Water → Ethyl 5-[(3,3-dimethylbutanoyl)amino]-1H-indole-2-carboxylate

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반응 단계

3.76 g (18.4 mmol) of ethyl 5-amino-1H-indole-2-carboxylate from Example LXI and 2.05 g (2.82 ml, 20.3 mmol) of triethylamine are added to 40 ml of THF. The mixture is cooled to 0° C., and a solution of 2.48 g (2.56 ml, 18.4 mmol) of 3,3-dimethylbutyryl chloride in 20 ml of THF are added. The mixture is stirred at RT for 2 h and, for work-up, poured into water. The pH is adjusted to 7 and the mixture is extracted 3 times with ethyl acetate. The combined organic phases are dried with sodium sulphate, filtered and dried under reduced pressure.

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