The present invention provides a process of preparing betulin-28-aldehyde from betulin. The process includes contacting betulin with a compound of formula (I), e.g., TEMPO (2,2,6,6-tetramethylpiperidine 1-oxyl) for a period of time effective to provide betulin-28-aldehyde. The present invention also provides a process of preparing betulinic acid. The process includes contacting betulin with a composition that includes: sodium hypochlorite (NaOCl); sodium chlorite (NaClO
2
), potassium chlorite (KClO
2
), or a combination thereof; and a compound of formula (I), e.g., TEMPO (2,2,6,6-tetramethylpiperidine 1-oxyl); for a period of time effective to provide betulinic acid.
本发明提供了一种从
白桦酸制备白桦醛的方法。该方法包括将
白桦酸与式(I)的化合物接触,例如
TEMPO(
2,2,6,6-四甲基哌啶1-氧自由基),以有效时间提供白桦醛。本发明还提供了一种制备
白桦酸的方法。该方法包括将
白桦酸与包括:
次氯酸钠(NaOCl);
次氯酸钠(NaClO2)、
次氯酸钾(KClO2)或其组合物;以及式(I)的化合物,例如
TEMPO(
2,2,6,6-四甲基哌啶1-氧自由基)的组合物接触,以有效时间提供
白桦酸。