4-Cyclohexylphenol → (2S,6R)-2-(4-cyclohexyl-phenoxymethyl)-6-ethyl-2,3,5,6-tetrahydro-oxazolo[3,2-a]pyrimidin-7-one

関与物質

反応条件

反応手順

A solution of (S)-5-(4-cyclohexyl-phenoxymethyl)-4,5-dihydro-oxazol-2-ylamine (0.85 g, 3.09 mmol), prepared in accordance with the procedures in Steps 1 and 2 of Example 1 and starting from R-epichlorohydrin and 4-cyclohexylphenol, and ethyl ethylacrylate (1.0 g, 7.57 mmol) in n-butanol (2 ml) was heated at 90° C. for 18 hrs. The reaction mixture was concentrated and loaded onto a silica gel column, and eluted with 2-6% isopropanol/methylene chloride to afford (2S,6R)-2-(4-cyclohexyl-phenoxymethyl)-6-ethyl-2,3,5,6-tetrahydro-oxazolo[3,2-a]pyrimidin-7-one (0.24 g) and (2S,6S)-2-(4-cyclohexyl-phenoxymethyl)-6-ethyl-2,3,5,6-tetrahydro-oxazolo[3,2-a]pyrimidin-7-one (0.34 g).

情報源と証拠