Diethyl (ethoxymethylene)malonate → 10-bromo-5-ethoxycarbonyl-2-methoxy-4H-pyrido [3,2,1-jk]carbazole-4-one

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Reaction Steps

3-bromo-6-methoxycarbazole (2.5 g) produced in Example 1, step 1 and diethyl ethoxymethylenemalonate (9.16 ml) were dissolved in xylene, and the solution was heated under reflux in an argon atmosphere for 120 hours, and allowed to cool. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (eluent: chloroform) to obtain the title compound (2 g, 50%).

Provenance & Evidence