Sodium Hydroxide → 3-(1-Ethoxy-1-phenyl-methylidene)-5-phenylsulphonylamino-2-indolinone

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Reaction Steps

8 ml of 4 N sodium hydroxide solution are added to a solution of 4.0 g (8 mmol) of 1-acetyl-3-(1-ethoxy-1-phenyl-methylidene)-5-(N-acetyl-N-phenylsulphonyl-amino)-2-indolinone (Example 1e) in a mixture of 20 ml of dichloromethane and 20 ml of ethanol and the resulting mixture is stirred for 20 minutes at ambient temperature. It is then evaporated down to about. 10 ml and 150 ml of water are added. The pH is adjusted to 8–9 with 1 N hydrochloric acid. The precipitate formed is suction filtered, washed with water, isopropanol and ether, then dried in vacuo.

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