Triethylamine → 5-(3-{(3R,4R)-1-tert-butoxycarbonyl-3-[(S)-3-(4-fluoro-benzyl)-piperidine-1-carbonyl]-piperidin-4-yl}-ureido)-indazole-1-carboxylic acid t-butyl ester

Participants

Reaction Conditions

Reaction Steps

In a dry flask (3R,4R)-4-Amino-3-[(S)-3-(4-fluoro-benzyl)-piperidine-1-carbonyl]-piperidine-1-carboxylic acid t-butyl ester (72 mg, 0.171 mmol) was dissolved in acetonitrile (2 mL) and triethylamine (25 μL, 0.179 mmol) and 5-(phenoxycarbonylamino)-1-indazolecarboxylic acid 1-tert-butyl ester (72 mg, 0.204 mmol) were added. The reaction mixture was stirred for 64 hours while heating to 60° C. The reaction mixture was cooled, diluted with ethyl acetate, washed twice with water and once with brine. The organic layer was dried with magnesium sulfate, filtered and concentrated in vacuo. The crude product was purified by preparative reverse-phase HPLC (10-80% acetonitrile in water with 0.05% trifluoroacetic acid) to give a white amorphous solid (71 mg, 61%). 1H NMR (300 MHz, CDCl3), δ: 8.09 (m, 2H), 7.90 (2s, 1H), 7.44 (m, 1H), 7.10 (m, 1H), 6.99 (m, 1H), 6.83 (m, 2H), 4.90 (bs, 1H), 4.43 (bd, 1H, J=11), 4.22 (bs, 2H), 3.98 (bm, 2H), 3.14 (t, 1H, J=13), 2.75 (bm, 4H), 2.45 (bm, 3H), 1.94 (bm, 3H), 1.73 (2s, 9H), 1.48 (m, 9H), 1.45 (bm, 3H), 1.22 (bm, 1H). HRMS (ESI), C36H48FN6O6 m+/z: calc.=679.3619, found=679.3621.

Provenance & Evidence