[H-].[Na+].[CH3:3][NH:4][C:5](=[O:12])[C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1.Br[CH:14]1[CH2:20][CH2:19][CH2:18][CH2:17][CH:16]=[CH:15]1.O>CN(C)C=O>[CH3:3][N:4]([CH:20]1[CH2:19][CH2:18][CH2:17][CH2:16][CH:15]=[CH:14]1)[C:5](=[O:12])[C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1To a suspension (10 ml) of sodium hydride (0.24 g, 10 mmoles) in dimethylformamide was added dropwise at 0° C. a dimethylformamide solution (1 ml) of N-methylbenzamide (1.35 g, 10 mmoles). After completion of the addition, the temperature was raised to room temperature, and after stirring for 15 minutes, 3-bromocycloheptene (1.75 g, 10 mmoles) was added dropwise. The resulting mixture was stirred at room temperature for 24 hours, poured into water (20 ml) and extracted with ether. The oily product obtained by concentration was purified by chromatography on silica gel to obtain 0.92 g of N-methyl-N-(2-cycloheptenyl)benzamide [Compound (54)].
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