Hydrochloric Acid → HCID 50923238, compound

Participants

Reaction Steps

To a solution of (1,6-dihydroxy-4-methyl-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester (0.5 g, 2.0 mmol) in anhydrous DMF (10 mL) were added NaH (0.240 g, 6.0 mmol, 60% in mineral oil) and 2-chloro-pyrimidine (0.275 g, 2.4 mmol) at 0° C. After stirring at room temperature for 16 hours, the reaction mixture was cooled to 0° C., diluted with water (20 mL) and acidified to pH 2 with dilute hydrochloric acid. The mixture was extracted with ethyl acetate and the organic extract washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was dissolved in MeOH (10 mL) and aqueous LiOH (1N, 5 mL) was added at 0° C. After stirring at room temperature for 1 hour, the mixture was acidified to pH 3 using dilute hydrochloric acid and concentrated. The residue was purified by silica gel flash column chromatography (DCM/MeOH/AcOH=10:1:trace) to give the product (0.132 g, 22.0%). mp 118-120° C. 1HNMR (400 MHz, DMSO-d6) δ 9.22 (s, 1H), 8.65 (d, J=4.68 Hz, 2H), 7.22-7.45 (m, 2H), 7.11 (s, 1H), 5.53 (dd, J=9.51, 1.90 Hz, 1H), 3.10 (dd, J=15.66, 2.49 Hz, 1H), 2.31 (s, 3H), 2.15 (dd, J=15.52, 9.66 Hz, 1H). MS (ESI) m/z=301 [M+H]+.

Provenance & Evidence