Triethylamine → 1-Boc-piperidine-3-carboxaldehyde

Participants

Reaction Steps

1-BOC-3-hydroxymethylpiperidine (2.15 g, 10 mmol) and triethylamine (3.03 g, 30 mmol) were dissolved in 10 mL DMSO, 15 mL DMSO solution of SO3Py (4.77 g, 30 mmol) was added to the above mixture in dropwise and the result mixture was stirred at rt for 2 hrs. The mixture was poured into 100 mL ice-water, extracted with EtOAc (100 mL×3), organic layer was washed with brine, dried with Na2SO4, filtered, and the filtrate was evaporated in vacuo. The crude product was purified by chromatography on silica gel (PE/EtOAc 5:1) to give 1.46 g product as colorless oil (68.5%). 1H NMR (300 MHz, CDCl3) δ: 9.70 (1 H, s), 3.91-3.93 (1 H, m), 3.62-3.67 (1 H, m), 3.29-3.36 (1 H, m), 3.05-3.13 (1 H, m), 2.40-2.45 (1 H, m), 1.95-1.97 (1 H, m), 1.63-1.72 (1 H, m), 1.49-1.59 (1 H, m), 1.46 (9 H, s).

Provenance & Evidence