Methanol → 7-Chloro-1-(hydroxymethyl)-5-methyl-3-phenyl-3,5-dihydro-4H-pyridazino[4,5-b]indol-4-one

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Reaction Steps

2.5 g (66.1 mmol) of sodium borohydride are added to a solution of 4.04 g (10.6 mmol) of ethyl 7-chloro-5-methyl-4-oxo-3-phenyl-3,5-dihydro-4H-pyridazino[4,5-b]-indole-1-carboxylate in 150 ml of tetrahydrofuran. 2.25 ml of methanol are gradually added, with stirring, and then the mixture is heated at reflux for 5 hours. The mixture is poured onto an ice-cold 1 M hydrochloric acid solution and an insoluble product is separated by filtration on sintered glass, which product is washed with water and with diethyl ether and then dried. 3.3 g (9.7 mmol) of compound are isolated in the form of a white solid which is used as is in the following stage.

Provenance & Evidence