反应详情

A mixture of cyclohexanethiocarboxamide (5.0 g), ethyl 4-chloroacetoacetate (5.74 g), ethanol (50 ml) was heated under reflux for 1 hour. After dilution with water, mixture was extracted with ethyl acetate. The extract was washed with aqueous sodium bicarbonate solution and water, dried (MgSO4), and concentrated. The residue was purified by chromatography on silica gel with ethyl acetate-hexane (1:4) to yield ethyl 2-cyclohexyl-4-thiazoleacetate as an oil (6.3 g, 70.9%). IR (Neat): 1735, 1255 cm-1. NMR (CDCl3)δ: 1.28 (3H, t, J=7 Hz), 1.2-2.3 (10H, m), 2.97 (1H, m), 3.77 (2H, s), 4.17 (2H, q, J=7 Hz), 7.0 (1H, s).

1. temperaturewas heated
2. temperatureunder reflux for 1 hour
3. extractionAfter dilution with water, mixture was extracted with ethyl acetate
4. washThe extract was washed with aqueous sodium bicarbonate solution and water
5. dry with materialdried (MgSO4)
6. concentrationconcentrated
7. customThe residue was purified by chromatography on silica gel with ethyl acetate-hexane (1:4)