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In a stream of argon, in 10 ml of tetrahydrofuran was dissolved 500 mg (1.80 mmol) of 2-[2-(2,4,6-trimethoxyphenyl) vinyl]thiophene, and 1.27 ml of n-butyllithium (1.6 M solution in hexane) (2.03 mmol) was added dropwise thereto under cooling. The mixture was stirred for 1 hour. To this mixture, 0.16 ml (2.00 mmol) of N,N-dimethylformamide was added dropwise and reacted. After reacted at gradually increasing temperature, the reaction mixture was stirred at room temperature for 12 hours. The mixture was poured into 50 ml of ice water and subjected to 3 times of extraction with 200 ml of chloroform. The extract was washed with a saturated saline solution, dried over anhydrous magnesium sulfate, and concentrated. The residue was purified by silica gel chromatography to give 380 mg (yield: 69%) of 5-[2-(2,4,6-trimethoxyphenyl)vinyl]thiophene-2-carbaldehyde as a light yellow crystal.

1. additionwas added dropwise
2. temperatureunder cooling
3. customreacted
4. customAfter reacted
5. temperatureat gradually increasing temperature
6. stirringthe reaction mixture was stirred at room temperature for 12 hours
7. extractionsubjected to 3 times of extraction with 200 ml of chloroform
8. washThe extract was washed with a saturated saline solution
9. dry with materialdried over anhydrous magnesium sulfate
10. concentrationconcentrated
11. customThe residue was purified by silica gel chromatography