Diethyl Oxalate → HCID 21544774, compound

Participants

Reaction Steps

A mixture of 1-(2-acetyl-3-hydroxyphenoxy)-2-hydroxy-3-p-methoxyphenoxypropane (13.3 g) and diethyl oxalate (15 ml) was added to alcohol-free sodium ethoxide (prepared from sodium 3.0 g) in absolute ether (100 ml). The mixture was heated under reflux for 1.5 hours during which time a yellow solid separated. The residue was poured onto ice (100 g) and acidified with a solution of acetic acid (12 ml) in water (80 ml). The ether layer was separated and the aqueous solution was extracted with ether (3 × 25 ml). The combined ethereal layers were evaporated and the residue was dissolved in a mixture of acetic acid (80 ml) and hydrochloric acid (30 ml) and heated under reflux for 1 hour. On pouring into water (1 L) an off white solid was precipitated which was collected and recrystallized from acetic acid to give 1-(2-carboxychromon-5-yloxy)-2-hydroxy-3-p-methoxyphenoxypropane (12.0 g) as a white solid, m.p. 125°-126° C.

Provenance & Evidence