C([N:5]([C:15](=[O:24])[C:16]1[CH:21]=[C:20]([CH3:22])[CH:19]=[C:18]([CH3:23])[CH:17]=1)[NH:6][C:7](=O)[C:8]1C=CC=C[CH:9]=1)(C)(C)C.[H-].[Na+].C(Br)C#C>CN(C)C=O.C(OCC)(=O)C>[CH2:7]([NH:6][NH:5][C:15](=[O:24])[C:16]1[CH:17]=[C:18]([CH3:23])[CH:19]=[C:20]([CH3:22])[CH:21]=1)[C:8]#[CH:9]To a stirred suspension of N'-t-butyl-N-benzoyl-N'-(3,5-dimethylbenzoyl)hydrazine (1.5 g) in dimethylformamide (DMF) (20 ml) was added sodium hydride (200 mg of 60% oil dispersion) portionwise. After 15 min., propargyl bromide (0.6 g) was added to the reaction mixture dropwise and the reaction stirred for 1 hour. The reaction mixture was diluted with ethyl acetate (50 ml) and washed with water (5×20 ml). The organic layer was then dried over magnesium sulfate and the solvent removed under vacuum to afford N-(2-propynyl)-N'-(3,5-dimethylbenzoyl)hydrazine as a yellow amorphous solid. The product, N-(2-propynyl)-N'-t-butyl-N-benzoyl-N'-(3,5-dimethylbenzoyl)hydrazine, was purified by column chromatography on silica gel (solvent system: methylene chloride) to afford a 70% yield as a white solid.
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