反应详情

Dissolve 0.5 g (1.07 mmol) of the compound obtained in Example 1 at 0° C. in 0.255 ml (2.7 mmol) of acetic anhydride under an inert atmosphere. Add 2 volumes of pyridine (0.5 10 ml) and continue stirring while returning to room temperature for a period of 1 h 30. Neutralise with a saturated sodium hydrogen carbonate solution. After extraction with ether (2×25 ml), the product is purified by chromatography on a silica column (eluant:ethyl acetate/petroleum ether, 20:80) and obtained in pure form as a solid in a yield of 92%.

1. extractionAfter extraction with ether (2×25 ml)
2. customthe product is purified by chromatography on a silica column (eluant:ethyl acetate/petroleum ether, 20:80)
3. customobtained in pure form as a solid in a yield of 92%