Phosphorus oxychloride → HCID 57999116, compound

Participants

Reaction Conditions

Reaction Steps

In a 2-neck round-bottomed flask, under a blanket of nitrogen was added (R)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one (106a, 1.00 g, 2.85 mmol), 1H-benzo[d][1,2,3]triazole (106b, 0.678 g, 5.70 mmol) and anhydrous acetonitrile (14 mL). Phosphoryl trichloride (0.796 mL, 8.54 mmol) was added slowly to the mixture and the reaction was heated in 75° C. oil bath for 18 hours. By LC/MS about 7-10% of compound 1 remained unreacted. The reaction mixture was concentrated, then diluted with 80 mL of ethyl acetate and the resulting mixture was added slowly to 40 mL of saturated sodium bicarbonate. The layers were partitioned. The aqueous layer was washed one more time with 40 mL of ethyl acetate. The organic layers combined, washed with brine, dried over sodium sulfate, and concentrated to a yellow-light brown solid, 1.72 g, contained about 0.37 g of excess benzotriazole. The crude material was taken on to the next step without purification. MS (ES) [M+H] calc'd for C20H15BrFN7, 452. found, 452.3-454.3. 1H NMR (400 MHz, CHLOROFORM-d) 61.96 (s, 3H), 2.74 (dd, J=16.42, 14.91 Hz, 1H), 3.13 (dd, J=16.55, 4.17 Hz, 1H), 5.20 (dd, J=14.91, 4.04 Hz, 1H), 5.69 (s, 2H), 7.03-7.12 (m, 1H), 7.38 (dd, J=8.21, 2.65 Hz, 1H), 7.47-7.52 (m, 1H), 7.56-7.63 (m, 1H), 7.74 (dd, J=8.84, 6.06 Hz, 1H), 8.16 (d, J=9.35 Hz, 2H).

Provenance & Evidence