反应详情

556 mg (2.25 mmol) of the compound from Example 41A and 14.7 ml of dioxane are added to a suspension of 802 mg (4.72 mmol) of silver(I) nitrate in 2 ml of water. A solution of 193 mg (4.84 mmol) of sodium hydroxide in 7.8 ml of water is then added slowly. The mixture is stirred at RT for 3 h. The mixture is then filtered through Celite, which is washed with warm water. The filtrate obtained is acidified by addition of 1 N hydrochloric acid and extracted three times with in each case 20 ml of diethyl ether. The combined organic phases are dried over magnesium sulfate and the solvent is removed on a rotary evaporator. The residue is purified by preparative HPLC (column: YMC GEL ODS-AQ S-5/15 μm; mobile phase gradient: acetonitrile/water 10:90→95:5).

1. filtrationThe mixture is then filtered through Celite, which
2. washis washed with warm water
3. customThe filtrate obtained
4. extractionextracted three times with in each case 20 ml of diethyl ether
5. dry with materialThe combined organic phases are dried over magnesium sulfate
6. customthe solvent is removed on a rotary evaporator
7. customThe residue is purified by preparative HPLC (column: YMC GEL ODS-AQ S-5/15 μm; mobile phase gradient: acetonitrile/water 10:90→95:5)