反应详情

250 mg (1.19 mmol) of the compound from Example 3A, 108 mg (0.99 mmol) 2-hydrazinopyridine and 23 mg (99 μmol) camphor-10-sulfonic acid are dissolved in 5 ml anhydrous ethanol and the mixture is heated under reflux overnight. In each case 108 mg (0.99 mmol) 2-hydrazinopyridine are added again a total of four times and the mixture is heated further under reflux until the conversion of the compound from Example 3A is complete. After cooling, the reaction mixture is purified by preparative HPLC several times (RP18 column; mobile phase: acetonitrile/water gradient with addition of 0.1% conc. hydrochloric acid) and 6 mg (2% of th.) of the title compound are obtained.

1. temperaturethe mixture is heated
2. temperatureunder reflux overnight
3. temperaturethe mixture is heated further
4. temperatureAfter cooling
5. customthe reaction mixture is purified by preparative HPLC several times (RP18 column; mobile phase: acetonitrile/water gradient with addition of 0.1% conc. hydrochloric acid) and 6 mg (2% of th.) of the title compound
6. customare obtained