(-)-Epichlorohydrin → 2-[3-((s)-3-Ethyl-5-methyl-4-oxiranylmethoxy-phenyl)-[1,2,4]oxadiazol-5-yl]-5-isobutyl-4-methyl-pyridine

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Reaction Steps

To a solution of the compound of Example 32 (315 mg, 896 μmol) in isopropanol (10 mL) and 3 N aq. NaOH (2 mL), (R)-epichlorohydrine (249 mg, 2.69 mmol) is added. The mixture is stirred at rt for 18 h before another portion of (R)-epichlorohydrine (249 mg, 2.69 mmol) is added. Stirring is continued at rt for 24 h. The mixture is diluted with EA and washed with water. The org. extract is concentrated and the crude product is purified on prep. TLC plates using heptane:EA 7:3 to give 2-[3-((S)-3-ethyl-5-methyl-4-oxiranylmethoxy-phenyl)-[1,2,4]oxadiazol-5-yl]-5-isobutyl-4-methyl-pyridine (233 mg) as a colourless oil; LC-MS: tR=1.18 min, [M+H]+=408.09.

Provenance & Evidence