[(2S)-oxolan-2-yl]methanol

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

Procedure: To a solution of (S)-tetrahydrofurfuryl alcohol (Codexis, 1.6 g, 15.2 mmol) in 5 mL of CH2Cl2 and 5 mL of pyridine was added p-toluenesulfonyl chloride (4.3 g, 22.8 mmol) in portions over 15 minutes. The mixture stirred at ambient temperature for 3 hours and was quenched with 10 mL of saturated, aqueous NaHCO3. The layers were separated and the aqueous layer was extracted with three 5 mL portions of CH2Cl2. The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to afford the title compound. MS (DCI/NH3) m/z 257 (M+H)+, 274 (M+NH4)+. was quenched with 10 mL of saturated, aqueous NaHCO3 The layers were separated the aqueous layer was extracted with three 5 mL portions of CH2Cl2 The combined organic extracts were dried over anhydrous Na2SO4 filtered concentrated under reduced pressure

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

Procedure: To (S)-(tetrahydrofuran-2-yl)methanol (2.0 g, 20 mmol) in CH2Cl2 (10 mL) at about 0° C. was added p-toluenesulfonyl chloride (4.2 g, 22.00 mmol), followed by drop-wise addition of triethylamine (5.6 mL, 40.0 mmol). The resulting solution was kept at 0° C. for 2 hours, and then at room temperature for another 2 hours. The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added. The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated to yield the title compound (2.3 g, 13.00 mmol, 64%) as a colorless oil, which was used in the next step without purification. at room temperature for another 2 hours The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added The organic layer was separated dried over magnesium sulfate filtered concentrated

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

Procedure: To (S)-(tetrahydrofuran-2-yl)methanol (2.0 g, 20 mmol) in CH2Cl2 (10 mL) at about 0° C. was added p-toluenesulfonyl chloride (4.2 g, 22.00 mmol), followed by drop-wise addition of triethylamine (5.6 mL, 40.0 mmol). The resulting solution was kept at 0° C. for 2 hours, and then at room temperature for another 2 hours. The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added. The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated to yield the title compound (2.3 g, 13.00 mmol, 64%) as a colorless oil, which was used in the next step without purification. at room temperature for another 2 hours The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added The organic layer was separated dried over magnesium sulfate filtered concentrated

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

Procedure: To (S)-(tetrahydrofuran-2-yl)methanol (2.0 g, 20 mmol) in CH2Cl2 (10 mL) at about 0° C. was added p-toluenesulfonyl chloride (4.2 g, 22.00 mmol), followed by drop-wise addition of triethylamine (5.6 mL, 40.0 mmol). The resulting solution was kept at 0° C. for 2 hours, and then at room temperature for another 2 hours. The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added. The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated to yield the title compound (2.3 g, 13.00 mmol, 64%) as a colorless oil, which was used in the next step without purification. at room temperature for another 2 hours The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added The organic layer was separated dried over magnesium sulfate filtered concentrated

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

Procedure: To a solution of (S)-1-(tetrahydrofuran-2-yl)methanol (7.95 g) in pyridine (35 ml) was added, at −15° C., methanesulfonyl chloride (7.47 g), and the reaction was stirred at 0° C. for 5 hours. After the addition of water, the mixture was extracted with ethyl acetate. The organic phases were dried over magnesium sulfate and concentrated. The product was thus obtained with the molecular weight of 180.22 (C6H12O4S); MS (ESI): 181 (M+H+). Analogously, methanesulfonic acid (R)-1-(tetrahydrofuran-2-yl)methyl ester was synthesized. the mixture was extracted with ethyl acetate The organic phases were dried over magnesium sulfate concentrated The product was thus obtained with the molecular weight of 180.22 (C6H12O4S)

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

Procedure: To (S)-(tetrahydrofuran-2-yl)methanol (2.0 g, 20 mmol) in CH2Cl2 (10 mL) at about 0° C. was added p-toluenesulfonyl chloride (4.2 g, 22.00 mmol), followed by drop-wise addition of triethylamine (5.6 mL, 40.0 mmol). The resulting solution was kept at 0° C. for 2 hours, and then at room temperature for another 2 hours. The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added. The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated to yield the title compound (2.3 g, 13.00 mmol, 64%) as a colorless oil, which was used in the next step without purification. at room temperature for another 2 hours The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added The organic layer was separated dried over magnesium sulfate filtered concentrated

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

Procedure: To a solution of (S)-(tetrahydrofuran-2-yl-)-methanol (30.6 mg) in dry DMF (1 mL) NaH (12 mg, 60% dispersion in mineral oil) was added, and the mixture was stirred at room temperature for 20 minutes under nitrogen. To this mixture 6-chloro-imidazo[1,2-b]pyridazine-2-carboxylic acid [5-(3-chloro-5-fluoro-phenyl)-1H-benzoimidazol-2-yl]-amide (44.0 mg) was added, and the mixture was warmed to 80° C. The reaction was monitored by LCMS until substantially complete. Then, 10 mL of water was added and the reaction mixture was stirred for 10 minutes. The reaction was then filtered through a fine fritted funnel and the crude product was washed with water. After air drying, the product 6-[(S)-1-(tetrahydro-furan-2-yl)methoxy]-imidazo[1,2-b]pyridazine-2-carboxylic acid [5-(3-chloro-5-fluoro-phenyl)-1H-benzoimidazol-2-yl]-amide (24.8 mg) was purified by column chromatography (prepacked silica column) using 9:1 DCM and 2N ammonia in methanol. LCMS (m/z): 507.9. 1H NMR (400 MHz, CDCl3) δ 11.23 (1H, br. s.) 10.25-10.73 (1H, m) 8.40 (1H, s) 7.74 (2H, d) 7.38-7.44 (2H, m) 7.19-7.25 (2H, m) 7.04 (1H, dt) 6.83-6.89 (1H, m) 4.24-4.42 (3H, m) 3.82-4.03 (2H, m) 1.91-2.17 (2H, m) 1.67-1.82 (2H, m). the mixture was warmed to 80° C the reaction mixture was stirred for 10 minutes The reaction was then filtered through a fine fritted funnel the crude product was washed with water After air drying the product 6-[(S)-1-(tetrahydro-furan-2-yl)methoxy]-imidazo[1,2-b]pyridazine-2-carboxylic acid [5-(3-chloro-5-fluoro-phenyl)-1H-benzoimidazol-2-yl]-amide (24.8 mg) was purified by column chromatography (prepacked silica column)

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

Procedure: To a solution of (S)-tetrahydrofurfuryl alcohol (Codexis, 1.6 g, 15.2 mmol) in 5 mL of CH2Cl2 and 5 mL of pyridine was added p-toluenesulfonyl chloride (4.3 g, 22.8 mmol) in portions over 15 minutes. The mixture stirred at ambient temperature for 3 hours and was quenched with 10 mL of saturated, aqueous NaHCO3. The layers were separated and the aqueous layer was extracted with three 5 mL portions of CH2Cl2. The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to afford the title compound. MS (DCI/NH3) m/z 257 (M+H)+, 274 (M+NH4). was quenched with 10 mL of saturated, aqueous NaHCO3 The layers were separated the aqueous layer was extracted with three 5 mL portions of CH2Cl2 The combined organic extracts were dried over anhydrous Na2SO4 filtered concentrated under reduced pressure

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

Procedure: Mesylchloride (12.1 g) was added to a mixture of (S)-1-(Tetrahydro-furan-2-yl)-methanol (10.0 g) and pyridine (55 mL) at −15° C. and stirred for 1.5 hours at room temperature. The mixture was poured into ice water and extracted with ethyl acetate. The organic phase was washed with a solution of potassium hydrogensulfate (20%) and with a solution of saturated sodium hydrogencarbonate, dried over magnesium sulfate and concentrated. extracted with ethyl acetate The organic phase was washed with a solution of potassium hydrogensulfate (20%) and with a solution of saturated sodium hydrogencarbonate dried over magnesium sulfate concentrated

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

Procedure: To a solution of (S)-tetrahydrofurfuryl alcohol (Codexis, 1.6 g, 15.2 mmol) in 5 mL of CH2Cl2 and 5 mL of pyridine was added p-toluenesulfonyl chloride (4.3 g, 22.8 mmol) in portions over 15 minutes. The mixture stirred at ambient temperature for 3 hours and was quenched with 10 mL of saturated, aqueous NaHCO3. The layers were separated and the aqueous layer was extracted with three 5 mL portions of CH2Cl2. The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to afford the title compound. MS (DCI/NH3) m/z 257 (M+H)+, 274 (M+NH4)+. was quenched with 10 mL of saturated, aqueous NaHCO3 The layers were separated the aqueous layer was extracted with three 5 mL portions of CH2Cl2 The combined organic extracts were dried over anhydrous Na2SO4 filtered concentrated under reduced pressure

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

Procedure: To (S)-(tetrahydrofuran-2-yl)methanol (2.0 g, 20 mmol) in CH2Cl2 (10 mL) at about 0° C. was added p-toluenesulfonyl chloride (4.2 g, 22.00 mmol), followed by drop-wise addition of triethylamine (5.6 mL, 40.0 mmol). The resulting solution was kept at 0° C. for 2 hours, and then at room temperature for another 2 hours. The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added. The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated to yield the title compound (2.3 g, 13.00 mmol, 64%) as a colorless oil, which was used in the next step without purification. at room temperature for another 2 hours The reaction mixture was concentrated to dryness and diethylether (200 mL) and water (100 mL) were added The organic layer was separated dried over magnesium sulfate filtered concentrated