Triethylamine → HCID 68748188, compound

Participants

Reaction Conditions

Reaction Steps

(S)-ethyl 6-bromo-1-(1-(2-(diethylamino)ethyl)piperidin-3-yl)-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate (Intermediate 35, 2.7 g, 5.63 mmol) and PdCl2(PPh3)2 (0.395 g, 0.56 mmol) were combined and suspended in 1,4-dioxane (50 mL). The slurry was degassed, purged with nitrogen and then gently warmed to 75° C. for 20 min. 4,4,4′,4′,5,5,5′,5′-Octamethyl-2,2′-bi(1,3,2-dioxaborolane) (4.29 g, 16.90 mmol) was then added in a single portion and the temperature was raised to 100° C. After an hour of heating, triethylamine (0.784 mL, 5.63 mmol) and potassium acetate (1.658 g, 16.90 mmol) were added sequentially. The reaction mixture was stirred at reflux overnight. The reaction mixture was cooled to room temperature and filtered through a celite. Solvent was removed in vacuo and the residue was purified via ISCO DCM/Methanol 0-20% gradient. (S)-8-(1-(2-(diethylamino)ethyl)piperidin-3-yl)-6-(ethoxycarbonyl)-5-oxo-5,8-dihydro-1,8-naphthyridin-3-ylboronic acid (2.0 g, 80%) was recovered as a brown solid.

Provenance & Evidence