Propanoic acid, 2-bromo-2-methyl-, ethyl ester → HCID 58979392、化合物
反応式
[CH2:1]([C:4]1[CH:9]=[C:8]([O:10][CH2:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:7]=[CH:6][C:5]=1[OH:18])[CH:2]=[CH2:3].[H-].[Na+].Br[C:22]([CH3:29])([CH3:28])[C:23]([O:25][CH2:26][CH3:27])=[O:24]>CN(C=O)C>[CH2:26]([O:25][C:23](=[O:24])[C:22]([O:18][C:5]1[CH:6]=[CH:7][C:8]([O:10][CH2:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)=[CH:9][C:4]=1[CH2:1][CH:2]=[CH2:3])([CH3:29])[CH3:28])[CH3:27]参加物
5
実験手順
2-Allyl-4-benzyloxy-phenol (WO 9728137 A1 19970807, Adams et al.) (6.04 g, 25.1 mmol) in dry DMF (75 mL) was cooled in an ice bath and treated with NaH (1.78 g, 44.5 mmol, 60% oil dispersion). After 30 min, the red reaction mixture was treated over 5 min with ethyl bromoisobutyrate (7.4 mL, 50 mmol). The cold bath was removed after 5 min. The reaction was stirred 20 min and placed in an oil bath (T=85° C.). After 18 h, the mixture was cooled and partitioned between brine (75 mL) and ether (200 mL). The organic layer was washed with brine (50 mL), dried (Na2SO4), and concentrated to a brown oil (12 g). The crude product was purified by flash chromatography using hexanes:ethyl acetate (100:0 to 5:1) to give the desired product (8.47 g, 95%).