The present invention provides compounds according to formula I:
and pharmaceutically acceptable salts thereof. For compounds of formula I, R1 and R2 are independently selected from the group consisting of H, —C(═O)—(CH2)2-aryl, and —C(═O)—(CH2)n—C(═O)—NH-aryl. The subscript n is from 2 to 6. R3 is selected from the group consisting of H and —C(═O)—O—R4; and R4 is selected from the group consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, arylalkyl, substituted arylalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, heteroalkyl and substituted heteroalkyl. Compounds are provided wherein at least one of R1 and R2 is other than H. Pharmaceutical compositions, methods for inhibiting the growth of cancer cells, and methods for the treatment of cancer are also provided.
本发明提供了公式I的化合物及其药学上可接受的盐。对于公式I的化合物,R1和R2分别选自H,—C(═O)—(
CH2)2-芳基和—C(═O)—( )n—C(═O)—NH-芳基。下标n为2至6。R3选自H和—C(═O)—O—R4;R4选自烷基,取代烷基,烯基,取代烯基,炔基,取代炔基,芳基烷基,取代芳基烷基,环杂芳基烷基,取代环杂芳基烷基,杂基和取代杂基。提供了至少其中之一的R1和R2不是H的化合物。还提供了药物组合物、抑制癌细胞生长的方法以及治疗癌症的方法。