4-Benzyloxy-phenylboronic acid → HCID 178493142, compound

Participants

Reaction Steps

0.38 g of 2-[2-(4-methoxypyridin-2-yl)ethyl]-6-iodo-3H-imidazo[4,5-b]pyridine (example 7) and 0.342 g of 4-benzyloxyphenylboronic acid are dissolved in 16 ml degassed dioxane. Then a solution of 0.276 g of potassium carbonate and 0.85 g of lithium chloride in 13 ml of degassed water and 0.115 g of tetrakis(triphenylphosphine)palladium(0) are added. The mixture is heated to reflux under N2 for 20 hours and, after cooling, addition of water and adjusting the pH to 7, it is extracted three times with dichloromethane. The combined organic phases are dried over sodium sulfate, concentrated and the residue is chromatographed on a silica gel column (dichloromethane/methanol 30–26:1). Concentration of the chromatographically pure fractions and crystallisation from ethyl acetate gives 0.28 g of the title compound as a colourless solid of m.p. 161–162° C. The mass spectrum shows the molecular peaks MH+ and 2MNa+ at 437.3 and 894.2 Da.

Provenance & Evidence