Cesium carbonate → (S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of (S)-methyl 6-bromo-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.060 g, 0.175 mmol), tert-butyl 4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate (0.066 g, 0.175 mmol), chloro(2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl)(2′-amino-1,1′-biphenyl-2-yl) palladium(II) (XPhos 2nd generation precatalyst) (0.014 g, 0.018 mmol), and cesium carbonate (0.171 g, 0.526 mmol) in 1,4-dioxane (2.0 mL) and water (0.40 mL) was heated in the microwave at 100° C. for 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 0-50% ethyl acetate-hexane) to afford (S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.090 g, 100%) as a colorless oil. MS (ESI, pos. ion) m/z 513 [M+H]+.

Provenance & Evidence