Cesium carbonate → HCID 46207735, compound

Participants

Reaction Conditions

Reaction Steps

rac-6-[(6-chloropyridin-3-yl)methyl]-3-[trans-2-hydroxycyclohexyl]benzo[h]quinazolin-4(3H)-one was prepared as described in Example 1. To a solution of rac-6-[(6-chloropyridin-3-yl)methyl]-3-[trans-2-hydroxycyclohexyl]benzo[h]quinazolin-4(3H)-one (0.080 g, 0.19 mmol) in 3 mL of THF under an atmosphere of nitrogen was added cesium carbonate (0.38 mL, 1 N aqueous, 0.38 mmol), 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.079 g, 0.38 mmol), and bis(tri-tert-butylphosphine)palladium(0) (10 mol %). The reaction was heated at 100° C. for 20 h, cooled to rt, and diluted with ethyl acetate and water. The organic layer was removed and washed with saturated aqueous sodium bicarbonate and brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified via silica gel chromatography, eluting with 100% ethyl acetate, to provide the title compound that gave a proton NMR spectra consistent with theory and a mass ion (ES+) of 466.0 for [M+H]+: 1H NMR (400 MHz, CD3OD) δ 9.02-8.99 (m, 1H), 8.67 (br s, 1H), 8.61 (s, 1H), 8.33 (s, 1H), 8.23 (d, J=7.5 Hz, 1H), 8.03-8.00 (m, 2H), 7.82-7.62 (m, 4H), 4.60 (s, 2H), 4.10-4.04 (m, 1H), 3.89 (s, 3H), 2.08-2.00 (m, 1H), 1.93-1.83 (m, 1H), 1.90-1.72 (m, 3H), 1.38-1.30 (m, 4H).

Provenance & Evidence