Ethylurea → HCID 89650197, compound

Participants

Reaction Conditions

Reaction Steps

Compound ii (1.0 g, 3.7 mmol) and N-ethylurea (362 mg, 4.1 mmol) were dissolved in degassed dioxane (50 mL) under an atmosphere of argon. Potassium tert-butoxide (628 mg, 5.6 mmol), Xantphos (129 mg, 0.22 mmol) and palladium(0)bis(dibenzylideneacetone) (65 mg, 0.11 mmol) were added sequentially. The mixture was heated at 100° C. with stirring under argon for 16 h. Additional palladium(0)bis(dibenzylideneacetone) (65 mg, 0.11 mmol) and N-ethylurea (560 mg, 6.4 mmol) were added and the mixture heated at reflux for 5 h. The mixture was cooled to RT, diluted with acetonitrile (100 mL) and then adsorbed on to silica by concentration in vacuo. The crude product was purified by flash chromatography (40 g GraceResolv silica cartridge, 0-10% MeOH in EtOAc) to afford iii as a light brown solid (244 mg, 20%). [M+H]+ m/z=320.05.

Provenance & Evidence