Perchloric Acid → (S)-ethyl 2-tert-butoxy-2-(3,6-dimethyl-1-(trifluoromethylsulfonyloxy)naphthalen-2-yl)acetate
反応式
[CH3:1][C:2]1[C:3]([C@H:21]([OH:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23])=[C:4]([O:13][S:14]([C:17]([F:20])([F:19])[F:18])(=[O:16])=[O:15])[C:5]2[C:10]([CH:11]=1)=[CH:9][C:8]([CH3:12])=[CH:7][CH:6]=2.Cl(O)(=O)(=O)=O>C(OC(C)=O)(C)(C)C>[C:2]([O:27][C@@H:21]([C:3]1[C:2]([CH3:1])=[CH:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([CH3:12])[CH:9]=2)[C:4]=1[O:13][S:14]([C:17]([F:19])([F:20])[F:18])(=[O:15])=[O:16])[C:22]([O:24][CH2:25][CH3:26])=[O:23])([CH3:3])([CH3:11])[CH3:1]参加物
4
実験手順
A solution of (S)-ethyl 2-(3,6-dimethyl-1-(trifluoromethyl-sulfonyloxy)naphthalen-2-yl)-2-hydroxyacetate (7.5 g, 18.5 mmol) in tBuOAc (100 mL) at room temperature was treated with perchloric acid (70%, 0.16 mL, 1.8 mmol) and allowed to stir at room temperature overnight. The reaction was slowly poured into ice-cold saturated NaHCO3 (150 mL). The aqueous layer was extracted with EtOAc and the combined organics washed with brine and dried over anhydrous MgSO4 and filtered. Following concentration in vacuo, purification of the residue by Yamazen silica gel column chromatography (2-20-50% EtOAc/hex) afforded (S)-ethyl 2-tert-butoxy-2-(3,6-dimethyl-1-(trifluoromethylsulfonyloxy)naphthalen-2-yl)acetate. LCMS-ESI+ (m/z): [M+Na]+ calcd for C21H25F3O6SNa: 485.5. found: 485.8.