3'-Ethoxy-3-nitrobiphenyl-4-acetic acid → 6-(3-Ethoxyphenyl)indolin-2-one

Participants

Reaction Steps

Iron chips (2.4 g) were added in one portion to 4.6 g of 3′-ethoxy-3-nitrobiphenyl-4-acetic acid in glacial acetic acid (40 ml). The mixture was refluxed for 2 hours. The reaction mixture was cooled and concentrated to dryness. The residue was treated repeatedly with ethyl acetate and filtered to remove insolubles. The filtrate was washed twice with 1 N hydrochloric acid and brine, dried over anhydrous sodium sulfate and concentrated to give 3.5 g (91%) of 6-(3-ethoxyphenyl)-2-oxindole as a light brown solid.

Provenance & Evidence