Diisopropylethylamine → HCID 86680084, compound

Participants

Reaction Steps

A solution of PyBOP (328 mg, 0.63 mmol) and 5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid from Example 25 (176 mg, 0.50 mmol) in DCM (5 mL) was stirred at room temperature for 30 min. A solution of Intermediate 33 (S)-tert-butyl 4-(4-amino-1-(4-methoxybenzyl)-1H-pyrazol-5-yl)-3-methylpiperazine-1-carboxylate (181 mg, 0.45 mmol) and DIPEA (0.13 mL, 0.72 mmol) in DCM (5 mL) was added and the mixture stirred at room temperature for 65 hr. The mixture was diluted with DCM (40 mL) and washed with water (15 mL). The organic layer was separated, passed through a phase separation cartridge and concentrated under reduced pressure. Purification via silica gel column chromatography (0-100% EtOAc/isohexane) gave (S)-tert-butyl 4-(4-(5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxamido)-1-(4-methoxybenzyl)-1H-pyrazol-5-yl)-3-methylpiperazine-1-carboxylate as a yellow solid (150 mg). This solid was re-dissolved in DCM (10 mL) and TFA (2 mL) was added before being heated at 65° C. for 2.5 hr. The mixture was concentrated under reduced pressure before being re-dissolved in 7 N ammonia in MeOH (20 mL) and heated in a sealed pressure vessel behind a blast shield at 55° C. for 16 hr. The mixture was concentrated under reduced pressure, re-dissolved in MeOH and passed through an SCX column, washing with DCM and MeOH and eluting with 3-10% 7 N ammonia in MeOH/DCM to give 174 as an off-white solid (60 mg, 32% over two steps). 1H NMR (400 MHz, d4-MeOD) δ 8.03 (s, 1H), 7.51-7.41 (m, 1H), 7.16 (t, J=8.9 Hz, 2H), 3.20-3.14 (m, 1H), 3.08-2.98 (m, 5H), 2.64 (dd, J=12.7, 9.4 Hz, 1H), 0.93 (d, J=6.2 Hz, 3H). LCMS (ES+) m/z 420 (M+1).

Provenance & Evidence