反应详情

A mixture of methyl [3-cyclohexyl-2-(cyclohexylimino)-4-oxo-5-thiazolidinylidene]acetate (5.0 g, 14 mmoles) and anhydrous lithium iodide (7.6 g, 57 mmoles) in N,N-dimethylformamide (30 mls) is heated under argon to reflux. After six hours the mixture is cooled, diluted with water, acidified with 4N HCl, and extracted twice with dichloromethane. The combined extracts are washed with brine and dried over MgSO4. The solvent is removed to afford a syrupy residue which evenually crystallizes. Recrystallization from acetonitrile gave the product (3.2 g), mp 189°-190° C.

1. temperatureis heated under argon
2. temperatureto reflux
3. temperatureAfter six hours the mixture is cooled
4. extractionextracted twice with dichloromethane
5. washThe combined extracts are washed with brine
6. dry with materialdried over MgSO4
7. customThe solvent is removed
8. customto afford a syrupy residue which
9. customevenually crystallizes
10. customRecrystallization from acetonitrile