Cl.[CH:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5][CH2:4][N:3]=1.[CH2:12]([C:14]([C:16]1[CH2:21][CH2:20][CH2:19][CH2:18][CH:17]=1)=[O:15])[CH3:13].O>C(O)C>[CH3:13][CH:12]1[CH:2]2[N:3]([CH2:4][CH2:5][C:6]3[CH:7]=[CH:8][CH:9]=[CH:10][C:11]=32)[CH:17]2[CH2:18][CH2:19][CH2:20][CH2:21][CH:16]2[C:14]1=[O:15]A mixture of 16.75 g (0.1 mole) of 3,4-dihydroisoquinoline hydrochloride and 28.0 g of (0.2 mole) of 1-cyclohexen-1-yl ethyl ketone in 28 ml of ethanol is refluxed for 52 hours then poured into 300 ml of water and extracted with ether. The aqueous layer is separated and made basic by slowly adding ammonium hydroxide solution with stirring. Stirring is continued until a solid is formed after which the liquid is decanted. The solid is washed with water, dissolved in methylene chloride, dried over sodium sulfate and concentrated to an oil. The oil is dissolved in refluxing hexane, filtered, concentrated and cooled to give a solid which is recrystallized from hexane-benzene to give 2,3,4,4a,6,7,11b,12,13,13a-decahydro-12-methyl-1H-dibenzo[a,f]quinolizin-13-one, M.P. 144.5°-147.5°C.
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