Ethanol → HCID 10084055, Verbindung
Reaktionsgleichung
CS(O)(=O)=O.[CH3:6][O:7][C:8]1[CH:9]=[C:10]2[C:15](=[CH:16][CH:17]=1)[C:14](=[O:18])[CH:13]([CH2:19][C:20]([OH:22])=[O:21])[CH2:12][CH2:11]2.[CH2:23](O)[CH3:24]>>[CH3:6][O:7][C:8]1[CH:9]=[C:10]2[C:15](=[CH:16][CH:17]=1)[C:14](=[O:18])[CH:13]([CH2:19][C:20]([O:22][CH2:23][CH3:24])=[O:21])[CH2:12][CH2:11]2Komponenten
4
Versuchsvorschrift
Methane sulfonic acid (450 mL) was added to a solution of 1B (250 g, 1067 mmol) in ethanol (1.5 L), and the mixture was stirred at room temperature for 16 h. Ethanol was removed from the reaction mixture under reduced pressure, and residue was diluted with ethyl acetate and extracted with brine solution. The organic layer was dried over sodium sulfate and filtered, and the filtrate was concentrated under vacuum to afford the title compound (241 g, 81%) as a solid. 1H NMR (400 MHz, CDCl3): δ 7.99 (d, J=8.8 Hz, 1H), 6.82 (dd, J1=2.4 Hz, J2=8.8 Hz, 1H), 6.68 (d, J=2.4 Hz, 1H), 4.18 (q, J=8.1 Hz, 2H), 3.8 (s, 3H), 3.12-2.85 (m, 4H), 2.39 (q, J=9.0 Hz, 1H), 2.23 (m, 1H), 1.94 (dq, J1=4.5 Hz, J2=12.6 Hz, 1H), 1.28 (t, J=7.5 Hz, 3H). ESI-MS m/z: 263 (M+H)+.