Acetyl chloride → HCID 90409550, compound

Participants

Reaction Steps

A solution of 4-[2-(aminomethyl)pyridin-3-yl]-7-(3,5-dimethylisoxazol-4-yl)-4,5-dihydroimidazo[1,5,4-de][1,4]benzoxazin-2(1H)-one bis(trifluoroacetate) (35.0 mg, 0.058 mmol) in methylene chloride (2.0 mL) was treated with N,N-diisopropylethylamine (50.3 μL, 0.289 mmol) and stirred. Once the starting material was completely dissolved, the reaction mixture was treated with acetyl chloride (49.3 μL, 0.069 mmol) (added as a 10% solution in dichloromethane) and stirred at room temperature for 1 h. The reaction mixture was quenched with methanol and the solvent was concentrated to give the crude product. Purification by preparative LCMS (XBridge C18 column, eluting with a gradient of acetonitrile/water containing 0.1% ammonium hydroxide, at flow rate of 60 mL/min) gave the desired product (18 mg, 74%) as a racemic mixture. 1H NMR (500 MHz, DMSO-d6) δ 10.98 (br s, 1H), 8.50-8.47 (m, 1H), 8.44 (dd, J=5.2, 5.2 Hz, 1H), 7.26 (dd, J=7.9, 4.7 Hz, 1H), 7.23-7.16 (m, 1H), 6.88 (d, J=8.0 Hz, 1H), 6.78 (d, J=8.0 Hz, 1H), 5.68 (dd, J=3.1, 3.1 Hz, 1H), 4.71 (dd, J=15.1, 6.1 Hz, 1H), 4.55-4.47 (m, 2H), 4.44 (dd, J=11.6, 3.2 Hz, 1H), 2.28 (s, 3H), 2.12 (s, 3H), 1.88 (s, 3H); LCMS calculated for C22H22N5O4 (M+H)+: m/z=420.2. found: 420.1.

Provenance & Evidence