Hydrochloric Acid → 10-carboxy-5-(3-pyridylmethyl)-4H-pyrido [3,2,1-jk]carbazole-4-one

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Reaction Steps

Sodium hydroxide (300 mg) was dissolved in water (15 ml), and bromine (0.1 ml) was added dropwise to the solution in an ice bath. The solution was diluted with dioxane (14 ml). 10-acetyl-5- (3-pyridylmethyl) -4H-pyrido [3,2,1-jk]carbazole-4-one (190 mg) produced in Example 194 was dissolved in dioxane (30 ml), and the solution that had been prepared as described above was added dropwise to this solution in an ice bath. After stirring for 5 minutes, sodium sulfite (70 mg) dissolved in water (10 ml) was added to the solution, and ether was added for phase separation. The aqueous layer was adjusted to pH 7 by adding 1N hydrochloric acid, and the crystals precipitated were recovered by filtration and washed with methanol and acetone in succession to obtain the title compound (67 mg, 35%).

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