[O:1]=[C:2]([C:8]1[CH:13]=[CH:12][C:11]([O:14][CH2:15][CH2:16][CH2:17][C:18]([F:21])([F:20])[F:19])=[CH:10][CH:9]=1)[CH2:3][C:4]([O:6][CH3:7])=[O:5].C([O-])([O-])=O.[K+].[K+].Br[CH2:29][CH2:30]Br>CN(C=O)C.CCOC(C)=O>[F:21][C:18]([F:19])([F:20])[CH2:17][CH2:16][CH2:15][O:14][C:11]1[CH:12]=[CH:13][C:8]([C:2]([C:3]2([C:4]([O:6][CH3:7])=[O:5])[CH2:30][CH2:29]2)=[O:1])=[CH:9][CH:10]=1To 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).
読み込み中…
