Water → 2-[3,4-Dimethoxy-2-(2-phenylethyl)phenyl]-4,5-dihydro-4,4-dimethyloxazole

反応式

[C:1]1([CH2:7][CH2:8][Mg]Br)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:11][C:12]1([CH3:29])[CH2:16][O:15][C:14]([C:17]2[CH:22]=[CH:21][C:20]([O:23][CH3:24])=[C:19]([O:25][CH3:26])[C:18]=2OC)=[N:13]1.O>O1CCCC1>[CH3:26][O:25][C:19]1[C:18]([CH2:8][CH2:7][C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)=[C:17]([C:14]2[O:15][CH2:16][C:12]([CH3:11])([CH3:29])[N:13]=2)[CH:22]=[CH:21][C:20]=1[O:23][CH3:24]

参加物

実験手順

A solution of phenylethyl magnesium bromide (1 M in tetrahydrofuran (40 ml) was added to a stirred solution of 4,5-dihydro 4,4-dimethyl-2-(2,3,4-trimethoxyphenyl) oxazole (5.3 g 0.02 M) in dry tetrahydrofuran under a nitrogen atmosphere. The mixture was stirred at 20° for 16 hours. Water (200 ml) was added and the aqueous phase thoroughly extracted with diethyl ether (3×200 ml). The organic solution was dried over magnesium sulphate, filtered and evaporated to leave an oil which was purified by column chromatography on SiO2 eluting with ether/petroleum ether (50/50) to give a colourless oil (6.2 g); MS m/e 339.