反应详情

温度

50 °C

A mixture of the resulting thiourea (1.09 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (509 mg, 2.65 mmol), and triethylamine (0.37 mL) in tetrahydrofuran (10 mL) was stirred at 50° C. for 3 hr. The mixture was diluted with saturated aqueous sodium hydrogen carbonate, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 30-80% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the title compound as a colorless solid (510 mg, 1.22 mmol, 28% in 2 steps).

1. extractionextracted with ethyl acetate
2. washThe combined organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography on silica gel eluting with a 30-80% ethyl acetate/n-hexane gradient mixture
7. concentrationThe filtrate was concentrated in vacuo