Dimethyl Sulfate → HCID 44550983, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 158 (6.36 g, 22-mmol) in a mixture of aqueous KOH (5N, 340 mL, 1.7 mol) and MeOH (205 mL) was stirred at reflux for 3 h, then cooled to 5° C. and treated dropwise with Me2SO4 (26 mL. 275 mmol). After stirring at room temperature for a further 4 h the mixture was concentrated to half volume, acidified with dilute aqueous HCl, and the precipitated product was crystallised from EtOAc/hexane to give 6-(methylsulfanyl)-2-naphthoic acid (159) (4.39 g, 91%) as a white solid: mp (MeOH) 231-233° C.; 1H NMR [(CD3)2SO] δ (CO2H not observed) 8.53 (s, 1H), 8.01 (d, J=8.9 Hz, 1H), 7.96 (dd, J=8.6, 1.7 Hz, 1H), 7.90 (d, J=8.7 Hz, 1H), 7.77 (d, J=1.7 Hz, 1H), 7.47 (dd, J=+8.7, 1.9 Hz, 1H), 2.61 (s, 3H). Anal. (C12H10O2S) C, H.

Provenance & Evidence