反应详情

2.64 g (6.90 mmol ) 5,5-dimethyl-3-(3-nitro-4-isopropyl-phenyl)-1-pyridin-4-ylmethyl-imidazolidine-2,4-dione were dissolved in 50 ml acetic acid. 7.22 g zinc dust were added in portions while temperature was kept below 45° C. The mixture was stirred for 1 h at RT, then diluted with 100 ml water, made alkaline with 6N sodium hydroxide solution and extracted with methylene chloride. Separating zinc salts were removed by filtration over cellite. Evaporation of the combined organic phases yielded 1.53 g product that were used without further purification.

1. customwas kept below 45° C
2. extractionextracted with methylene chloride
3. customSeparating zinc salts were removed by filtration over cellite
4. customEvaporation of the combined organic phases