Diethyl Ether → 2-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2,4-dimethylpentan-3-one

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Reaction Steps

A solution of 2-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2,4-dimethylpentan-3-ol (1.7 g) in dichloromethane was added to a stirred mixture of pyridinium chlorochromate (1.81 g) and powdered molecular sieve (4A) in dichloromethane at 20° C. After 5 hours, ether was added, the mixture filtered through hyflo and evaporated. The residue was purified by dry column chromatography on silica gel, eluting with dichloromethane/ethyl acetate to give 2-(2,3-dihydro-6-methyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2,4-dimethylpentan-3-one (Compound 1, 0.84 g) as a white solid, m-p. 98.6-101.6° C.

Provenance & Evidence