Methyl iodide → 2-(2,3-dihydro-6-ethyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methyl-1-(2-methylenecyclopentyl)propan-1-one

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Reaction Steps

Sodium hydride (60%, 0.06 g) was added to a stirred solution of 2-(2,3-dihydro-4-oxo-6-methyl-5-phenyl-4H-1,3-oxazin-3-yl)-2-methyl-1-(2-methylenecyclopentyl)propan-1-one (0.45 g) at 20° C. After 10 minutes, iodomethane (0.1 ml) was added and stirring continued for 3 hours. Ethyl acetate and water were added and the organic phase dried (magnesium sulphate), evaporated and purified by silica gel column chromatography eluting with n-hexane/ethyl acetate (3:1) to give 2-(2,3-dihydro-6-ethyl-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methyl-1-(2-methylenecyclopentyl)propan-1-one (Compound 1075, 0.15 g), NMR: 1.09(t,3H), 1.49(s,3H), 1.55(s,3H), 1.80-2.00(3H), 2.21(q,2H), 2.25-2.50(3H), 3.89(1H), 4.86(s,1H), 4.98(s,1H), 5.26(d,1H), 5.32(d,1H), 7.20-7.38(5H).

Provenance & Evidence