Sodium Carbonate → ethyl 3-(4-nitrophenyl)-1H-indole-2-carboxylate

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Reaction Steps

46 ml of a 1M sodium carbonate solution, 2.23 g of lithium chloride and then 1.1 g of tetrakis(triphenylphosphine)palladium are added successively, under argon and with stirring, to a solution of 5 g of ethyl 3-bromo-1H-indole-2-carboxylate and 7.8 g of 4-nitrophenylboronic acid in 110 ml of ethanol and 110 ml of toluene. The solution is refluxed for 2 hours 30 minutes and then concentrated under reduced pressure. The precipitate is filtered off and then recrystallized from ethanol, to give 5.1 g of ethyl 3-(4-nitrophenyl)-1H-indole-2-carboxylate, the characteristics of which are as follows:

Provenance & Evidence