Hydrochloric Acid → 3-(Benzo[d][1,3]dioxol-5-yl)-2-phenylquinoxaline-6-carboxylic acid

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Reaktionsschritte

A suspension of methyl 3-bromo-2-phenylquinoxaline-6-carboxylate (80 mg, 0.23 mmol, 1.00 equiv), benzo[d][1,3]dioxol-4-ylboronic acid (59 mg, 0.36 mmol, 1.50 equiv), tricyclohexylphosphine (9 mg, 0.03 mmol, 0.14 equiv), Pd2(dba)3 (13 mg, 0.01 mmol, 0.06 equiv), and K3PO4 (149 mg, 0.80 mmol, 3.00 equiv). in dioxane/H2O (1/0.5 mL) in a 10-mL sealed tube was allowed to react, with stifling, overnight at 95° C. The pH value of the solution was adjusted to 7 with HCl (1N). Purification via silica gel column (dichloromethane:methanol (1:10)) afforded 35 mg (40%) of 3-(benzo[d][1,3]dioxol-5-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid.

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