Triethylamine → HCID 46929287, compound

Participants

Reaction Steps

9-(2-Hydroxyethyl)-5-methoxy-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid diethylamine (11) (478 mg, 1.4 mmol) in dichloromethane (30 ml) was cooled to 0° C. and methanesulfonyl chloride (477 mg, 4.2 mmol, 324 μL) and triethylamine (420 mg, 4.2 mmol, 578 μL) were added and allowed to warm to RT overnight. The reaction was washed with 5% aqueous potassium carbonate solution. The layers were separated. The combined organics were dried over magnesium sulfate and concentrated in vacuo to give a gum (696 mg). The crude material was purified by silica gel chromatography eluting with petrol (A): ethyl acetate (B) (75-100% B, 22 CV, 120 g, 85 mL/min) to afford Methanesulphonic acid 2-(4-diethylcarbamyl-5-methoxy-1,2,3,4-tetrahydro-carbazol-9-yl)ethyl ester (precursor compound 5) as a gum that crystallised from diethyl ether to give 346 mg (59%) of a colourless solid. The structure was confirmed by 13C NMR (75 MHz; CDCl3): δC 13.1, 14.5, 20.0, 21.9, 28.0, 36.3, 36.7, 40.3, 41.8, 41.9, 54.7, 68.1, 100.0, 102.0, 109.0, 116.4, 122.0 135.1, 137.3, 153.8, and 174.6.

Provenance & Evidence