Piperidine → (2R)-1-[(5-amino-7-methoxy-2,3-dihydroimidazo[1,2-c]quinazolin-8-yl)oxy]-3-piperidin-1-ylpropan-2-ol

Participants

Reaction Steps

To a slurry of 5-amino-7-methoxy-2,3-dihydroimidazo[1,2-c]quinazolin-8-ol bis(trifluoroacetate) (Intermediate E, 3.00 g, 6.52 mmol) in DMF (72 mL) was added caesium carbonate (10.62 g, 32.6 mmol, 10.0 equiv.) and the resulting slurry was stirred at room temperature for 1.5 hr, followed by the addition of (R)-glycidyl methanesulfonate (Intermediate F, Step 1, 45 mL, 0.29 M in DMF, 13.0 mmol, 2.0 equiv.). This mixture was stirred at 60° C. for 12 hr and concentrated under reduced pressure to a volume of approximately 50 mL and divided into 3 portions. Each portion was treated with 2.15 mL piperidine (6.45 mL total, 65.2 mmol, 10 equiv.) and was heated in a microwave reactor for 45 min. at 140° C. The combined resulting mixtures were concentrated under reduced pressure. The resulting solids (1.93 g) were purified by MPLC to give N-(8-{[(2R)-2-hydroxy-3-(piperidin-1-yl)propyl]oxy}-7-methoxy-2,3-dihydroimidazo[1,2-c]quinazolin-5-yl)amine (1.93 g, 79%): 1H NMR (DMSO-d6+1 drop TFA-d) δ 1.30-1.43 (m, 1H), 1.56-1.70 (m, 2H), 1.70-1.84 (m, 2H), 2.88-3.04 (m, 2H), 3.11-3.32 (m, 2H), 3.42-3.52 (m, 2H), 3.82 (s, 3H), 4.09-4.17 (m, 4H), 4.28-4.38 (m, 3H), 7.24 (d, J=9.4 Hz, 1H), 7.83 (d, J=9.1 Hz, 1H).

Provenance & Evidence