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To a solution of THF (20 mL), 2-(3-bromophenyl)-1,3-dioxolane (2.7 g) and 1,2-dibromoethane (150 mg) was added magnesium (270 mg), which was heated to reflux for 10 minutes. The reaction mixture was cooled to 0° C., and a solution of 5-methyl-2-thiophencarbaldehyde (1.0 g) and THF (5 mL) was added thereto under stirring. The reaction solution was returned to room temperature and stirred for 10 minutes. Water was added to the reaction solution, which was then extracted with ethyl acetate. The solvent was evaporated from the organic layer under a reduced pressure, and the residue was purified by silica gel chromatography (heptane:ethyl acetate=2:1) to obtain the titled compound (1.1 g).

1. temperaturewas heated
2. temperatureto reflux for 10 minutes
3. customwas returned to room temperature
4. stirringstirred for 10 minutes
5. extractionwas then extracted with ethyl acetate
6. customThe solvent was evaporated from the organic layer under a reduced pressure
7. customthe residue was purified by silica gel chromatography (heptane:ethyl acetate=2:1)