[CH2:1]1[C:11]2[N:10]3[C:12]4[CH:21]=[CH:20][N:19]=[CH:18][C:13]=4[C:14]4[CH2:15][CH2:16][CH:17]=[C:8]([C:9]=43)[CH:7]=[CH:6][C:5]=2[CH2:4][CH2:3][CH2:2]1.Br[CH2:23][CH:24]=[CH2:25].C(=O)(O)[O-].[Na+].CN(C)C=O>O>[CH2:25]([CH:3]1[CH2:4][C:5]2[CH:6]=[CH:7][C:8]3[C:9]4[N:10]([C:12]5[CH:21]=[CH:20][N:19]=[CH:18][C:13]=5[C:14]=4[CH2:15][CH2:16][CH:17]=3)[C:11]=2[CH2:1][CH2:2]1)[CH:24]=[CH2:23]A mixture of 3.3 g. of the product of Example 1, 1.45 g. of freshly distilled 3-bromopropene and 1.7 g. of sodium bicarbonate is stirred at room temperature, for 24 hours, in 50 ml. dimethylformamide. At the end of this period, the mixture is poured into water, extracted with ether, and the combined extracts are dried and stripped down. The residue is dissolved in benzene, and the resulting solution chromatographed through a column of neutral alumina. The oily residue obtained on stripping down the eluate is recrystallized from isopropyl alcohol to yield 3-allyl-1,2,3,4,8,9-hexahydropyrido[4',3':2,3]indolo[1,7-ab][1]benzazepine m.p. 112°-113°.
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