1,2-Dimethoxyethane → HCID 86757823, compound

Participants

Reaction Steps

To a solution of 1-methyl-3,5-diphenyl-6-chloro-1H-pyrazin-2-one (0.5 g) in 3:1 ethylene glycol dimethylether : water (30 cm3), under nitrogen, was added sequentially 4-pyridyl boronic acid lithium salt (0.42 g), sodium carbonate (0.72 g) and tetrakis-triphenylphosphine palladium (0.07 g). The reaction was heated at reflux, under nitrogen, overnight. The solvents were evaporated and the residue partitioned between water and 5% methanol/dichloromethane. The organic phase was separated, dried over magnesium sulphate and evaporated in vacuo. The residue was subjected to silica gel chromatography using 2% methanol/dichloromethane as eluant. The product was treated with hydrogen chloride in methanol and recrystallised from ethyl acetate/diethyl ether to afford 1-methyl-3,5-diphenyl-6-(4-pyridyl)-1H-pyrazin-2-one hydrochloride(0.2 g ; 32%) as yellow crystals. Found C, 70.50; H, 4.90; N, 11.20% C22H17N3O.HCl requires C, 70.30; H, 4.83; N, 11.18%.m/e (ES+) 340 (M+H)+.

Provenance & Evidence