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

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Reaction Conditions

Reaction Steps

To 2.75 g (9 mmol) 5-(5-Hydroxy-pentyl)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester in 100 ml CH2Cl2, 0.87 ml (11 mmol) methanesulfonyl chloride and 3.8 ml (27 mmol) triethylamine were added at 0° C. The solution was concentrated in vacuo to yield crude 5-(5-Methanesulfonyloxy-pentyl)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester as yellow viscous oil, MS: 384 (MH+). The crude material was dissolved in 5 ml DMF and 5 ml (50 mmol) N-allylmethylamine. The mixture was heated to 80° C. for 3 h, concentrated and the residue was dissolved in water and ether, 2M NaOH was added and the inorganic phase was extracted with ether. The combined organic phases were washed with water and dried over Na2SO4. Column chromatography on silica gel with CH2Cl2: MeOH 9:1 yielded 2.5 g (72%) 5-[5-(Allyl-methyl-amino)-pentyl]-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester as colorless liquid, MS: 359 (MH+).

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