Sodium Hydroxide → 3-Amino-7-vinylquinoline-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Ethyl 3-{[(benzyloxy)carbonyl]amino}-7-bromoquinoline-2-carboxylate (1.50 g, 3.49 mmol), K3PO4 (1.48 g, 6.97 mmol), 1,4-dioxane (45 mL), water (7.5 mL) and 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (0.80 g, 5.2 mmol) were added to a flask. The reaction mixture was purged with nitrogen for 10 min., then dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine-(2′-aminobiphenyl-2-yl)(chloro)palladium (1:1) (0.18 g, 0.23 mmol) was added. The flask was then sealed and the reaction mixture was heated at 80° C. for 1 h, then allowed to cool to room temperature. After the reaction mixture was allowed to cool, aq. NaOH (2.5 M; 45 mL) was added, the resulting cloudy mixture was then heated at 95° C. for 3 h, and then allowed to cool. The crude product formed as a precipitate, which was collected by vacuum filtration and used in the next step without further purification. LCMS calc. for C12H11N2O2 (M+H)+: m/z=215.2. Found: 215.0.

Provenance & Evidence