Hydrogen Peroxide → 1H-Pyrano(3',4':6,7)indolizino(1,2-b)quinoline-3,14(4H,12H)-dione, 4-ethyl-4-hydroxy-11-(hydroxymethyl)-, (S)-

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Camptothecin (20.0 g) was dissolved in mixture of methanol (750 mL), water (500 mL), conc. H2SO4 (500 mL) and finely ground FeSO4 (16.0 g) and hydrogen peroxide (100 mL 30% solution) was added dropwise over the course of 2 h and the reaction mixture was allowed to stir for another hour. The reaction mixture was then filtered through a sintered glass funnel to remove all undissolved material. The resultant filtrate was then cooled to 0° C. and NaOH (375 g) in 1 L water was added slowly with vigorous stirring. The yellow-brown solid was then filtered, washed with water and pumped to dryness. The resultant crude product was then placed in a 1 L erlenmyer flask, DMF (300 mL) added and warmed to 110° C. Once the solid is dispersed into small particles, acetonitrile (500 mL) was added and the mixture heated until boiling. The mixture was then allowed to cool to room temperature then 0° C., filtered and the solid washed with chloroform to provide 7-hydroxymethylcamptothecin (21.50 g, 99%) as a pale yellow solid.

Herkunft & Nachweise