反应详情

To a solution of 7.57 g of product from Example 82 in 180 ml of anhydrous tetrahydrofuran, under argon, is added 1.3 g of 50% sodium hydride in oil. The mixture is stirred at room temperature for 1 hour; followed by the addition of 10.6 ml of 1,5-dibromopentane and the stirring is continued for 4 hours at room temperature. The reaction mixture is poured into 450 ml of water and extracted with diethyl ether. The organic layer is washed with saturated sodium chloride, dried, filtered and concentrated in vacuo to give 23 g of a crude oil. The oil is purified by chromatography (silica gel: hexane to 10% ethyl acetate/hexane) to give 8.9 g of the desired product.

1. waitthe stirring is continued for 4 hours at room temperature
2. extractionextracted with diethyl ether
3. washThe organic layer is washed with saturated sodium chloride
4. customdried
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto give 23 g of a crude oil
8. customThe oil is purified by chromatography (silica gel: hexane to 10% ethyl acetate/hexane)