| 摘要 |
Compounds of formula (I) wherein R1is selected from H, C(=O)R', P(=O)R'R'', S(=O)R'R'', substituted or unsubstituted C1-C18 alkyl, substituted or unsubstituted C2-C18 alkenyl, substituted or unsubstituted C2-C18 alkynyl, or substituted or unsubstituted aryl; or R1 together with R2 forms a saturated or unsaturated heterocyclic ring; R2 and R3 are each, independently, selected from H, C(=O)R', P(=O)R'R'', S(=O)R'R'', substituted or unsubstituted C1-C18 alkyl, substituted or unsubstituted C2-C18 alkenyl, substituted or unsubstituted C2-C18 alkynyl, or substituted or unsubstituted aryl; or one of R2 or R3 together with R1 forms a saturated or unsaturated heterocyclic ring; or R2 and R3 together form a saturated or unsaturated heterocyclic ring; R4 is selected from H, C(=O)R', P(=O)R'R'', S(=O)R'R'', substituted or unsubstituted C1-C18 alkyl, substituted or unsubstituted C2-C18 alkenyl, substituted or unsubstituted C2-C18, alkynyl, or substituted or unsubstituted aryl, wherein R' is selected from the group consisting of H, OH, NO2, NH2, SH, CN, halogen, C(=O)H, C(=O)CH3, CO2H, CO2CH3, substituted or unsubstituted C1-C18 alkyl, substituted or unsubstituted C2-C18 alkenyl, substituted or unsubstituted C2-C18 alkynyl, substituted and unsubstituted aryl; R'' is selected from the group consisting of H, OH, NO2, NH2, SH, CN, halogen, =O, C(=O)H, C(=O)CH3, CO2H, CO2CH3, substituted or unsubstituted C1-C18 alkyl, substituted or unsubstituted C2-C18 alkenyl, substituted or unsubstituted C2-C18 |
