反应详情

10.7 g of 2-chloro-3-morpholinyl-5-methyl-pyrazine and 16.6 g of 2-phenyl-3-isopropyl-5-hydroxymethyloxazolidine are dissolved in 130 ml of hexamethylphosphoric acid triamide. 3.6 g of a 50% strength suspension of sodium hydride in paraffin oil are introduced into this solution over the course of 30 minutes at 0°-5° C., whilst stirring. The mixture is then stirred for 1 hour at 0°-5° C. and 24 hours at room temperature. The reaction mixture is then poured onto 500 ml of ice water and extracted by shaking with ether. The ether extracts are washed with water and evaporated in a waterpump vacuum. The residue is taken up in 200 ml of 1 N sulphuric acid and the reaction mixture is stirred for 15 hours at room temperature and then extracted by shaking with ether. The acid aqueous phase is rendered alkaline with concentrated sodium hydroxide solution and is then extracted by shaking with ether. The ether extracts are washed with water, dried over sodium sulphate and evaporated in a waterpump vacuum. The residue crystallises from ether-pentane. 2-(3'-Isopropylamino-2'-hydroxy-propoxy)-3-morpholinyl-5-methyl-pyrazine, melting point 77°-78° C., is thus obtained.

1. additionare introduced into this solution over the course of 30 minutes at 0°-5° C.
2. stirringThe mixture is then stirred for 1 hour at 0°-5° C. and 24 hours at room temperature
3. extractionextracted
4. stirringby shaking with ether
5. washThe ether extracts are washed with water
6. customevaporated in a waterpump vacuum
7. stirringthe reaction mixture is stirred for 15 hours at room temperature
8. extractionextracted
9. stirringby shaking with ether
10. extractionis then extracted
11. stirringby shaking with ether
12. washThe ether extracts are washed with water
13. dry with materialdried over sodium sulphate
14. customevaporated in a waterpump vacuum
15. customThe residue crystallises from ether-pentane