Réaction #6005

Équation de réaction

methyl isothiocyanate

(±)-2-(quinolin-3-yl)cyclohexanone

potassium t-butoxide

→

(±)-N-methyl-2-oxo-1-(quinolin-3-yl)cyclohexanecarbothioamide

Rendement 9.4%

Solvants

tetrahydrofuran

tetrahydrofuran

Conditions de réaction

Traitement

1. 1
   AutreAfter 4 hours at 0° C. the reaction mixture was partitioned between saturated aqueous ammonium chloride solution (50 ml) and chloroform (50 ml)
2. 2
   ExtractionThe aqueous layer was extracted again with chloroform (50 ml)
3. 3
   SéchageThe combined organic extracts were then dried over sodium sulphate
4. 4
   Concentrationconcentrated in vacuo (20° C.; 14 mmHg)
5. 5
   Autreto give a crude oil which
6. 6
   Autrewas purified by flash chromatography over silica gel eluting with ethyl acetate

Mode opératoire

A solution of (±)-2-(quinolin-3-yl)cyclohexanone (0.78 g, 3.5 mmol) in tetrahydrofuran (10 ml) at -5° C. was treated with potassium t-butoxide (0.43 g, 3.9 mmol) in one portion. After 25 minutes at -5° C. the deep red mixture was treated dropwise during 1 minute with a solution of methyl isothiocyanate (0.28 g, 3.9 mmol) in tetrahydrofuran (2 ml). After 4 hours at 0° C. the reaction mixture was partitioned between saturated aqueous ammonium chloride solution (50 ml) and chloroform (50 ml). The aqueous layer was extracted again with chloroform (50 ml). The combined organic extracts were then dried over sodium sulphate and concentrated in vacuo (20° C.; 14 mmHg) to give a crude oil which was purified by flash chromatography over silica gel eluting with ethyl acetate to give (±)-N-methyl-2-oxo-1-(quinolin-3-yl)cyclohexanecarbothioamide (0.1 g, 0.33 mmol), m.p. 235°-236° C.;

Source