Trifluoroacetic acid → HCID 59909762、化合物
反応式
C([O:5][C:6](=[O:28])[CH2:7][C@H:8]([C:18]1[O:19][C:20]([CH3:27])=[C:21]([C:23]([O:25][CH3:26])=[O:24])[N:22]=1)[CH2:9][CH2:10][CH2:11][CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]1)(C)(C)C.FC(F)(F)C(O)=O>ClCCl>[CH:12]1([CH2:11][CH2:10][CH2:9][C@@H:8]([C:18]2[O:19][C:20]([CH3:27])=[C:21]([C:23]([O:25][CH3:26])=[O:24])[N:22]=2)[CH2:7][C:6]([OH:28])=[O:5])[CH2:13][CH2:14][CH2:15][CH2:16][CH2:17]1参加物
4
実験手順
A solution of methyl 2-{(1R)-1-[2-(tert-butoxy)-2-oxoethyl]-4-cyclohexylbutyl}-5-methyl-1,3-oxazole-4-carboxylate (Preparation 173) (2.92 g, 7.43 mmol) in anhydrous dichloromethane (15 ml) was treated with trifluoroacetic acid (7.5 ml) and the resulting mixture was stirred at room temperature under a nitrogen atmosphere for 24 hours. The solvent was removed under reduced pressure and the residue was azeotroped with dichloromethane (×3). The residue was purified by column chromatography on silica gel eluting with a gradient system of ethyl acetate:pentane (0:100 to 40:60) to afford the title compound as a colourless oil (2.50 g).