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

Beteiligte Stoffe

Reaktionsschritte

To a suspension of 2.5 g (8.2 mmoles) of the 6-(1,2,4-triazol-1-ylmethyl)-4,9-dihydro-3H-pyrano[3,4-b]indol-1-on a hydrochloride in 50 ml of methanol were added 0.66 ml (10.2 mmoles) of methanesulphonic acid. The mixture was left under stirring at the reflux temperature for 4 hours. The solvent was evaporated to dryness under reduced pressure, the residue dissolved with 10 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 2.3 g (94%) of the title ester as a yellow crystalline solid.

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