反应详情

To a solution of Intermediate 14A (6.0 g, 19.7 mmol) in DMF (197 mL) was added K2CO3 (8.18 g, 59.2 mmol) followed by 1,2-dibromoethane (2.6 mL, 30 mmol). The reaction mixture was stirred at rt for 2 days. The reaction was reduced in volume in vacuo, then diluted with EtOAc, washed with a 1:1 solution of sat'd aq NaCl and water, dried over anhydrous MgSO4, filtered and concentrated. The product was isolated by silica gel chromatography (220 g silica gel, eluted with EtOAc in hexanes) to provide Intermediate 14B (4.2 g, 61%) as a colorless oil. 1H NMR (500 MHz, CDCl3) δ 1.45-1.49 (m, 2H), 1.56-1.61 (m, 2H), 2.03-2.14 (m, 2H), 2.26-2.39 (m, 2H), 3.60 (s, 3H), 4.09 (t, J=6.05 Hz, 2H), 6.90-6.94 (m, 2H), 7.86-7.93 (m, 2H).

1. washwashed with a 1:1 solution of sat'd aq NaCl and water
2. dry with materialdried over anhydrous MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe product was isolated by silica gel chromatography (220 g silica gel, eluted with EtOAc in hexanes)