Methyl 5'-fluoro-2'-nitrobiphenyl-2-carboxylate → 2-fluoro-5-hydroxyphenanthridin-6(5H)-one

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Reaction Steps

To a solution of the product of Example 37a (methyl 5′-fluoro-2′-nitrobiphenyl-2-carboxylate, 56.79 mg, 0.206 mmol) in methanol (9 mL) was added 10% palladium on carbon (15.6 mg, 0.015 mmol). The flask was fitted with a hydrogen balloon and de-gassed three times with hydrogen. The reaction mixture was stirred, diluted with dimethylformamide, and filtered. The filtrate was concentrated to provide 2-fluoro-5-hydroxyphenanthridin-6(5H)-one (37b, 46.36 mg, 0.202 mmol, 98% yield).

Provenance & Evidence