[CH3:1][N:2]([CH3:22])[C:3]1[CH:4]=[C:5]([CH:10]=[C:11]([N:19]([CH3:21])[CH3:20])[C:12]=1[N:13]1[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]1)[C:6](OC)=[O:7].O1CCCC1.[H-].[Al+3].[Li+].[H-].[H-].[H-]>C(OCC)(=O)C>[CH3:1][N:2]([CH3:22])[C:3]1[CH:4]=[C:5]([CH:10]=[C:11]([N:19]([CH3:21])[CH3:20])[C:12]=1[N:13]1[CH2:18][CH2:17][CH2:16][CH2:15][CH2:14]1)[CH2:6][OH:7]A solution of 25 g. of methyl 3,5-bis(dimethylamino)-4-piperidinobenzoate in 150 ml. of absolute tetrahydrofuran was added dropwise to a solution of lithium aluminum hydride in 300 ml. of absolute tetrahydrofuran, and the mixture was boiled under reflux for 3 hours. After cooling, the excess lithium aluminum hydride was cautiously decomposed with 100 ml. of ethyl acetate and then with 3 ml. of water and the solution evaporated to dryness. The residue was taken up in water, the oily product extracted with ethyl acetate and the ethyl acetate solution dried and evaporated. After recrystallization from high-boiling petroleum ether, there was obtained 3,5-bis(dimethylamino)-4-piperidinobenzyl alcohol having a melting point of 90°-92° C.
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