Water → Ethyl 8-chloro-1-[(6-methylpyridin-3-yl)methyl]-4-oxo-1,4-dihydrocinnoline-3-carboxylate

Beteiligte Stoffe

Reaktionsschritte

Ethyl 1-[(6-bromopyridin-3-yl)methyl]-8-chloro-4-oxo-1,4-dihydrocinnoline-3-carboxylate [(Example 69, Step 1), 0.11 g, 0.25 mmol] was dissolved in tetrahydrofuran (1.5 mL), sparged under nitrogen and treated with methylzinc chloride (0.18 mL, 2.0 M tetrahydrofuran solution, 0.35 mmol, 1.4 equiv) and 1,1′bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (10 mg, 0.013 mmol, 0.05 equiv). After stirring for 15 minutes, tetrakis(triphenylphosphine)palladium(0) (58 mg, 0.050 mmol, 0.2 equiv) were added and the mixture was stirred at ambient temperature for an additional 2 hours. The mixture was poured into water, extracted twice with ethyl acetate and the combined organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel gradient chromatography (100:0 to 0:100; hexanes:ethyl acetate), providing the titled compound.

Herkunft & Nachweise