2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 9-[(Phenyl)methyl]-2-methyl-4-hydroxy-5-carbomethoxy carbazole

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Reaction Steps

A solution of the 9-[(phenyl)methyl]-5-carbomethoxy-2-methyl-1,2-dihydrocarbazol-4(3H)-one (1.30 g, 3.74 mM) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (0.93 g, 4.12 mM) in 37 mL of toluene was stirred between 80-90° C. for 5 hours. The mixture was purified by column chromatography on silica gel (elution with methylene chloride) to afford 270 mg (21%) of the 9-[(phenyl)methyl]-2-methyl-4-hydroxy-5-carbomethoxy carbazole. 1H NMR (CDCl3) δ10.45 (s, 1H), 8.0 (d, J=8 Hz, 1H), 7.55 (d, J=8 Hz, 1H), 7.4 (dd, J=8 and 8 Hz, 1H), 7.3 (m, 3H), 7.05 (m, 2H), 6.65 (s, 1H), 6.6 (s, 1H), 5.5 (s, 2H), 4.1 (s, 3H), 2.45 (s, 3H). MS (ES) m/e 314, 346.

Provenance & Evidence