Triethylamine → HCID 69110469, compound

Participants

Reaction Steps

A mixture of racemic 5-ethyl-2-aminotetraline-2-carboxylic acid (765 mg, 3.49 mmole), triethylamine (1.0 ml, 7.17 mmole), 9-fluorenylmethyl succinimidyl carbonate (Fmoc-OSu, 1.79 g, 5.31 mmole) in acetonitrile (40 ml) and water (40 ml) was stirred at room temperature for 2 days. The reaction mixture was concentrated in vacuo to remove most of the acetonitrile, acidified to pH˜3 with 10% aqueous citric acid solution, and the white emulsion extracted twice with methylene chloride, twice with ethyl acetate. The methylene chloride extracts were washed with water, brine and dried over magnesium sulfate. The ethyl acetate extracts were washed with water, brine and dried over magnesium sulfate. Filtration and concentration gave a crude oil which was purified by column chromatography (eluted with 2→5→8% methanol/methylene chloride) to give racemic Fmoc-5-ethyl-2-aminotetraline-2-carboxylic acid (330 mg, 21% yield) as a white solid. HRMS (FAB): C28H28NO4 (M+H) calc. 442.2018; observed: 442.2010.

Provenance & Evidence