反应详情

To a solution of Example 173 (975 mg, 4.39 mmol) and ethyl [(1S)-5-hydroxy-2,3-dihydro-1H-inden-1-yl]acetate (1.06 g, 4.83 mmol) in THF (20 mL) were added Ph3P (1.88 g, 7.46 mmol) and ADDP (1.96 g, 7.46 mmol). The mixture was vigorously stirred at rt for 72 hours, the solvent removed under reduced pressure, and the residue purified by silica gel flash chromatography (6:1 hexanes/EtOAc) to yield the product (1.4 g, 76%) as a colorless oil that solidifies upon standing. (C19H22BrNO3S) LC-MS, RT 3.92 min., M+H 424.5; 1H NMR (CDCl3): δ1.26 (t, 3H), 1.65–1.81 (m, 1H), 2.28–2.45 (m, 2H), 2.37 (s, 3H), 2.69 (dd, 1H), 2.75–2.93 (m, 2H), 3.07 (t, 2H), 3.44–3.56 (m, 1H), 4.15 (t, 2H), 4.18 (q, 2H), 6.67 (dd, 1H), 6.73 (d, 1H), 7.03 (d, 1H).

1. customthe solvent removed under reduced pressure
2. customthe residue purified by silica gel flash chromatography (6:1 hexanes/EtOAc)