反应详情

A hot solution of potassium hydroxide (25.2 g) in water (70 ml) was added to N-(4-benzyloxyphenyl)thiourea (11.34 g) suspended in boiling water (80 ml). A hot solution of lead acetate trihydrate (71.5 g) in water (80 ml) was added and the mixture heated under reflux for an hour and filtered whilst hot. The filtrate was cooled, acidified to pH 7 with acetic acid and extracted with dichloromethane to give 4-benzyloxyphenylcyanamide as a white solid which was purified by flash chromatography (as described by Still et al in J Org Chem, 1978, 43, 2923-2925) over silica using hexane and chloroform as eluant to give 4-benzyloxyphenylcyanamide (m.p. 105° C.).

1. temperaturethe mixture heated
2. temperatureunder reflux for an hour
3. filtrationfiltered whilst hot
4. temperatureThe filtrate was cooled
5. extractionextracted with dichloromethane