| 摘要 |
The present invention relates to a method for preparation of betulinic acid from betulin. The method comprises oxidizing betulin to betulinic acid with a catalyst of formula (5), e.g. 2,2,6,6-tetramethylpiperidine 1 - oxyl (TEMPO), in the presence of a hypervalent iodine reagent as oxidant. |
