反应详情

This reaction was performed with reference to the literature (Mitsunobu, O., Synthesis, 1981, 1-28.). 5-Mercapto-1-phenyltetrazole (16.30 g, 91.20 mmol), triphenylphosphine (27.30 g, 104 mmol) and diisopropyl azodicarboxylate (95%, 21.10 g, 104 mmol) were added to a THF (410 ml) solution of ethyl-(2E)-5-hydroxy-3-methylpent-2-enoate (13.80 g, 86.90 mmol) while ice cooling. The reaction solution was warmed to room temperature and stirred for four hours. After the reaction solution was diluted with ethyl acetate, it was washed with distilled water and brine. After the organic layer was dried over anhydrous sodium sulfate and the drying agent was filtered off, the organic layer was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (Merck, commercial name Silica Gel 60, 230-400 mesh; hexane:ethyl acetate=5:1) to obtain the title compound (27.16 g) as a white solid.

1. custom, Synthesis, 1981, 1-28
2. washwas washed with distilled water and brine
3. dry with materialAfter the organic layer was dried over anhydrous sodium sulfate
4. filtrationthe drying agent was filtered off
5. concentrationthe organic layer was concentrated under reduced pressure
6. customThe obtained residue was purified by silica gel column chromatography (Merck, commercial name Silica Gel 60, 230-400 mesh; hexane:ethyl acetate=5:1)