C[Si](C)(C)N[Si](C)(C)C.C([Li])CCC.CCCCCC.[C:21](#[N:23])[CH3:22].[CH:24]([CH:27]1[C:38](=[O:39])[C:37]2[C:36]3[O:35][C:34]([CH3:40])=[N:33][C:32]=3[CH:31]=[CH:30][C:29]=2[CH2:28]1)([CH3:26])[CH3:25]>O1CCCC1.[Cl-].[NH4+].C(OCC)(=O)C>[OH:39][C:38]1([CH2:22][C:21]#[N:23])[C:37]2[C:36]3[O:35][C:34]([CH3:40])=[N:33][C:32]=3[CH:31]=[CH:30][C:29]=2[CH2:28][CH:27]1[CH:24]([CH3:26])[CH3:25]
To a solution of 1,1,1,3,3,3-hexamethyldisilazane (917 mg, 5.68 mmol) in tetrahydrofuran (10 mL) was added 1.6M butyllithium/hexane solution (3.55 mL, 5.68 mmol) at −78° C., and the mixture was stirred for 15 min. Thereto was added a solution of acetonitrile (313 μL, 5.95 mmol) in tetrahydrofuran (2 mL), and the mixture was stirred for 30 min. Then, a solution of 7-isopropyl-2-methyl-6,7-dihydro-8H-indeno[5,4-d][1,3]oxazol-8-one (650 mg, 2.84 mmol) in tetrahydrofuran (2 mL) was added. After stirring for 30 min, the reaction solution was diluted with saturated aqueous ammonium chloride solution and ethyl acetate, washed with water and saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=20/80→100/0) to give the title compound (614 mg, yield 80%).
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