A 5 mL microwave vial was charged with Compound 238 (500 mg, 1.63 mmol), 3-(ethylsulfonyl)phenylboronic acid (419 mg, 1.96 mmol) and Pd(PPh3)4 (188 mg, 0.16 mmol). To the mixture was added dioxane (5 mL) and a saturated aqueous solution of K2CO3 (2.5 mL). The reaction mixture was heated at 140° C. for 20 min. in microwave. The reaction was diluted with EtOAc and washed with aqueous water and brine. The organic extracts were dried (Na2SO4) and concentrated and purified by flash chromatography to yield the title compound (528 mg, 82%).
