Acetic Acid → 3-{[(Benzyloxy)carbonyl]amino}-7-vinylquinoline-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a screw-cap vial equipped with a magnetic stir bar, ethyl 3-{[(benzyloxy)carbonyl]amino}-7-bromoquinoline-2-carboxylate (Example 1, step 3, 971.6 mg, 2.263 mmol), chloro(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl) [2-(2′-amino-1,1′-biphenyl)]palladium(II) (Aldrich, 163.8 mg, 0.2082 mmol) and K3PO4 (1017.1 mg, 4.7916 mmol) were added. The vial was sealed with a Teflon-lined septum, evacuated and backfilled with nitrogen (this process was repeated a total of three times). A solution of vinylboronic acid pinacol ester (561.6 mg, 3.646 mmol) in 1,4-dioxane (10.0 mL) was added via a syringe, followed by deoxygenated water (8.0 mL). The mixture was then heated at 90° C. for 6 h. After the reaction was cooled to room temperature, water (50 mL) was added. AcOH (1.50 mL, 26.4 mmol) was added to adjust the pH to 5. The mixture was extracted with EtOAc (3×50 mL). The combined organic layer was washed with brine (100 mL), dried over Na2SO4 and concentrated under reduced pressure. The resulting residue was purified by flash chromatography on silica gel (0-10% MeOH in DCM) to give the title compound as a yellow solid (673.9 mg, 85%). LCMS calc. for C20H17N2O4 (M+H)+: m/z=349.1. found 349.1.

Provenance & Evidence