Water → 3-[(3R,4S)-3-Hydroxytetrahydro-2H-pyran-4-yl]-6-(4-morpholin-4-ylbenzyl)benzo[h]quinazolin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-(4-chlorobenzyl)-3-[(3R,4S)-3-hydroxytetrahydro-2H-pyran-4-yl]benzo[h]quinazolin-4(3H)-one (0.100 g, 0.238 mmol) in 2 mL of DMF under an atmosphere of nitrogen was added morpholine (0.083 g, 0.95 mmol), bis(tri-tert-butylphosphine)palladium(0) (0.012 g, 0.024 mmol), cesium carbonate (0.232 g, 0.713 mmol), and 0.2 mL of water. The mixture was warmed to 65° C. for 5 min, flushed with nitrogen, and irradiated in a microwave reactor at 130° C. for 25 min. The reaction was cooled to rt and diluted with water and dichloromethane. The aqueous layer was reextracted with dichloromethane and the combined organic fractions were dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified via silica gel chromatography, eluting with 0-4% methanol in dichloromethane to provide the title compound that gave proton NMR spectra consistent with theory and a mass ion (ES+) of 471.9 for [M+H]+: 1H NMR (400 MHz, CDCl3) δ 9.01 (s, 1H), 8.30 (s, 1H), 8.01-7.98 (m, 2H), 7.65-7.59 (m, 2H), 7.07 (d, J=8.7 Hz, 2H), 7.77 (d, J=8.7 Hz, 2H), 4.89-4.82 (m, 1H), 4.35 (s, 2H), 4.22-4.18 (m, 1H), 4.13-4.08 (m, 2H), 3.79 (t, J=4.8 Hz, 4H), 3.59-3.52 (m, 1H), 3.34-3.28 (m, 1H), 3.06 (t, J=4.8 Hz, 4H), 2.66 (br 5, 1H), 2.32-2.22 (m, 1H), 2.03-1.99 (m, 1H).

Provenance & Evidence