Ethanol → 6-(5-Carboxy-naphthalen-2-yloxy)-pyrimidine-4-carboxylic acid ethyl ester

Participants

Reaction Steps

A mixture of 10 g (33.3 mMol) 6-(6-chloro-pyrimidin-4-yloxy)-naphthalene-1-carboxylic acid (preparation see WO 2006/59234; Step 25.1), 150 ml EtOH, 9.03 ml (64:9 mMol) Et3N and 2.35 g (3.32 mMol) PdCl2(PPh3)2 is stirred under a atmosphere of 120 bar carbonmonoxide in an autoclave for 12 h at 115° C. The reaction mixture is diluted with 400 ml EtOAc, filtered through Hyflo and the residue washed with MeOH. The filtrate is concentrated and the residue suspended in 400 ml EtOAc and 200 ml water. Acidification to pH 4 with 4 N HCl and addition of MeOH produces a solution. The aq. layer is separated off and extracted with 3 portions of EtOAc. The organic phases are washed with water and brine, dried (Na2SO4), treated with char coal and concentrated. Trituration of the residue in EtOAc/ether and filtration gives the title compound: m.p.: 211-212° C.; MS: [M+1]+=339.

Provenance & Evidence