Diisopropylethylamine → 4-[3-(1-Pyridin-2-yl-[1,2,4]triazolo[4,3-a]quinolin-7-ylsulfanyl)-phenyl]-tetrahydro-pyran-4-carboxylic acid methyl ester

Participants

Reaction Steps

5m (216 mg, 0.47 mmol) was dissolved in 1,4-dioxane (5 mL) and degassed with N2 for 20 minutes. Potassium tert-butoxide (55 mg, 0.49 mmol) was added, and the reaction was stirred at room temperature overnight. The mixture was degassed with N2 for an additional 20 minutes, and then 4-(3-Bromo-phenyl)-tetrahydro-pyran-4-carboxylic acid methyl ester (5o, 141 mg, 0.47 mmol) in 1,4-dioxane (1 mL) was added, followed by iPr2NEt (0.18 mL, 1.03 mmol), Pd2dba3 (11 mg, 0.01 mmol), and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (15 mg, 0.02 mmol). The reaction was sealed and heated to 110° C. for 1.5 hours. The mixture was cooled to room temperature and concentrated, and the residue was purified by silica gel chromatography (20-100% EtOAc in hexanes, followed by 0-10% MeOH in EtOAc) to give the desired product, 5p.

Provenance & Evidence