反应详情

A benzene (10 mL) solution of 2-thiazole carboxaldehyde (5.00 g 44.19 mmol), ethylene glycol (7.40 mL, 132.58 mmol) and p-toluenesulfonic acid monohydrate (1.50 g, 7.89 mmol) was refluxed with azeotropic removal of H2O for 3 h and then cooled to ambient temperature. The reaction mixture was diluted with Et2O and the organics washed with sat'd NaHCO3, brine and then dried (MgSO4), filtered and concentrated to provide the title compound as a reddish oil. 1H NMR (CDCl3, 400 MHz) δ 7.79 (d, J=3.1 Hz, 1H), 7.35 (d, J=3.1 Hz, 1H), 6.13 (s, 1H), 4.16–4.01 (m, 4H).

1. washthe organics washed with sat'd NaHCO3, brine
2. dry with materialdried (MgSO4)
3. filtrationfiltered
4. concentrationconcentrated