Guaifenesin → HCID 19762939, Verbindung

Beteiligte Stoffe

Reaktionsschritte

A solution of 3-(2-methoxy-phenoxy)-propane-1,2-diol (4.7 g) in pyridine, cooled at 5°-10° C., is treated under stirring with a solution of p-toluensulphonylchloride (4.5 g) in benzene (70 ml). The reaction mixture is stirred overnight at room temperature, then it is washed with 2N HCl (3×100 ml) and with water, dried on Na2SO4 and evaporated to dryness in vacuum. The oily residue is purified by column chromatography (silica gel 230-400 mesh hexane/AcOEt=3/1) to yield 5 g of 3-(2-methoxy-phenoxy)-2-hydroxy-1-propyl p-toluensulphonate (oil, NMR (--CDCl3):δ=2,4 3H (s) CH3SO2 ; δ=3,75-4,4 5H (m) OCH3 +OCH2.

Herkunft & Nachweise