反应详情

1.69 ml (20.9 mmol) of pyridine and 1.5 ml (20.9 mmol) of thionyl chloride are added successively at -5° C. to 5 g (13.9 mmol) of the compound from Example 4 dissolved in 100 m of dry tetrahydrofuran and the mixture is stirred for 15 minutes at the same temperature. The mixture is diluted using ethyl acetate and extracted several times using saturated sodium hydrogen carbonate solution, and the organic phases are dried over magnesium sulphate and concentrated in vacuo. The residue is chromatographed on a column (silica gel 70-230 mesh, in petroleum ether/ethyl acetate 95:5).

1. additionThe mixture is diluted
2. extractionextracted several times
3. dry with materialthe organic phases are dried over magnesium sulphate
4. concentrationconcentrated in vacuo
5. customThe residue is chromatographed on a column (silica gel 70-230 mesh, in petroleum ether/ethyl acetate 95:5)