Reaktion #461

Reaktionsgleichung

Clc1ccnc(Cl)c1

Nc1ncco1

→

Clc1ccnc(Nc2ncco2)c1

Ausbeute 2.0%

Lösungsmittel

CC(=O)N(C)C

Reaktionsbedingungen

Vorschrift

oxazol-2-amine (85 mg, 1.01 mmol), 2,4-dichloropyridine (0.151 mL, 1.01 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (70.4 mg, 0.12 mmol) and cesium carbonate (660 mg, 2.03 mmol) were stirred in DMA (5 mL). The mixture was purged with nitrogen for 10 minutes. Palladium(II) acetate (22.76 mg, 0.10 mmol) was added and the mixture heated at 100 °C for 70h. The mixture was cooled, filtered and concentrated. The crude product was purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5µ silica, 19 mm diameter, 100 mm length), using decreasingly polar mixtures of water (containing 1% NH3) and MeCN as eluents. Fractions containing the desired compound were evaporated to dryness to afford N-(4-chloropyridin-2-yl)oxazol-2-amine (3.90 mg, 1.967 %).

Quelle