Boron trifluoride etherate → HCID 23401463, compound

Participants

Reaction Steps

To a solution of 4-bromo-7-methyl tryptophol (400 mg g, 1.47 mmol) and ethyl butyrylacetate (0.28 mL, 1.76 mmol) in CH2Cl2 (5 mL) was added BF3.OEt2 (0.22 mL, 1.76 mmol) dropwise at room temperature. The solution was stirred for 2 hours and then washed with saturated aqueous NaHCO3 (5 mL) and brine (5 mL). The organic phase was dried (Na2SO4) and concentrated. The residue was purified by flash chromatography (silica, 15% EtOAc in hexanes) to give 496 mg (82%) of title compound as a pale yellow solid. Mp=137–138° C.; 1H NMR (CDCl3): 300 MHz δ 9.73 (bs, 1H), 6.76 (d, J=10.1 Hz, 1H), 4.21 (m, 2H), 4.05 (m, 1H), 3.91 (m, 1H), 3.05–2.89 (m, 4H), 2.53 (s, 3H), 2.07 (m, 1H), 1.92 (m, 1H), 1.38 (m, 1H), 1.30 (t, J=6.98 Hz, 3H), 1.21 (m, 1H), 0.89 (t, J=7.08 Hz, 3H).

Provenance & Evidence