Reaction Steps
To a mixture of ethyl 2-(2-hydroxy-6,7,8,9-tetrahydropyrido[1,2-a]indol-9-yl)acetate (50 mg, 0.183 mmol) and cesium carbonate (89 mg, 0.274 mmol) in DMF (2 mL) was added 5-(chloromethyl)-2-isopropoxybenzonitrile (46 mg, 0.22 mmol). The reaction was heated at 75° C. for 5 h and cooled down. The solid was filtered and washed with ethyl acetate. The combined solvent was evaporated, and the residue was purified by silica gel column chromatography to give the title compound (70 mg). LCMS m/z=447.4 [M+H]+; NMR (400 MHz, CDCl3) δ ppm 1.30 (t, J=7.1 Hz, 3H), 1.40 (d, J=6.1 Hz, 6H), 1.51-1.61 (m, 1H), 1.98-2.08 (m, 1H), 2.08-2.24 (m, 2H), 2.55 (dd, J=15.6, 8.6 Hz, 1H), 2.93 (dd, J=15.6, 5.4 Hz, 1H), 3.45-3.54 (m, 1H), 3.82-3.92 (m, 1H), 4.10-4.17 (m, 1H), 4.22 (q, J=7.1 Hz, 2H), 4.61-4.68 (m, 1H), 5.00 (s, 2H), 6.17 (s, 1H), 6.85 (dd, J=8.8, 2.4 Hz, 1H), 6.95 (d, J=8.8 Hz, 1H), 7.05 (d, J=2.4 Hz, 1H), 7.16 (d, J=8.7 Hz, 1H), 7.58 (dd, J=8.7, 2.2 Hz, 1H), 7.65 (d, J=2.2 Hz, 1H).
