Reaktion #319988

Reaktionsgleichung

3α-N-methyl-nicotinoyloxy-5α-pregnan-20-one iodide salt

sodium bicarbonate

sodium dithionite

water

→

3α-N-methyl-dihydronicotinoyloxy-5α-pregnan-20-one

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted several times with chloroform
2. 2
   WaschenThe combined organic layers were washed with potassium carbonate
3. 3
   Einengenconcentrated
4. 4
   FiltrationThe crude product was filtered through a bed of silica gel
5. 5
   Waschenhexane/ethyl acetate (5:1) elution
6. 6
   SonstigeThe product was recovered in the initial fractions
7. 7
   Sonstigeto give 180 mg (439 g/m, 0.4 mmol, 22%)

Vorschrift

To an ice cold solution of the 3α-N-methyl-nicotinoyloxy-5α-pregnan-20-one iodide salt (1.01 g, 562 g/m, 1.8 mmol) in 150 mL of aqueous methanol (100 mL methanol and 50 mL water, deaerated) was added sodium bicarbonate (620 mg, 84 g/m, 7.4 mmol) and sodium dithionite (1.3 g, 174 g/m, 7.4 mmol). This mixture was stirred at 0° C. for 1 h. The reaction mixture was poured into 500 mL of water and extracted several times with chloroform. The combined organic layers were washed with potassium carbonate and concentrated. The crude product was filtered through a bed of silica gel using hexane/ethyl acetate (5:1) elution. The product was recovered in the initial fractions to give 180 mg (439 g/m, 0.4 mmol, 22%).

Quelle