To a degassed solution of the product of step 1 (5.7 g, 24.2 mmol,), and 4-hydroxymethylphenylboronic acid (5.47 g, 36 mmol) in toluene (150 mL) was added Pd2(dba)3 (1.09 g, 1.2 mmol). The mixture was degassed and Ph3P (2.5 g, 9.6 mmol), Et2NH (2.63 g, 36 mmol), n-propanol (18 mL) and H2O (18 mL) was added. The mixture was heated to reflux for 26 h. Aqueous NaHCO3 was added and the resulting mixture was extracted with EtOAc. The combined organic extracts were washed with brine, dried (anhyd. MgSO4) and concentrated in vacuo. The residue was purified by chromatography on silica gel to give 6.06 g (95%) of the title compound.
