反应详情

In 30 ml of acetonitrile was suspended 3.5 g of 1-benzylidene-2-[4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl]-4-(2,2-dimethoxyethyl)semicarbazide produced in Working Example 2. To the suspension was added 0.7 g of 35% hydrochloric acid, and the reaction was allowed to proceed for one hour at room temperature. After completion of the reaction, the reaction mixture was cooled for 30 minutes at temperatures ranging from 0 to 10° C., then resulting crystalline precipitate was collected by filtration to afford 2.3 g of the titled compound as colorless crystals, m.p. 166-167° C.

1. customproduced in Working Example 2
2. customAfter completion of the reaction
3. temperaturethe reaction mixture was cooled for 30 minutes at temperatures
4. customranging from 0 to 10° C.
5. filtrationresulting crystalline precipitate was collected by filtration