Reaktion #4496

Reaktionsgleichung

cyclohexanethiocarboxamide

ethyl 4-chloroacetoacetate

→

ethyl 2-cyclohexyl-4-thiazoleacetate

Ausbeute 71.3%

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas heated
2. 2
   Temperaturunder reflux for 1 hour
3. 3
   ExtraktionAfter dilution with water, mixture was extracted with ethyl acetate
4. 4
   WaschenThe extract was washed with aqueous sodium bicarbonate solution and water
5. 5
   Trocknendried (MgSO4)
6. 6
   Einengenconcentrated
7. 7
   SonstigeThe residue was purified by chromatography on silica gel with ethyl acetate-hexane (1:4)

Vorschrift

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).

Quelle