反应详情

A suspension of methyl triphenylphosphonium bromide (2.293 g, 6.42 mmole) in 40 mL of THF at 0° C., was treated dropwise with 2.6 mL of 2.5M butyllithium. The mixture was stirred at room temperature for 30 minutes and then cooled to 0° C. A solution of 1-(4,4-dimethyl-thiochroman-7-yl)-hexan-1-one (1.183 g, 4.28 mmole) in 10 mL of THF was added to the ylide solution. The reaction mixture was stirred at room temperature for one hour, quenched by the addition of 50 mL water and was extracted with three 50 mL portions of ether. The combined organic extracts were dried over MgSO4, filtered and concentrated in vacuo to give a yellow solid. The product was purified by flash chromatography (SiO2, 1% ethyl acetate in hexanes) to yield 0.939 g of 4,4-dimethyl-7-(1-methylene-hexyl)-thiochroman as a colorless oil.

1. temperaturecooled to 0° C
2. stirringThe reaction mixture was stirred at room temperature for one hour
3. customquenched by the addition of 50 mL water
4. extractionwas extracted with three 50 mL portions of ether
5. dry with materialThe combined organic extracts were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customto give a yellow solid
9. customThe product was purified by flash chromatography (SiO2, 1% ethyl acetate in hexanes)