[C:1]([C:3]1[CH:23]=[CH:22][C:6]([CH2:7][N:8]=C(C2C=CC=CC=2)C2C=CC=CC=2)=[CH:5][CH:4]=1)#[N:2].[CH:24]([N-]C(C)C)(C)C.[Li+].C(NC(C)C)(C)C.C([Li])CCC.CI>CCCCCC.CCOCC.O.O1CCCC1>[C:1]([C:3]1[CH:4]=[CH:5][C:6]([CH:7]([NH2:8])[CH3:24])=[CH:22][CH:23]=1)#[N:2]
20.7 g (0.07 mmol) of N-(p-cyanobenzyl)benzophenone imine were added dropwise to a solution of lithium diisopropylamide prepared from 8.15 g (0.08 mol) of diisopropylamine and 48.3 ml (0.08 mol) of 15% strength solution of butyllithium in hexane—in 100 ml of abs. tetrahydrofuran, at −70° C., and the mixture was stirred for 15 minutes. Then 9.94 g (0.07 mol) of methyl iodide were added dropwise, and the temperature of the reaction mixture was allowed to rise to room temperature. After addition of 100 ml of water and extraction several times with ether, the ether phase was washed with 5% strength citric acid solution, 5% strength NaHCO3 solution and water and dried over Na2SO4, and the ether was distilled off. The residue was dissolved in 150 ml of tetrahydrofuran, 100 ml of 1N HCl were added, and the mixture was stirred at room temperature overnight. The tetrahydrofuran was distilled out of the reaction mixture under reduced pressure, the remaining acid phase was extracted several times with ether to remove the benzophenone, then the acid phase was made alkaline with aqueous K2CO3 solution while cooling in ice, and the oily base was extracted with methylene chloride. The extract was dried over K2CO3. After the methylene chloride had been stripped off, 9.7 g (95%) of a yellowish oil remained and was used without further purification in the next reaction.
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