Triethylamine → Z-6-chloro-3-cyclohexylmethylene-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-cyclohexylmethylene-1,3-dihydro-indol-2-one (2.71 g, 10.4 mmol) was reacted with ethyl chloroformate (1.47 mL, 15.6 mmol) and triethylamine (2.89 mL, 20.7 mmol) in dichloromethane to give E/Z-6-chloro-3-cyclohexylmethylene-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester as a brown solid (Yield 3.3 g, 95%).

Provenance & Evidence