Methanesulfonic Acid → 3-(2-Hydroxyethyl)-5-(1,2,4-triazol-1-ylmethyl)-1h-indol-2-carboxylic acid methyl ester

Beteiligte Stoffe

Reaktionsschritte

2.7 ml (42 mmoles) of methanesulphonic acid were added to a suspension de 6 g (21 mmoles) of the 3-(2-hydroxyethyl)-5-[1,2,4]triazol-1-ylmethyl-1H-indol-2-carboxylic acid in 120 ml of methanol. The mixture was left under stirring at reflux temperature for 3 hours. The solvent was evaporated to dryness under reduced pressure, the residue dissolved with 20 ml of a saturated bicarbonate solution and extracted 3 times with ethyl acetate. The combined organic phases were dried and evaporated to dryness, and the evaporated solid recrystallised from isopropyl alcohol/heptane to give 5.9 g (93%) of the title ester as a yellow crystalline solid.

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