Hydrochloric Acid → HCID 51037661, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 2,2-diethoxy-N,N-dimethylethanamine (1.56 g, 9.70 mmol) and water (1.6 mL) at room temperature and under a nitrogen atmosphere was added an aq. 37% HCl (1.62 mL, 19.3 mmol). After addition the mixture was stirred at 45° C. (bath) for 25 h. It was cooled to 0° C. (bath). This is called solution A. KOH (2.76 g, 49.3 mmol) was dissolved in water (8 mL) at room temperature under a nitrogen atmosphere. It was cooled to 0° C. (bath). This is called solution B. To a stirred heterogeneous mixture of compound 235 (1.76 g, 3.85 mmol) and THF (8 mL) at room temperature and under a nitrogen atmosphere was added minimum amount of DMA (4 mL) to give a homogeneous solution. LiCl (163 mg, 3.85 mmol) was added and stirred at 0° C. (bath) for 15 min. The cold solution B was added and stirred at 0° C. for 2 min. Then the cold solution A was added and the final reaction mixture was continued to stir at 0° C. under a nitrogen atmosphere. The reaction was monitored by TLC (DCM-MeOH=10:1). After stirred for 30 min. it was poured into water (300 mL). Petroleum ether (300 mL) was added and stirred at room temperature for 10 min. Petroleum ether layer was decanted. More petroleum ether (300 mL) was added and stirred for 10 min. The solid was collected by suction filtration; washed with water (4×20 mL); dried under reduced pressure over silica gel/KOH to give compound 8 (1.38 g, 92%) which was found only 89.7% pure by HPLC. Thus, the sample was stirred with MeOH (ca. 40 mL) for 30 min. The insoluble material was filtered off and to the filtrates was added one volume of water to precipitate out the required product. The solid was collected, washed with water/MeOH=3:1 (3×15 mL) and dried to give (2E)-4-(dimethylamino)-N-[4-(3-ethynyl-4-fluoroanilino)pyrido[3,4-d]pyrimidin-6-yl]-2-butenamide (8) (1.28 g, 85%) as a yellow/brown solid, mp 152-155° C.; 1H NMR δ [(CD3)2SO] 10.93 (s, 1H), 10.29 (s, 1H), 9.02 (s, 1H), 8.99 (s, 1H), 8.61 (s, 1H), 8.04 (dd, J=6.4, 2.7 Hz, 1H), 7.94-7.85 (m, 1H), 7.35 (t, J=9.1 Hz, 1H), 6.87 (dt, J=15.4, 6.0 Hz, 1H), 6.52 (br d, J=15.4 Hz, 1H), 4.53 (s, 1H), 3.09 (br d, J=6.0 Hz, 2H), 2.19 (s, 6H). Anal. Calcd for C21H19FN6O.0.8H2O.0.7MeOH: C, 61.00; H, 5.52; N, 19.67%. Found C, 61.26; H, 5.25; N, 19.47%.

Provenance & Evidence