To a solution of {3-[3-(2,2-diphenyl-ethylamino)-propoxy]-phenyl}-acetic acid methyl ester (3) (0.40 g, 0.001 mol) in DMF (10 mL), was added 3,5-di-tert-butyl-benzyl bromide (0.30 g, 0.0011 mol) and powdered potassium carbonate (0.96 g, 0.007 mol), the reaction mixture was heated and stirred at 45° C. for 18 hours. After cooling, the reaction mixture was diluted with water (30 mL) and extracted with EtOAc (3×25 mL). The combined organic extracts were washed with brine (15 mL), dried over Na2SO4, concentrated to an oil, which was purified by flash chromatography (9:1 Hexanes/EtOAc) to give the desired product as oil 0.56 g in 92% yield. 1H NMR (CDCl3) δ 7.19 (m, 10H), 7.12 (t, 2H), 7.01 (d, 2H), 6.82 (d, 1H), 6.63 (s, 1H), 6.59 (d, 1H), 4.17 (t, 1H), 3.67 (s, 3H), 3.62 (s, 2H), 3.57 (t, 2H), 3.55 (s, 2H), 3.10 (d, 2H), 2.58 (t, 2H), 1.77 (t, 2H), 1.26 (s, 18H). 13C NMR (CDCl3) δ 173.3, 160.6, 151.8, 145.1, 140.1, 136.5, 130.8, 129.8, 129.7, 129.6, 129.5, 127.6, 124.5, 122.6, 122.1, 117.0, 114.6, 67.3, 61.3, 53.4, 52.3, 51.2, 51.1, 42.7, 36.1, 32.9, 28.2.
