Triethylamine → 3-(4-Fluorophenyl)-5-(2-Phenylethynyl)-1H-Indazole

Participants

Reaction Steps

A mixture of 5-bromo-3-(4-fluorophenyl)-1-(tetrahydropyran-2-yl)-1H-indazole (0.375 g, 1.0 mmol), triethylamine (1.5 mL), tri-o-tolylphosphine (0.122 g, 0.4 mmol), tri(dibenzylideneacetone)dipalladium(0) (0.092 g, 0.1 mmol) and phenylacetylene (0.204 g, 2.0 mmol) in dried acetonitrile (10 mL) under nitrogen was heated to reflux overnight. It was quenched with water and extracted with ethyl acetate. The extracts were dried over magnesium sulfate, filtered, and concentrated. The residue was then purified by chromatography (SiO2, 10–15% ethyl acetate/hexane) to provide the title compound (0.127 g, 32% yield). 1H NMR (CDCl3) δ 8.16 (t, 1H), 7.93–7.97 (m, 2H), 7.54–7.64 (m, 4H), 7.34–7.37 (m, 3H), 7.21 (t, 2H) 5.77 (dd, 1H), 4.08 (m, 1H), 3.79 (m, 1H), 2.62 (m, 1H), 2.11–2.21 (m, 2H), 1.57–1.83 (m, 3H); ES-MS (m/z) 397 [M+1]+.

Provenance & Evidence