4,6-Dichloropyrimidine → 6-(6-Chloropyrimidin-4-yloxy)isoquinoline-1-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

40 ml (20 mMol) of a 0.5 M solution of sodium methylate in MeOH are added to a suspension of 1.9 g (10 mMol) 6-hydroxy-isoquinoline-1-carboxylic acid (CAS 174299-07-1) in 50 ml MeOH and sonicated until a solution is obtained. The solvent is then evaporated off. The residue is dried in high vacuum for 4 h and 100 ml DMF are added. The suspension is cooled to 10° C. and a solution of 1.55 g (10 mMol) 4,6-dichloropyrimidine in 25 ml DMF is added. The reaction mixture is stirred at room temperature for 14 h. The solvent is evaporated off and the mixture is partitioned between H2O/EtOAc. After extraction, the aqueous phase is neutralized with a 1 N solution of HCl. The suspension is extracted with EtOAc, washed with H20 and brine, dried (MgSO4) and concentrated to give a beige powder: 1H-NMR (DMSO-d6): δ ppm 7.60 (s, 1H), 7.68 (dd, J=9.4, 2.3 Hz, 1H), 7.98 (d, J=2.3 Hz, 1H), 8.04 (d, J=5.5 Hz, 1H), 8.59 (d, J=5.9 Hz, 1H), 8.66 (s, 1H), 8.68 (s, 1H).

Provenance & Evidence