反应详情

温度

50 °C

A mixture consisting of thiourea (858.4 g, 11.28 mol), benzyl bromide (1,930 g, 11.28 mol), THF (9000 ml), and water (3000 ml) was heated at reflux temperature for 2 hr followed by cooling to 50° C. To this solution was added 3-acetyl-2,5-dichlorothiophene (2000 g, 10.25 mol) and an aqueous solution of sodium hydroxide (2,200 g of 50% NaOH diluted to 3000 ml); this mixture was heated at reflux temperature for 4 hr, cooled to room temperature, and the two layers separated. The organic layer was diluted with ethyl acetate (6000 ml) and washed with water (3×2000 ml) and saturated aqueous sodium chloride, dried (MgSO4) and the solvent evaporated to give a residue which was triturated with hexane. This solid was collected by filtration and dried to give the desired product (2,550 g, 88%): mp 86°-88° C.

1. temperaturewas heated
2. temperatureat reflux temperature for 2 hr
3. temperaturethis mixture was heated
4. temperatureat reflux temperature for 4 hr
5. temperaturecooled to room temperature
6. customthe two layers separated
7. additionThe organic layer was diluted with ethyl acetate (6000 ml)
8. washwashed with water (3×2000 ml) and saturated aqueous sodium chloride
9. dry with materialdried (MgSO4)
10. customthe solvent evaporated
11. customto give a residue which
12. customwas triturated with hexane
13. filtrationThis solid was collected by filtration
14. customdried