反应详情

A solution of isopropylmagnesium chloride (2M in THF, 10 ml, 20.04 mmol) was added drop wise to a solution of the product obtained in step 1 (5.00 g, 13.36 mmol) in THF (30 ml) at −10° C. The mixture was stirred at this temperature for 1 h and then added drop wise to acetic acid anhydride (12.6 ml, 133.60 mmol) at −15° C. The reaction mixture was stirred at 0° C. for 2 h and allowed to warm up slowly to RT. Water (100 ml) was added and the reaction mixture was stirred at 60° C. for 15 min. The mixture was diluted with ethyl acetate at RT, neutralized with aqueous NaHCO3, washed with brine, dried over sodium sulphate and evaporated. Purification of the crude product by silica gel chromatography using ethyl acetate/n-heptane gave the desired product (2.00 g, 44%).

1. stirringThe reaction mixture was stirred at 0° C. for 2 h
2. stirringthe reaction mixture was stirred at 60° C. for 15 min
3. washwashed with brine
4. dry with materialdried over sodium sulphate
5. customevaporated
6. customPurification of the crude product by silica gel chromatography