Sodium Carbonate → Methyl 4-pyridin-3-ylbenzoate

Participants

Reaction Conditions

Reaction Steps

Procedure H′: 750 mg of pyridine-3-boronic acid (6.14 mmol), 1.34 g of methyl 4-bromobenzoate (6.22 mmol) are put in the reaction vessel with 25 ml of DME: water: EtOH=7:3:2.). 6.25 ml of aqueous 2M Na2CO3 is added to the mixture and 250 mg of tetrakis(triphenylphosphine is added. The vessel is sealed and heated at 110° C. for 40 min in Microwave machine (MARS). After cooling, water and CH2Cl2 are added. The CH2Cl2 layer is separated, washed by brine, dried over Na2SO4 and evaporated. The crude product is applied to silica-gel column chromatography (Hexane:AcOEt=3:1) to give 4-pyridin-3-yl-benzoic methyl ester. Yield 50%: mass spectrum (m/e): 214(M+1); 1H-NMR(CDCl3): 8.92(m, 1H), 8.68(m, 1H), 8.18(d, 2H, J=7.6 Hz), 7.95(m, 1H), 7.69(d, 2H, J=7.6 Hz), 7.43(m, 1H), 3.99(s, 3H).

Provenance & Evidence