Diisopropylethylamine → HCID 18412092, compound

Participants

Reaction Steps

To indole-3-glyoxylyl chloride I (3 gram, 14.45 mmol) in CH2Cl2 at room temperature was added tert-butyl 1-piperazinecarboxylate (2.7 gram, 14.45 mmol) and diisopropylethylamine (2.76 ml, 15.9 mmol). The light-brown color solution was stirred for 2 hr at room temperature after which time LC/MS analysis indicated the completion of the reaction. The solvent was removed in vacuo and the resulting residue was diluted with ethyl acetate (250 ml) and diethylether (250 ml). The organic solution was then washed with water (100 ml×3) and brine (50 ml), dried over MgSO4, filtered and concentrated. To the light-yellow solid was then added 30 ml of 20% trifluoroacetic acid in CH2Cl2. The solution was concentrated and the light-brown solid was dried in vacuo to give 3.5 g (95%) of product II. LC/MS analysis indicated this product was 100% pure and it was used for the next reaction without further purification.

Provenance & Evidence