Hydrochloric Acid → Ethyl 2-benzoyl-6chloro-3-[(methoxycarbonyl)amino]-1H-indole-1-caboxylate

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Reaction Steps

To a solution of ethyl 3-amino-2-benzoyl-6-chloro-1H-indole-1-caboxylate (step 2, 1.5 g, 4.4 mmol) and pyridine (0.50 ml, 6.6 mmol) in dichloromethane (20 ml) was added methyl chloroformate (0.40 ml, 5.3 mmol) at room temperature. After stirring for 3 h, the mixture was poured into 2N aqueous HCl (20 ml) and extracted with dichloromethane (30 ml×2). The combined organic layers were dried (MgSO4) and concentrated to give 1.7 g (quant.) of the title compound as yellow amorphous solids.

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