A mixture of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol (1 g, 4.5 mmole), tetrahydro-2H-pyran-4-yl 4-methylbenzenesulfonate (1.4 g, 5.4 mmole) and K2CO3 (1.3 g, 9 mmole) in DMF (10 mL) was heated at 85° C. for 20 h. The mixture was diluted with ethyl acetate, washed with water, dried over MgSO4, filtered, and concentrated under vacuum. The residue was purified by ISCO (silica gel, elute: 10% ethyl acetate in hexane) to give the title compound (335 mg, 24% yield) as a solid. MS (ESI) m/z: Calc. 304.2 (M+). Found: 305.3 (M++1).
