1-(4-nitro-1H-pyrazol-5-yl)-4-(trimethylsilyloxy)-1,2,3,6-tetrahydropyridine → tert-butyl 4-(4-amino-1-methyl-1H-pyrazol-5-yl)-6-methoxy-1,4-diazepane-1-carboxylate

Participants

Reaction Steps

A solution of Intermediate 47, tert-butyl 6-methoxy-4-(1-methyl-4-nitro-1H-pyrazol-5-yl)-1,4-diazepane-1-carboxylate (114 mg, 0.32 mmol) in MeOH (15 mL) was passed through the H-Cube® (full H2, 70° C., flow rate: 1 mL/min, 30 mm 10% Pd/C cartridge). The solvent was removed under reduced pressure to afford tert-butyl 4-(4-amino-1-methyl-1H-pyrazol-5-yl)-6-methoxy-1,4-diazepane-1-carboxylate as a pink solid (100 mg). To a solution of this solid in DCM (5 mL) was added DIPEA (0.84 mL, 48 mmol), PyBOP (219 mg, 0.42 mmol) and 5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid from Example 25 (118 mg, 0.33 mmol) and the mixture was stirred at room temperature for 65 hr. The mixture was diluted with DCM (50 mL) and washed with water (10 mL). The organic layer was separated, passed through a phase separation cartridge and concentrated under reduced pressure. Purification via silica gel column chromatography (0-5% MeOH/DCM) gave tert-butyl 4-(4-(5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxamido)-1-methyl-1H-pyrazol-5-yl)-6-methoxy-1,4-diazepane-1-carboxylate as a pink solid (160 mg). This solid (159 mg, 0.24 mmol) was dissolved in HCl in 1,4-dioxane (4 M, 3 mL, 12.0 mmol) and MeOH (3 mL) and heated in a sealed pressure vessel behind a blast shield at 60° C. for 16 hr. The solvents were removed under reduced pressure and the crude residue re-dissolved in MeOH and loaded onto an SCX column. The column was washed with MeOH and eluted with 0-10% 7 N ammonia in MeOH/DCM to give 194 as a pale brown solid (53 mg, 36% over three steps). 1H NMR (400 MHz, CDCl3) δ 11.35 (s, 1H), 8.13 (s, 1H), 7.39-7.29 (m, 1H), 7.04 (t, J=8.6 Hz, 2H), 6.33 (s, 2H), 3.74 (s, 3H), 3.41-3.28 (m, 4H), 3.36-3.00 (m, 6H), 2.88-2.77 (m, 1H), 2.69 (dd, J=12.7, 7.6 Hz, 1H). Alkyl NH not observed. LCMS (ES+) m/z 464 (M+1).

Provenance & Evidence