Tetrahydrofuran → N2-(benzo[d]thiazol-6-yl)-N4-isopropyl-5-(5-((1-(methylsulfonyl)piperidin-4-yl)amino)-1,3,4-oxadiazol-2-yl)pyridine-2,4-diamine

Participants

Reaction Steps

To a stirred solution of N2-(benzo[d]thiazol-6-yl)-N4-isopropyl-5-(5-(piperidin-4-ylamino)-1,3,4-oxadiazol-2-yl)pyridine-2,4-diamine (Example 131) (30 mg, 0.06 mmol) in DCM (4 mL): THF (4 mL), added DIPEA (0.09 mmol, 1.5 equiv.) and DMAP (0.006 mmol, 0.1 equiv.) and stirred for 5 min. Added mesyl chloride (0.5 mmol, 0.8 equiv.) dropwise at 0° C. Stirred the reaction mixture at 0° C. for 1 h, reaction temperature was brought to room temperature and stirred overnight. The reaction mixture was diluted with DCM. The DCM layer was washed with 10% NaHCO3 solution followed by water. The DCM layer was collected, dried over Na2SO4, filtered and concentrated. The material obtained was purified by prep HPLC to afford the title compound, N2-(benzo[d]thiazol-6-yl)-N4-isopropyl-5-(5-((1-(methylsulfonyl)piperidin-4-yl)amino)-1,3,4-oxadiazol-2-yl)pyridine-2,4-diamine. 1H NMR: 400 MHz, CD3OD: δ 1.34 (d, J=6.40 Hz, 6H), 1.66-1.75 (m, 2H), 2.10-2.14 (m, 2H), 3.027 (s, 3H), 3.30-3.36 (1H, merged with water peak), 3.56-3.60 (m, 1H), 3.78-3.82 (m, 1H), 4.00-4.05 (m, 2H), 6.17 (s, 1H), 7.53-7.57 (m, 1H), 7.98 (d, J=8.80 Hz, 1H), 8.38 (s, 1H), 8.43 (d, J=2.00 Hz, 1H), 9.08 (s, 1H). LC/MS: ZORBAX SB C18, 4.6×50 mm, 5 μm; Solvent A=10% MeOH: 90% H2O: 0.1% TFA; Solvent B=90% MeOH: 10% H2O: 0.1% TFA; gradient 0-100% B over 2 min (3 min run time); retention time: 1.501 min; LCMS (ES-API), m/z 529.2 (M+H). HPLC: Sunfire C18 (150×4.6 mm), 3.5 micron; Solvent A=5% ACN: 95% H2O: 0.05% TFA pH=2.5; Solvent B=95% ACN: 5% H2O: 0.05% TFA pH=2.5; gradient 0-100% B over 15 min (23 min run time); Flow rate: 1.0 μL/min; Retention time: 5.771 min; Purity: 99.7%.

Provenance & Evidence