[Mg].Br[C:3]1[CH:12]=[C:11]2[C:6]([C:7]([CH3:15])([CH3:14])[CH2:8][CH2:9][N:10]2[CH3:13])=[CH:5][CH:4]=1.[CH:16](=[O:18])[CH3:17]>O1CCCC1>[CH3:17][CH:16]([C:3]1[CH:12]=[C:11]2[C:6]([C:7]([CH3:15])([CH3:14])[CH2:8][CH2:9][N:10]2[CH3:13])=[CH:5][CH:4]=1)[OH:18]2 g of Magnesium shavings were covered with 20 ml of tetrahydrofuran. A solution of 20.8 g of 7-bromo-1,2,3,4-tetrahydro-1,4,4-trimethylquinoline in 80 ml of tetrahydrofuran was added dropwise thereto at 55°-60° C. using an ultrasonics bath. Thereafter, the mixture was boiled at reflux for an additional 2 hours, cooled to 0° C. and a solution of 10 g of acetaldehyde in 80 ml of tetrahydrofuran was added dropwise thereto. After stirring at room temperature for 1 hour, the mixture was poured on to ice/saturated ammonium chloride solution and extracted with ether. The oil obtained after drying and evaporation of the solvent was filtered over a silica gel column (eluting agent hexane/ethyl acetate 9:1) and gave 14.5 g of 1,2,3,4-tetrahydro-α,1,4,4-tetramethyl-7-quinolinemethanol as a yellowish oil.
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