Diisopropylethylamine → HCID 67437983, compound

Participants

Reaction Steps

A solution of 5-(3,6-dihydro-2H-pyran-4-yl)-1-methyl-4-nitro-1H-pyrazole (80 mg, 0.38 mmol) in MeOH (20 mL) was passed through the H-Cube® (30 bar, 25° C., flow rate: 1 mL/min, 30 mm 10% Pd/C cartridge). The solvent was removed under reduced pressure to afford crude 1-methyl-5-(tetrahydro-2H-pyran-4-yl)-1H-pyrazol-4-amine as a light yellow oil (64 mg, 0.35 mmol). To a solution of this amine (60 mg, 0.33 mmol) in DCM (20 mL) was added DIPEA (0.5 mL, 2.87 mmol), PyBOP (0.34 g, 0.66 mmol) and 5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid (124 mg, 0.35 mmol) and the mixture was stirred at room temperature for 18 hr. The mixture was diluted with DCM and washed with water. The organic layer was separated, dried over MgSO4 and the solvent removed under reduced pressure. Purification via silica gel column chromatography (0-80% EtOAc/isohexane) gave tert-butyl 2-(2,6-difluorophenyl)-4-(1-methyl-5-(tetrahydro-2H-pyran-4-yl)-1H-pyrazol-4-ylcarbamoyl)thiazol-5-ylcarbamate as an off-white solid (102 mg, 59%). This solid (100 mg, 0.19 mmol) was stirred in HCl in 1,4-dioxane (4.0 M, 1.9 mL) at room temperature for 18 hr. The solvents were removed under reduced pressure and the crude residue was re-dissolved in MeOH and loaded onto an SCX column. The column was washed with MeOH and 7 N ammonia in MeOH to yield 301 as a peach solid (59 mg, 73%). 1H NMR (400 MHz, CDCl3) δ 8.42 (s, 1H), 7.69 (s, 1H), 7.34-7.29 (m, 1H), 7.02 (t, J=8.7 Hz, 2H), 6.11 (s, 2H), 4.09 (dd, J=11.6, 4.2 Hz, 2H), 3.88 (s, 3H), 3.50 (t, J=11.6 Hz, 2H), 3.02-2.95 (m, 1H), 2.17-2.08 (m, 2H), 1.78 (d, J=13.4 Hz, 2H). LCMS (ES+) m/z 420 (M+1)

Provenance & Evidence