Hydrochloric Acid → 4-(2-Methyl-1,3-dioxolan-2-yl)benzaldehyde

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To a stirred solution of 2-(4-bromophenyl)-2-methyl-1,3-dioxolane (2.0 g, 8.23 mmol) in THF (7 ml) was added n-BuLi (1.61 M solution in hexane, 5.47 ml, 8.8 mmol) at −78° C. under nitrogen, and the mixture was stirred for 2 hour, then allowed to warm up to 0° C. for 30 min. A solution of 1-formylpiperidine (930 mg, 8.23 mmol) in THF (5 ml) was added, and the mixture was stirred for 2 hours. The mixture was made neutral by addition of 1N HCl solution, and the whole was extracted with diethylether. The organic layer was washed with saturated NaHCO3 aqueous solution, brine, dried over MgSO4, and concentrated in vacuo. The compound was used for next reaction without purification.

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