Diisopropylethylamine → HCID 71539969, compound

Participants

Reaction Steps

A solution of PyBOP (313 mg, 0.60 mmol) and 5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid from Example 25 (153 mg, 0.43 mmol) in DCM (10 mL) was stirred at room temperature for 30 min. A solution of (R)-tert-butyl 4-(4-amino-1-methyl-1H-pyrazol-5-yl)-3-methylpiperazine-1-carboxylate (133 mg, 0.45 mmol) and DIPEA (0.12 mL, 0.68 mmol) in DCM (10 mL) were added and the mixture stirred at room temperature for 16 hr. The mixture was diluted with DCM (50 mL) and washed with water (20 mL). The organic layer was separated, passed through a phase separation cartridge and concentrated under reduced pressure. The isolated intermediate was re-dissolved in DCM (6 mL) and TFA (2 mL) added. The mixture was stirred at room temperature for 4 hr. The mixture was concentrated under reduced pressure and the residue re-dissolved in DCM (50 mL) and washed with saturated aqueous NaHCO3 (2×10 mL). The organic layer was separated, passed through a phase separation cartridge and concentrated under reduced pressure. Purification by preparative HPLC gave 112 as a white solid (41 mg, 22% over two steps). 1H NMR (400 MHz, CDCl3) δ 8.66 (s, 1H), 7.92 (s, 1H), 7.38-7.25 (m, 1H), 7.03 (t, J=9.0 Hz, 2H), 6.20 (s, 2H), 3.77 (s, 3H), 3.27-3.15 (m, 2H), 3.10-2.93 (m, 4H), 2.59 (dd, J=12.5, 9.5 Hz, 1H), 0.88 (d, J=6.3 Hz, 3H). Alkyl NH not observed. LCMS (ES+) m/z 434 (M+1).

Provenance & Evidence