反应详情

温度

100 °C

To a suspension of 2-amino-4-methyl-5-(4-methylpyridin-2-yl)-thiazole (308 mg) and potassium carbonate (207 mg) in N,N-dimethylformamide (5 ml) was added N-cyano-N′,S-dimethylisothiourea (194 mg), and the mixture was stirred at 100° C. for 12 hours. The mixture was poured into water and extracted with ethyl acetate-tetrahydrofuran (2:1, 150 ml×2). The organic layer was washed with brine and evaporated under reduced pressure. The residue was purified by column chromatography (silica gel 10 g, 0 to 2% methanol in dichloromethane) to give 2,4-dicyano-1,3-dimethyl-5-(4-methyl-5-(4-methylpyridin-2-yl)thiazol-2-yl)biguanide (41 mg) as a mixture of regioisomers.

1. extractionextracted with ethyl acetate-tetrahydrofuran (2:1, 150 ml×2)
2. washThe organic layer was washed with brine
3. customevaporated under reduced pressure
4. customThe residue was purified by column chromatography (silica gel 10 g, 0 to 2% methanol in dichloromethane)