1-Methylpiperazine → 9-Fluoro-2-(2-isopropyl-5-methyl-1,2,4-triazol-3-yl)-10-[1-(4-methylpiperazin-1-yl)ethyl]-5,6-dihydroimidazo[1,2-d][1,4]benzoxazepine

Participants

Reaction Steps

A solution of 9-(1-bromoethyl)-8-fluoro-2-(2-isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diazabenzo[e]azulene from Example 374 (99 mg, 0.23 mmol), N-methylpiperazine (28 μL, 0.25 mmol) and DIPEA (60 μL, 0.35 mmol) in dioxane (1 mL) was stirred at RT for 72 h. The reaction mixture was concentrated in vacuo and the residue was purified by column chromatography (Si-PPC, gradient 0-8% 2 M NH3/MeOH in DCM) to give 66 mg of a pale yellow oil. The compound was further purified by reverse phase column chromatography (C18, gradient 2-50% MeOH in 1% TFA/H2O) and then loaded in MeOH onto an Isolute® SCX-2 cartridge. The cartridge was washed with MeOH and the product eluted with 2 M NH3 in MeOH. The basic fraction was concentrated in vacuo to afford 373 (47 mg, 40% over 2 steps) as a white solid. LCMS (Method K): RT 2.70 min [M+H]+ 454.2. 1H NMR (CD3OD, 400 MHz): δ 8.54 (1H, d, J=8.6 Hz), 7.68 (1H, s), 6.76 (1H, d, J=11.0 Hz), 5.83 (1H, sept., J=6.7 Hz), 4.49 (4H, br s), 3.84 (1H, q, J=6.8 Hz), 2.47 (8H, br s), 2.33 (3H, s), 2.22 (3H, s), 1.53 (3H, d, J=6.7 Hz), 1.52 (3H, d, J=6.7 Hz), 1.40 (3H, d, J=6.8 Hz)

Provenance & Evidence