Triethylamine → Z-6-chloro-3-(4-chloro-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester

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Reaction Steps

In a manner similar to the method described in example 4b, E/Z-6-chloro-3-(4-chloro-benzylidene)-1,3-dihydro-indol-2-one (3.3 g, 11.3 mmol) was reacted with ethyl chloroformate (1.62 mL, 17.0 mmol) and triethylamine (3.16 mL, 22.6 mmol) in dichloromethane to give E/Z-6-chloro-3-(4-chloro-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester as a yellow solid (Yield 3.0 g, 73%).

Provenance & Evidence