Acetic Acid → HCID 178458305, compound

Participants

Reaction Steps

A stirred solution of 6-hydroxy-2-(2-propoxyphenyl)-pyrimidine-4-carboxamide (0.50 g) in phosphoryl chloride (16 ml) was heated under reflux for 4 hours and then the reaction mixture was evaporated under reduced pressure to remove excess phosphoryl chloride. Water was added to the residue, which was extracted with chloroform (3×20 ml). The combined extracts were washed with water, dried (magnesium sulphate) and evaporated under reduced pressure to yield an oil which was heated on a steam bath with glacial acetic acid (15 ml) for 4 hours. The cooled reaction mixture was evaporated under reduced pressure to yield a crude product which was combined with further product similarly prepared from 6-hydroxy-2-(2-propoxyphenyl)pyrimidine-4-carboxamide (0.82 g) and phosphoryl chloride (25 ml). The combined products were eluted from silica with ether:chloroform (9:1) and fractions containing product were combined and evaporated under reduced pressure to yield the title compound, 0.31 g, m.p. 135°-6° C., (from isopropanol/ether).

Provenance & Evidence