反应详情

A 100 mL round bottom flask was charged with magnesium turnings (360 mg, 14.6 mmol) and a stir bar. The flask was dried with a heat gun for 5 minutes then cooled under nitrogen. The flask was charged with THF (5 mL) and a small grain of iodine. A solution of linoleyl bromide (4 g, 12.1 mmol) in THF (5 mL) was added slowly and after 5 minutes the reaction initiated vigorously. The solution was stirred at room temperature for 2 hours, and then ethyl glyoxalate (0.5 mL, 2.42 mmol, 50% solution in toluene) was added. The exothermic reaction was finished immediately and quenched with saturated ammonium chloride solution (5 mL). The solution diluted with water and extracted with diethyl ether (3×50 mL). The combined diethyl ether extracts were dried on magnesium sulfate, filtered and concentrated in vacuo to dryness. The oil was purified by column chromatography on silica gel 60 (eluted with 100% Hexanes to 15% Et2O in hexanes) to afford (6Z,9Z,29Z,32Z)-19-((9Z,12Z)-octadeca-9,12-dienyl)octatriaconta-6,9,29,32-tetraene-19,20-diol as a colorless oil (945 mg, 48%).

1. customThe flask was dried with a heat gun for 5 minutes
2. temperaturethen cooled under nitrogen
3. additionThe flask was charged with THF (5 mL)
4. customThe exothermic reaction
5. customquenched with saturated ammonium chloride solution (5 mL)
6. additionThe solution diluted with water
7. extractionextracted with diethyl ether (3×50 mL)
8. dry with materialThe combined diethyl ether extracts were dried on magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo to dryness
11. customThe oil was purified by column chromatography on silica gel 60 (eluted with 100% Hexanes to 15% Et2O in hexanes)