Chloroform → 3-Thiopheneethanol methanesulfonate

Participants

Reaction Steps

To a solution of 5.0 g (7.8×10-3 mol) of 2-(3-thienyl)-ethanol (Aldrich Chemical) in 10 ml of dry, freshly distilled pyridine was added 3.62 ml (1.2 equiv.) of methanesulfonyl chloride in 20 ml of pyridine at 5°-10° C. The addition was carried out gradually, over a period of about 15-20 min. The reaction mixture was stirred overnight at room temperature and was quenched by pouring into a separatory funnel containing water and ether. The layers were separated and the aqueous layer was extracted three times with ether. The combined organic extracts were extracted once with 10% hydrochloric acid, followed by water and drying over Na2SO4. Evaporation of the solvent afforded 5.3 g of a light brown oil (65% yield), and tlc (CHCl3) showed a single spot. Chromatographic purification on silica gel afforded a light yellow oil. Nmr (CDCl3, δ rel TMS) 2.9s, 3H; 3.1t, 2H; 4.4t, 2H; 7.0-7.4m, 3H. Ir (neat, ν cm-1) 3100w, 2930w, 2920w 1415w, 1355s, 1335s, 1245w, 1173s, 1080w, 1055w, 970s, 955s, 903m, 850m, 825w, 795s, 775s, 740w. MS, 206.0.

Provenance & Evidence