Hydrochloric Acid → HCID 67533535, compound

Participants

Reaction Steps

4.5 g (13 mmol) of ethyl 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-2-oxo-1,2-dihydroquinoxaline-3-carboxylate was dissolved in ethanol (100 ml), and 4.1 g (26 mmol) of a 25% aqueous solution of sodium hydroxide was added thereto. The solution was stirred for 2 hours at room temperature. The reaction mixture was concentrated under reduced pressure and water was added to the residue thus obtained. The mixture was acidified using 10% hydrochloric acid. A solid precipitated therefrom was separated by filtration, washed with water, and then dried to obtain 3.9 g (yield: 94%) of 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-2-oxo-1,2-dihydroquinoxaline-3-carboxylic acid as a pale yellow powder.

Provenance & Evidence