3-methylsulfonylpropanoic acid

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

Procedure: To a reaction flask was added tert-butyl 4-amino-3,3-difluoropyrrolidine-1-carboxylate (1.36 g, 6.12 mmol), 3-(methylsulfonyl)propanoic acid (1.02 g, 6.73 mmol, 1.1 mol eq), DCM (31 mL, 0.4 M), NMM (1.35 mL, 12.2 mmol, 2 mol eq), HOBt (1.31 g, 9.2 mmol, 1.5 mol eq) and EDC-HCl (1.85 g, 9.2 mmol, 1.5 mol eq). The resulting suspension was stirred at ambient temperature under a nitrogen atmosphere for 2 hr. The reaction was diluted with DCM (80 mL), washed with aqueous NaHCO3 (2×30 mL) and the organic layer was dried over Na2SO4 and evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate to give the title product as a white foamy solid (1.65 g, 76% yield, >95% purity). 1H NMR (400 MHz, chloroform-d) δ ppm 6.45 (br. s., 1 H) 4.68-4.89 (m, 1 H) 3.94 (dd, J=10.70, 8.62 Hz, 1 H) 3.62-3.86 (m, 2 H) 3.43 (t, J=7.15 Hz, 2 H) 3.18 (br. s., 1 H) 2.97 (s, 3 H) 2.84 (td, J=7.15, 1.96 Hz, 2 H) 1.47 (s, 9 H). 19F NMR (376 MHz, chloroform-d) δ ppm −112.79-−110.52 (m, 1 F) −114.51-−113.30 (m, 1 F). m/z (APCI+) for C13H22F2N2O5S 257.1 (M+H)+. washed with aqueous NaHCO3 (2×30 mL) the organic layer was dried over Na2SO4 evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate

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

Procedure: To a reaction flask was added tert-butyl 4-amino-3,3-difluoropyrrolidine-1-carboxylate (1.36 g, 6.12 mmol), 3-(methylsulfonyl)propanoic acid (1.02 g, 6.73 mmol, 1.1 mol eq), DCM (31 mL, 0.4 M), NMM (1.35 mL, 12.2 mmol, 2 mol eq), HOBt (1.31 g, 9.2 mmol, 1.5 mol eq) and EDC-HCl (1.85 g, 9.2 mmol, 1.5 mol eq). The resulting suspension was stirred at ambient temperature under a nitrogen atmosphere for 2 hr. The reaction was diluted with DCM (80 mL), washed with aqueous NaHCO3 (2×30 mL) and the organic layer was dried over Na2SO4 and evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate to give the title product as a white foamy solid (1.65 g, 76% yield, >95% purity). 1H NMR (400 MHz, chloroform-d) δ ppm 6.45 (br. s., 1 H) 4.68-4.89 (m, 1 H) 3.94 (dd, J=10.70, 8.62 Hz, 1 H) 3.62-3.86 (m, 2 H) 3.43 (t, J=7.15 Hz, 2 H) 3.18 (br. s., 1 H) 2.97 (s, 3 H) 2.84 (td, J=7.15, 1.96 Hz, 2 H) 1.47 (s, 9 H). 19F NMR (376 MHz, chloroform-d) δ ppm −112.79-−110.52 (m, 1 F) −114.51-−113.30 (m, 1 F). m/z (APCI+) for C13H22F2N2O5S 257.1 (M+H)+. washed with aqueous NaHCO3 (2×30 mL) the organic layer was dried over Na2SO4 evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 1,1′-carbonyldiimidazole (73.0 g, 441 mmol, 1.1 eq) in acetonitrile (3.3 L) was stirred at 20° C. until a clear solution was obtained. 3-(methylsulfonyl)propanoic acid (67.0 g, 440 mmol, 1.1 eq) was then added and the mixture was stirred at 25° C. for 3 hr. (3R,4R)-1-benzyl-4-fluoropyrrolidin-3-amine bis-tosylate (220 g, 400 mmol, 1.0 eq) was added and the mixture was stirred at 25° C. for 16 hr resulting in a fine white slurry. The solids were filtered off and the byproduct cake washed with acetonitrile (600 mL). The acetonitrile solution was then concentrated to a low stir volume and then taken up in EtOAc (2.0 L) and washed with 1 N aqueous sodium bicarbonate (1.3 L). The aqueous layer was back extracted with EtOAc (500 mL) and the combined EtOAc layers were washed with water (1.0 L). The resulting EtOAc solution was distilled to remove about 2.0 L of distillate and then displaced with 2-propanol under atmospheric conditions until the internal temperature rose to 78° C. while maintaining a total volume of 2 L. The batch was then cooled to 20° C. and granulated at 20° C. for 12 hr resulting in product crystallization. The desired product was isolated by filtration and the cake washed with 2-propanol (600 mL), then dried in an oven at 40° C. under reduced pressure for 12 hr. The title compound (108 g, 308 mmol) was isolated in 77% yield. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.36 (br. d., J=7.0 Hz, 1 H) 7.37-7.29 (m, 4 H) 7.29-7.23 (m, 1 H) 4.90 (ddt, J=53.4, 5.3, 2×1.7 Hz, 1 H) 4.25 (dddd, J=26.4, 13.9, 7.0, 1.4 Hz, 1 H) 3.61 (d, J=13.2 Hz, 1 H) 3.57 (d, J=13.2 Hz, 1 H) 3.36-3.28 (m, 2 H) 3.03 (dd, J=9.3, 7.5 Hz, 1 H) 2.97 (s, 3 H) 2.80 (dd, J=24.0, 11.6 Hz, 1 H) 2.66 (ddd, J=30.6, 11.6, 5.3 Hz, 1 H) 2.57 (td, 2×7.7, 1.4 Hz, 2 H) 2.18 (dd, J=9.4, 6.7 Hz, 1 H). m/z (EI+) for C15H21FN2O3S 329.7 (M+H)+. was obtained the mixture was stirred at 25° C. for 3 hr the mixture was stirred at 25° C. for 16 hr resulting in a fine white slurry The solids were filtered off the byproduct cake washed with acetonitrile (600 mL) The acetonitrile solution was then concentrated to a low stir volume washed with 1 N aqueous sodium bicarbonate (1.3 L) The aqueous layer was back extracted with EtOAc (500 mL) the combined EtOAc layers were washed with water (1.0 L) The resulting EtOAc solution was distilled to remove about 2.0 L of distillate rose to 78° C. while maintaining a total volume of 2 L The batch was then cooled to 20° C. resulting in product crystallization

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

Procedure: A stirred solution of 1-(5′-chloro-3′-fluoro-3,5-dimethyl-[2,4′-bipyridin]-2′-yl)piperidin-4-amine (81.5 mg, 0.20 mmol), 3-(methylsulfonyl)propanoic acid (45.7 mg. 0.30 mmol), and NMM (80.9 mg, 0.80 mmol) in DMF (2 mL) was treated with HATU (91.3 mg, 0.24 mmol) portionwise. The reaction solution was stirred at rt under nitrogen for 2 h. EtOAc (30 mL) and brine (10 mL) were added and layers were separated. The organic layer was washed with brine (2×), dried over sodium sulfate, and concentrated. Purification on ISCO separation system with a 4-gram column using 0-8% MeOH in EtOAc afforded a colorless gum, which was sonicated in heptane/EtOAc to furnish a solid. After solvent removal, 56 mg (60%) of waxy, white solid was obtained: LRMS (M+H)+: 469.1; 1H NMR (400 MHz, CDCl3) δ 1.52 (dd, J=12.51, 3.66 Hz, 2 H), 2.02 (d, J=12.38 Hz, 2 H), 2.15 (s, 3 H), 2.39 (s, 3 H), 2.74 (t, J=6.95 Hz, 2 H), 2.96 (s, 3 H), 2.97-3.12 (m, 2 H), 3.42 (t, J=7.07 Hz, 2 H), 3.89-4.12 (m, 3 H), 5.63 (d, J=7.33 Hz, 1H), 7.47 (d, J=0.76 Hz, 1 H), 8.10 (s, 1 H), 8.40 (d, J=1.26 Hz, 1 H). layers were separated The organic layer was washed with brine (2×) dried over sodium sulfate concentrated Purification on ISCO separation system with a 4-gram column afforded a colorless gum, which to furnish a solid After solvent removal, 56 mg (60%) of waxy white solid was obtained

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

Procedure: To a solution of 5′-chloro-3,5-dimethyl-2′-(piperazin-1-yl)-2,4′-bipyridine (2.3 g, 15.1 mmol) and HOBT (2.55 g, 18.9 mmol) in CH2Cl2 (60 mL) was added NMM (5.67 g, 56.7). After stirring for 30 min at room temperature, EDCI (3.63 g, 18.9 mmol) and 3-(methylsulfonyl)propanoic acid (3.9 g, 12.6 mmol) were added and the mixture was stirred at 30° C. for 18 hours. TLC (CH2Cl2/MeOH=10:1) showed the starting material was consumed completely. After removal of the solvent in vacuo, the residue was dissolved in CH2Cl2 (180 mL), washed with saturated aq. NaHCO3 (40 mL), saturate aq. NH4Cl (40 mL) and brine (40 mL). The resulting material was dried over Na2SO4 and concentrated in vacuo to give title compound (4.8 g, 90%) as white solid. 1H NMR (400 MHz, CDCl3): δ 8.28 (s, 1H), 8.15 (s, 1H), 7.36 (s, 1H), 6.53 (s, 1H), 3.69-3.66 (m, 2H), 3.58-5.53 (m, 4H), 3.48-3.46 (m, 2H), 3.41-3.37 (m, 2H), 2.94 (s, 3H) 2.89-2.86 (m, 2H), 2.31 (s, 3H), 2.10 (s, 3H); m/z for C20H25ClN4O3S 437.3 (M+H)+. the mixture was stirred at 30° C. for 18 hours was consumed completely After removal of the solvent in vacuo the residue was dissolved in CH2Cl2 (180 mL) washed with saturated aq. NaHCO3 (40 mL) saturate aq. NH4Cl (40 mL) and brine (40 mL) The resulting material was dried over Na2SO4 concentrated in vacuo

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

Procedure: To a reaction flask was added tert-butyl 4-amino-3,3-difluoropyrrolidine-1-carboxylate (1.36 g, 6.12 mmol), 3-(methylsulfonyl)propanoic acid (1.02 g, 6.73 mmol, 1.1 mol eq), DCM (31 mL, 0.4 M), NMM (1.35 mL, 12.2 mmol, 2 mol eq), HOBt (1.31 g, 9.2 mmol, 1.5 mol eq) and EDC-HCl (1.85 g, 9.2 mmol, 1.5 mol eq). The resulting suspension was stirred at ambient temperature under a nitrogen atmosphere for 2 hr. The reaction was diluted with DCM (80 mL), washed with aqueous NaHCO3 (2×30 mL) and the organic layer was dried over Na2SO4 and evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate to give the title product as a white foamy solid (1.65 g, 76% yield, >95% purity). 1H NMR (400 MHz, chloroform-d) δ ppm 6.45 (br. s., 1 H) 4.68-4.89 (m, 1 H) 3.94 (dd, J=10.70, 8.62 Hz, 1 H) 3.62-3.86 (m, 2 H) 3.43 (t, J=7.15 Hz, 2 H) 3.18 (br. s., 1 H) 2.97 (s, 3 H) 2.84 (td, J=7.15, 1.96 Hz, 2 H) 1.47 (s, 9 H). 19F NMR (376 MHz, chloroform-d) δ ppm −112.79-−110.52 (m, 1 F) −114.51-−113.30 (m, 1 F). m/z (APCI+) for C13H22F2N2O5S 257.1 (M+H)+. washed with aqueous NaHCO3 (2×30 mL) the organic layer was dried over Na2SO4 evaporated to give a residue that was purified via silica flash chromatography eluting with gradients from 100% heptane to 100% ethyl acetate

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 1,1′-carbonyldiimidazole (73.0 g, 441 mmol, 1.1 eq) in acetonitrile (3.3 L) was stirred at 20° C. until a clear solution was obtained. 3-(methylsulfonyl)propanoic acid (67.0 g, 440 mmol, 1.1 eq) was then added and the mixture was stirred at 25° C. for 3 hr. (3R,4R)-1-benzyl-4-fluoropyrrolidin-3-amine bis-tosylate (220 g, 400 mmol, 1.0 eq) was added and the mixture was stirred at 25° C. for 16 hr resulting in a fine white slurry. The solids were filtered off and the byproduct cake washed with acetonitrile (600 mL). The acetonitrile solution was then concentrated to a low stir volume and then taken up in EtOAc (2.0 L) and washed with 1 N aqueous sodium bicarbonate (1.3 L). The aqueous layer was back extracted with EtOAc (500 mL) and the combined EtOAc layers were washed with water (1.0 L). The resulting EtOAc solution was distilled to remove about 2.0 L of distillate and then displaced with 2-propanol under atmospheric conditions until the internal temperature rose to 78° C. while maintaining a total volume of 2 L. The batch was then cooled to 20° C. and granulated at 20° C. for 12 hr resulting in product crystallization. The desired product was isolated by filtration and the cake washed with 2-propanol (600 mL), then dried in an oven at 40° C. under reduced pressure for 12 hr. The title compound (108 g, 308 mmol) was isolated in 77% yield. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.36 (br. d., J=7.0 Hz, 1 H) 7.37-7.29 (m, 4 H) 7.29-7.23 (m, 1 H) 4.90 (ddt, J=53.4, 5.3, 2×1.7 Hz, 1 H) 4.25 (dddd, J=26.4, 13.9, 7.0, 1.4 Hz, 1 H) 3.61 (d, J=13.2 Hz, 1 H) 3.57 (d, J=13.2 Hz, 1 H) 3.36-3.28 (m, 2 H) 3.03 (dd, J=9.3, 7.5 Hz, 1 H) 2.97 (s, 3 H) 2.80 (dd, J=24.0, 11.6 Hz, 1 H) 2.66 (ddd, J=30.6, 11.6, 5.3 Hz, 1 H) 2.57 (td, 2×7.7, 1.4 Hz, 2 H) 2.18 (dd, J=9.4, 6.7 Hz, 1 H). m/z (EI+) for C15H21FN2O3S 329.7 (M+H)+. was obtained the mixture was stirred at 25° C. for 3 hr the mixture was stirred at 25° C. for 16 hr resulting in a fine white slurry The solids were filtered off the byproduct cake washed with acetonitrile (600 mL) The acetonitrile solution was then concentrated to a low stir volume washed with 1 N aqueous sodium bicarbonate (1.3 L) The aqueous layer was back extracted with EtOAc (500 mL) the combined EtOAc layers were washed with water (1.0 L) The resulting EtOAc solution was distilled to remove about 2.0 L of distillate rose to 78° C. while maintaining a total volume of 2 L The batch was then cooled to 20° C. resulting in product crystallization