Triethylamine → 1'-[(6-Chloro-1H-indol-3-yl)carbonyl]spiro[isoindole-1,4'-piperidin]-3(2H)-one

Participants

Reaction Steps

To a solution of 0.060 g (0.31 mmol) 6-chloro-1H-indole-3-carboxylic acid in 3 ml dichloromethane were added 0.045 ml (0.38 mmol) 1-chloro-N,N,2-trimethyl-propenylamine at room temperature. After stirring for 1 h the reaction mixture was concentrated in vacuo. The residue was redissolved in 2 ml dry N,N-dimethylformamide. A solution of 0.062 g (0.31 mmol) spiro[isoindole-1,4′-piperidin]-3(2H)-one and 0.064 ml (0.46 mmol) triethylamine in 1 ml dry N,N-dimethylformamide was added at room temperature. After stirring for 2 h the reaction mixture was quenched with 1 M aqueous sodium hydroxide solution (30 ml) and extracted with ethyl acetate (3×50 ml). The combined organic layers were washed with water (2×30 ml), 0.5 M aqueous hydrochloric acid solution (1×30 ml) and brine (1×30 ml), dried over sodium sulfate and concentrated in vacuo. The crude product was triturated in warm diethyl ether, filtrated and dried in vacuo to give the title compound (0.031 g, 22%) as light brown solid with a purity of approx. 80% by LC-.MS.

Provenance & Evidence