Diisopropylethylamine → 5-amino-2-(2,6-difluorophenyl)-N-(5-((2R,7R)-5-hydroxy-7-methyloxepan-2-yl)-1-methyl-1H-pyrazol-4-yl)thiazole-4-carboxamide

Participants

Reaction Steps

A solution of 2-methyl-7-(2-methyl-4-nitro-pyrazol-3-yl)oxepan-4-ol (79 mg, 0.30 mmol) in MeOH (20 mL) was passed through the H-Cube® (full H2, 70° C., flow rate: 1 mL/min, 30 mm 20% Pd(OH)2/C cartridge). The solvent was removed under reduced pressure and the crude residue was re-dissolved in MeOH (1 mL). 5-Amino-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid (94 mg, 0.37 mmol) and DIPEA (0.24 mL, 1.40 mmol) were added. Propylphosphonic anhydride solution (0.19 mL, 50% wt in EtOAc, 0.39 mmol) was added dropwise and the reaction mixture was stirred at room temperature for 16 hr. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in EtOAc (10 mL). The organic layer was washed with 1 M aqueous NaOH (3×10 mL), 1 M aqueous HCl (2×10 mL) and brine (10 mL), separated, dried over Na2SO4 and concentrated under reduced pressure. Purification via silica gel chromatography (0-5% 7 M NH3 in MeOH/DCM) gave 108 as a white solid (4 mg, 3% over two steps). 1H NMR (400 MHz, CDCl3) δ 9.69 (d, J=11.8 Hz, 1H), 8.16 (d, J=5.6 Hz, 1H), 7.37-7.30 (m, 1H), 7.04-6.97 (m, 2H), 6.15 (s, 2H), 5.00-4.93 (m, 1H), 4.17 (s, 1H), 4.03 (dd, J=8.0, 6.9 Hz, 1H), 3.77 (s, 3H), 2.11-1.74 (m, 5H), 1.28 (d, J=3.3 Hz, 1H), 1.21 (dd, J=9.2, 6.3 Hz, 3H). Alkyl OH not observed. LCMS (ES+) m/z 464 (M+1).

Provenance & Evidence