反应详情

A suspension of L-proline (10.0 g, 87.0 mmol) and chloral hydrate (21.6 g, 130 mmol) in chloroform (100 mL) was heated at reflux for 6 h under a soxlet adapter charged with sodium sulfate. The cooled mixture was washed with water (2×), dried (MgSO4) and concentrated in vacuo. The product was recrystalised from boiling absolute ethanol to give the title compound as white needles (13.3 g, 63%). 1H NMR (400 MHz, CDCl3): 1.65-1.83 (1H, m), 1.86-2.01 (1H, m), 2.04-2.31 (2H, m), 3.06-3.18 (1H, m), 3.36-3.49 (1H, m), 4.12 (1H, dd, J 4.6, 4.0), 5.16 (1H, s).

1. temperaturewas heated
2. temperatureat reflux for 6 h under a soxlet adapter
3. washThe cooled mixture was washed with water (2×)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated in vacuo
6. customThe product was recrystalised