Aluminium lithium hydride → HCID 58706341, compound

Reaction equation

C[O:2][C:3](=O)[C:4]1[CH:9]=[C:8]([O:10][CH:11]2[CH2:16][CH2:15][O:14][CH2:13][CH2:12]2)[CH:7]=[C:6]([O:17][CH2:18][CH3:19])[CH:5]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-]>C1COCC1.O=[Mn]=O>[CH2:18]([O:17][C:6]1[CH:5]=[C:4]([CH:9]=[C:8]([O:10][CH:11]2[CH2:16][CH2:15][O:14][CH2:13][CH2:12]2)[CH:7]=1)[CH:3]=[O:2])[CH3:19]

Participants

Procedure

To a solution of 3-ethoxy-5-(tetrahydro-pyran-4-yloxy)-benzoic acid methyl ester (0.64 g, 2.28 mmol, 1.0 equiv) in anhydrous THF (20 mL) was added lithium aluminium hydride (0.217 g, 5.71 mmol, 2.5 equiv) and the reaction mixture stirred at rt for 4 h. The crude reaction mixture was filtered over Hyflo Super Cel, the filtrate extracted with diethyl ether (3×50 mL) and the combined organic phases dried over MgSO4 providing 0.56 g (100%) of the benzyl alcohol. The crude reaction product (0.56 g, 2.22 mmol, 1.0 equiv) was dissolved in THF (20 mL) and activated MnO2 (1.93 g, 22.2 mmol, 10.0 equiv) was added. After stirring at rt for 3 h, the reaction mixture was filtered over Hyflo Super Cel and the solvent removed by evaporation under reduced pressure. A conc. solution of sodium chloride (100 mL) was added, the mixture extracted with ethyl acetate (3×100 mL) and the combined organic phases dried over MgSO4 providing 0.46 g (83%) of the title compound. 1H NMR (300 MHz, CDCl3): δ 1.34 (t, J=7.0 Hz, 3H), 1.66-1.76 (m, 2H), 1.91-1.98 (m, 2H), 3.46-3.53 (m, 2H), 3.85-3.92 (m, 2H), 3.98 (q, J=7.0 Hz, 2H), 4.41-4.47 (m, 1H), 6.62-6.63 (m, 1H), 6.89-6.91 (m, 2H), 9.79 (s, 1H). 13C NMR (75 MHz, CDCl3): δ 14.62, 31.67, 63.90, 64.96, 72.02, 107.96, 108.68, 109.44, 138.49, 158.85, 160.71, 191.72. MS (ISP): 251.1 [M+H]+.