Trifluoroacetic acid → HCID 19354624, compound

Participants

Reaction Steps

A mixture of tert butyl 2-(2,3-dihydro-6-methoxymethyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methylpropanoate (2.6 g) and trifluoroacetic acid (2.05 g) was stirred in dichloromethane for 20 hours at 35° C. A further addition of trifluoroacetic acid (0.82 g) was made and the solution heated under reflux for 24 hours. The cooled mixture was diluted (dichloromethane) and extracted (sodium carbonate solution). The aqueous extract was acidified (2 M hydrochloric acid solution), extracted (ethyl acetate), dried (magnesium sulphate) and evaporated. The residue was dissolved in ethyl acetate and evaporated (three times) redissolved in hexane and evaporated to give 2-(2,3-dihydro-6-methoxymethyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methylpropanoic acid (1.74 g) as a white solid, m.p. 135-138° C.

Provenance & Evidence