[CH3:1]C(C)([O-])C.[K+].[CH3:7][N:8]1[CH2:15][CH:14]2[C:16](=O)[CH:10]([CH2:11][CH2:12][CH2:13]2)[CH2:9]1.CCOCC>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.C1(C)C=CC=CC=1>[CH3:7][N:8]1[CH2:15][CH:14]2[C:16](=[CH2:1])[CH:10]([CH2:11][CH2:12][CH2:13]2)[CH2:9]1To a solution of 6.9 g of methyltriphenyl phosphonium bromide in toluene (30 ml) was added 2.2 g of potassium tert-butoxide at 0° C. and the resulting mixture was stirred for 30 minutes. Next, 3.0 g of 3-methyl-3-azabicyclo[3.3.1]nonan-9-one was added thereto and the mixture was reacted for 1 hour. After adding ether, the reaction mixture was washed with a saturated aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. After filtering and concentrating, the residue was purified by silica gel column chromatography (eluted with ether/n-hexane) to thereby give 3.1 g of the title compound as a yellow oily substance.
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