Cesium carbonate → (S)-N-(6-(1-acetyl-2-methyl-5-propoxy-1,2,3,4-tetrahydroquinolin-6-yl)pyridin-3-yl)methanesulfonamide

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-1-(2-methyl-5-propoxy-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydroquinolin-1(2H)-yl)ethanone (0.055 g, 0.147 mmol), N-(6-iodopyridin-3-yl)methanesulfonamide (0.046 g, 0.155 mmol), XPhos Precatalyst 2nd Generation (0.012 g, 0.015 mmol), and cesium carbonate (0.144 g, 0.442 mmol) in 1,4-dioxane (2.0 mL) and water (0.40 mL) was heated in the microwave at 100° C. for 1.5 h. The reaction mixture was filtered through Celite and concentrated to afford an orange oil. This material was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 25-100% ethyl acetate-hexane) to afford (S)—N-(6-(1-acetyl-2-methyl-5-propoxy-1,2,3,4-tetrahydroquinolin-6-yl)pyridin-3-yl)methanesulfonamide (0.007 g, 11%) as an off-white solid. 1H NMR (300 MHz, CDCl3) δ ppm 0.79-0.85 (m, 3H), 1.08 (d, J=6.45 Hz, 3H), 1.17-1.55 (m, 3H), 2.12 (s, 3H), 2.20-2.41 (m, 2H), 2.82-3.01 (m, 1H), 3.04 (s, 3H), 3.28-3.59 (m, 2H), 4.76 (br s, 1H), 6.64-6.86 (m, 1H), 6.98 (br s, 1H), 7.52 (d, J=8.21 Hz, 1H), 7.68 (dd, J=8.79, 2.64 Hz, 1H), 7.87 (d, J=8.50 Hz, 1H), 8.47 (d, J=2.64 Hz, 1H). MS (ESI, pos. ion) m/z 418 [M+H]+.

Provenance & Evidence