Dimethylformamide → 5-[4-(Allyl-methyl-amino)-butoxy]-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester

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Reaction Steps

8.8 g (24 mmol) 5-(4-Bromo-butoxy)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester in 10 ml DMF were treated with 7.11 g (100 mmol) N-allylmethylamine at 50° C. for 4 h. The solution was concentrated in vacuo, and the residue was redissolved in ether and water. 2M NaOH was added and the inorganic phase was extracted with ether. The combined organic phases were washed with water, dried over Na2SO4 and evaporated. Column chromatography with a gradient of CH2Cl2/MeOH 19:1 to 9:1 yielded 7.4 g (85%) 5-[4-(Allyl-methyl-amino)-butoxy]-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester as colorless oil, MS: 361 (MH+).

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