Dimethyl Sulfoxide → (S)-(1,4-dibenzyl-piperazin-2-yl)-acetaldehyde

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Reaction Conditions

Reaction Steps

Add anhydrous DMSO (3.57 mL, 50.25 mmol) in anhydrous dichloromethane (68.0 mL). Cool to −78° C. and stir. Add oxalyl chloride (2M in dichloromethane, 12.06 mL, 24.125 mmol) dropwise. Stir at −78° C. for 30 minutes. Add (1,4-dibenzyl-piperazin-2-yl)-ethanol (6.241 g, 20.1 mmol) in dichloromethane (12.0 mL) and stir. After 1 hour, add triethylamine (14.01 mL, 100.5 mmol) and stir for another 1 hour. Allow the reaction mixture gradually warm to ambient temperature. Add saturated ammonium chloride. (200 mL). Exact aqueous portion with ethyl acetate three times. Combine the organic solution, dry over sodium sulfate, filter, and concentrate under reduced pressure to give crude residue. Purify the residue by flash chromatography, eluting with 2M ammonia in methanol:dichloromethane (5:95) to give the title compound: mass spectrum (m/e):309.03 (M+1).

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