Sodium Hydroxide → 1-(2-Chloro-4,5-difluorobenzoyl)-3-(5-amino-2-methoxyphenyl)urea

Participants

Reaction Steps

2.2 g (5.7 mmol) of 1-(2-chloro-4,5-difluorobenzoyl)-3-(2-methoxy-5-nitrophenyl)urea were heated to the boiling temperature in 50 ml of ethyl acetate and admixed with 6.4 g (28.5 mmol) of SnCl2 monohydrate. After 1 hour, the mixture was allowed to cool to room temperature and the pH was adjusted to 8 using 2 N sodium hydroxide solution. The precipitate which formed was filtered off and washed with methanol, and the mother liquor was washed twice with H2O, dried and concentrated under reduced pressure. The resulting product (1.4 g) was reacted in step d without further purification.

Provenance & Evidence