Potassium Carbonate → HCID 44218746, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 2-[3-(2-Methoxy-ethoxy)-phenyl]-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (Step 5, 109 mg, 0.39 mmol) in THF/H2O (10:1; 3 mL) was added to a microwave vial containing 3-(5-iodo-pyridin-2-yloxy)-azetidine-1-carboxylic acid pyrimidin-4-ylamide (step 4, 104 mg, 0.26 mmol) and potassium carbonate (108 mg, 0.786 mmol). Nitrogen gas was bubbled through the mixture for 5 mins then 1,1′-bis[(diphenylphosphino)-ferrocene]dichloropalladium(II) complex with CH2Cl2 (21 mg, 10 mole %) was added and the vial sealed and heated at 100° C. in microwave synthesiser for 30 min. The cooled reaction mixture was diluted with ethyl acetate (20 mL) and washed through celite (2.5 g IST cartridge). A further 10 mL of ethyl acetate was washed through the celite pad and combined filtrate was washed sequentially with water (30 mL), 1N NaOH solution (30 mL), water (30 mL) then sat. sodium chloride solution (30 mL). Mixture dried over sodium sulphate and filtered. Filtrate solvents were removed in vacuo to afford a brown gum, which was purified by flash chromatography, eluting with a gradient of 50 to 100% ethyl acetate in hexane to a afford a gummy solid. Product was dissolved in dichloromethane (25 mL) and 2N NaOH (aq, 25 mL) was added and mixture stirred vigorously for 1 h. Phases were separated and the organic layer dried over sodium sulphate, filtered and filtrate solvent removed in vacuo to leave a solid, which was triturated with diethyl ether, filtered and dried to afford the title compound as colourless solid (50 mg, 45%)

Herkunft & Nachweise