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In a stream of argon, to 20 ml of tetrahydrofuran was added 1.7 g of phenyllithium (19% solution in dibutylether) (3.83 mmol), and 1.38 g (3.49 mmol) of 2-thenyl triphenylphosphonium chloride was added thereto under ice cooling over 5 minutes. After the mixture was stirred for 10 minutes, 2.07 g (3.49 mmol) of 2-benzyloxy-4-[butyl[4-(tert-butyldiphenylsiloxy)butyl]amino]benzaldehyde dissolved in 50 ml of tetrahydrofuran was added dropwise thereto over 8 minutes. The mixture was stirred under ice cooling for 2 hours. After the reaction mixture was poured into water, extraction with ethyl acetate, washing with a saturated saline solution, drying over anhydrous sodium sulfate, and concentration were performed. The residue was purified by silica gel column chromatography to give 2.03 g of a light brown oily matter (yield: 86.4%).

1. additionwas added
2. additionwas added dropwise
3. waitover 8 minutes
4. stirringThe mixture was stirred under ice cooling for 2 hours
5. washwashing with a saturated saline solution
6. dry with materialdrying over anhydrous sodium sulfate, and concentration
7. customThe residue was purified by silica gel column chromatography
8. customto give 2.03 g of a light brown oily matter (yield: 86.4%)