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In 20 ml of N,N-dimethylformamide were dissolved 1.63 g (4.59 mmol) of 2-benzyloxy-4-[butyl(4-hydroxybutyl)amino]benzaldehyde and 1.2 g (17.63 mmol) of imidazole. To this mixture, 1.27 g (4.62 mmol) of tert-butylchlorodiphenylsilane was added dropwise with stirring at room temperature. The mixture was stirred for 2 hours. After the reaction mixture was poured into water, extraction with ethyl acetate, washing with a saturated saline solution, and drying over anhydrous sodium sulfate were performed. The residue was purified by silica gel column chromatography to give 2.08 g of a colorless oily matter (yield: 76.5%).

1. stirringThe mixture was stirred for 2 hours
2. washwashing with a saturated saline solution
3. dry with materialdrying over anhydrous sodium sulfate
4. customThe residue was purified by silica gel column chromatography
5. customto give 2.08 g of a colorless oily matter (yield: 76.5%)