反应详情

A mixture of 3,5-di-tert-butyl-4-hydroxybenzaldehyde (30.0 g, 128 mmols), 2-thiohydantoin (14.8 g, 128 mmols), and sodium acetate (36 g) in acetic acid (200 ml) is stirred under nitrogen and heated to reflux. After 24 hours the mixture is allowed to cool, and is stirred into water (2 L). After an hour the product is filtered off, washed three times with water, and dried. Recrystallization from acetonitrile gave the 5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-2-thioxo-4-imidazolidinone (24.6 g), mp 278°-279° C. (dec).

1. temperatureheated to reflux
2. temperatureto cool
3. filtrationAfter an hour the product is filtered off
4. washwashed three times with water
5. customdried
6. customRecrystallization from acetonitrile