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With tetrakis(triphenylphosphine) palladium(0); sodium carbonate; In 1,2-dimethoxyethane; water; at 100.0℃; for 18.0h;Schlenk technique;
Process I: A 20- mL Schlenk flask was charged with [5-(methoxycarbonyl)-2- methylphenyl]boronic acid (200 mg, 1.03mmol),12 1-bromo-2- methylnaphthalene (80.0 L, 521 mol), 2.00M aq Na2CO3 (1.00 mL, 2.00mmol), and DME (4.00 mL). After degassing the whole mixture by three freeze-thaw cycles, to the suspension was added [Pd(PPh3)4] (60.0 mg, 51.9 mol). The mixture was heated at 100 C for 18 h. The reaction mixture was cooled to rt, and then the diphase solution was acidified by addition of 1M aq HCl (10 mL). This was extracted with CH2Cl2 (10mL 3), and the organic extracts were dried over Na2SO4 (ca. 5 g), filtered, and concentrated to give the crude product (0.3 g) as a yellow oil. This was used for the next reaction without further purification