34 (d, 1H), 8.01 (d, 1H), 8.00 (s, 1H), 7.85 (d, 1H), 7.53 (dd, 1H), 6.20 (s, 2H), 4.39 (t, 2H), 3.87 (t, 2H). LCMS (method B): [MH]+=350, tR=1.94 min. as described in the synthesis of example 22

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-[3-(7-fluoro-quinolin-6-ylmethyl)-3H-[1,2,3]triazolo[4,5-b]pyrazin-5-yl]-ethanone (190.0 mg, 0.59 mmol) in MeOH (40 mL) was added 2-(aminooxy)ethanol hydrochloride (134.0 mg, 1.18 mol). The mixture was heated at 45° C. overnight. The solvent was removed under reduced pressure. The residue was purified by column chromatography with gradient (DCM:MeOH=10:1) to give the title compound as a white solid (168.0 mg, 71%). 1H-NMR (400 MHz, DMSO-d6) δ ppm 9.30 (s, 1H), 8.93 (d, 1H), 8.41 (d, 1H), 8.19 (d, 1H), 7.83 (d, 1H), 7.54 (dd, 1H), 6.24 (s, 2H), 4.78 (t, 1H), 4.31 (t, 2H), 3.72 (m, 2H), 2.29 (s, 3H). LCMS (method A): [MH]+=382, tR=4.99 min. The solvent was removed under reduced pressure The residue was purified by column chromatography with gradient (DCM:MeOH=10:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound (9.0 mg, 17%, 88% purity) was synthesized from 1-(3-(1-(1-methyl-1H-indazol-5-yl)ethyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (40.0 mg, 0.13 mmol) and 2-(aminooxy)ethanol hydrochloride (19.31 mg, 0.25 mmol) using the same procedure as described in the synthesis of example 13. 1H-NMR (400 MHz, DMSO-d6) δ ppm 7.94 (d, 1H), 7.85 (s, 1H), 7.79 (s, 1H), 7.66 (s, 1H), 7.85 (d, 1H), 7.52 (d, 1H), 7.37 (dd, 1H), 4.72 (t, 2H), 4.21 (t, 2H), 3.97 (s, 3H), 3.66 (q, 1H), 2.20 (s, 3H), 1.78 (d, 3H). LCMS (method A): [MH]+=379, tR=5.25 min. as described in the synthesis of example 13