Water → 1-(3,4-Dichlorobenzyl)-2-(2-hydroxy-5-nitrobenzyl)-5-methylthio-1,2-dihydroindazol-3-one hydrate

Beteiligte Stoffe

Reaktionsschritte

3.6 g (11 mmol) of 1-(3,4-dichlorobenzyl)-5-methylthio-1H-indazol-3-ol are dissolved in 100 ml of DMSO and treated in portions with 0.34 g (13.2 mmol) of sodium hydride (95 percent). After stirring for 2 hours, a solution of 2.1 g (11 mmol) of 2-hydroxy-5-nitrobenzyl chloride in 20 ml of DMSO is added dropwise and the mixture is stirred at 60° C. for 3 hours. After cooling, 200 ml of water are added dropwise, the mixture is stirred for 4 hours and the solid is filtered off with suction. The precipitate is extracted by stirring with methanol whilst hot and recrystallized from 2-propanol.

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