反应详情

362 mL of thionyl chloride was added at −78° C. and under a nitrogen gas flow to a 14 mL chloroform solution of 700 mg of the compound obtained in step 9-1 and 240 mg of pyridine, and the reaction mixture was stirred for 30 minutes at the same temperature. After this, a 5 mL chloroform solution of 485 mg of the compound obtained in step 9-2 and 2.05 g of triethylamine was added over a period of 2 minutes, after which the temperature was raised to room temperature and the reaction mixture was stirred for 15 hours at that temperature. 50 mL of ethyl acetate and 30 mL of a 5% potassium carbonate aqueous solution were added to the reaction solution, and the reaction mixture was stirred for 5 minutes. After liquid separation, the aqueous layer was extracted with ethyl acetate (30 mL×2), the combined organic layer was washed with saturated brine and dried with magnesium sulfate, the drying agent was filtered off, and the reaction mixture was concentrated under reduced pressure. The residue thus obtained was purified by column chromatography (silica gel 60N, mobile phase: ethyl acetate/acetone=1/1; v/v) to obtain 697 mg of mixture of diastereoisomers of the titled compound (reddish-brown, amorphous).

1. stirringthe reaction mixture was stirred for 15 hours at that temperature
2. stirringthe reaction mixture was stirred for 5 minutes
3. customAfter liquid separation
4. extractionthe aqueous layer was extracted with ethyl acetate (30 mL×2)
5. washthe combined organic layer was washed with saturated brine
6. dry with materialdried with magnesium sulfate
7. filtrationthe drying agent was filtered off
8. concentrationthe reaction mixture was concentrated under reduced pressure
9. customThe residue thus obtained
10. customwas purified by column chromatography (silica gel 60N, mobile phase: ethyl acetate/acetone=1/1; v/v)