Triethylamine → HCID 58215574, compound

Participants

Reaction Steps

To a solution of 5-fluoro-2-pyridin-3-yl-indole (Example 3, 0.100 g, 0.452 mmol) in DMF (1 mL) is added triethylamine (0.083 g, 0.814 mmol), DMAP (0.006 g, 0.045 mmol) and di-tert-butyl carbonate (0.120 g, 0.543 mmol). After 15 h, the mixture is diluted with ethyl acetate and washed with water. The organic phase is dried over MgSO4, filtered and the filtrate is concentrated in vacuo to give a residue which is purified by silica gel chromatography (heptane-ethyl acetate, 9:1 to 4:1) to give 5-fluoro-2-pyridin-3-yl-indole-1-carboxylic acid tert-butyl ester as a yellow oil. Trituration with ether and heptane, followed by standing for several days affords a solid. 1H NMR (400 MHz, CDCl3) δ ppm 1.35 (s, 9H), 6.58 (s, 1H), 7.07-7.12 (m, 1H), 7.23 (dd, J=8.6, 2.5 Hz, 1H), 7.36 (dd, J=7.8, 5.1 Hz, 1H), 7.72-7.75 (m, 1H), 8.21 (dd, J=9.1, 4.9 Hz, 1H), 8.62 (dd, J=4.9, 1.5 Hz, 1H), 8.69 (d, J=1.5 Hz, 1H). MS (ESI) m/z 313 (M+H)+.

Provenance & Evidence