Dimethyl Sulfoxide → 1-Benzoylpiperidine-4-carbaldehyde

Participants

Reaction Steps

To 1.99 g of dimethyl sulfoxide in 45 ml CH2Cl2 at −78° C. was added 2.16 g of oxalyl chloride. After 10 min, 1.865 g of 4-hydroxymethyl-N-benzoyl piperidine (step B) in 15 ml of CH2Cl2 was added at −78° C. and stirred for 30 min. DIEA (5.49 mL) was added and this mixture was stirred for an additional 30 min. at −78° C. and then warmed to room temperature and stirred another 30 min. The reaction was quenched with 50 mL H2O and extracted with 3×50 ml CH2Cl2. The combined organic layers were dried over MgSO4 and evaporated under reduced pressure. The residue was chromatographed with 2:1 hexane:EtOAc, followed by 1:1 hexane: EtOAc to give 1.445 g of the title compound. 1H NMR (500 MHz) 1.72 (m, 2H), 1.90 (m, 1H), 2.14 (m, 1H), 2.58 (m, 1H), 3.21 (m, 2H), 3.68 (m, 1H), 4.41 (m, 1H), 7.39 (m, 5H), 9.72 (m, 1H).

Provenance & Evidence