作者:N. V. Galaiko、A. V. Nazarov、I. A. Tolmacheva、P. A. Slepukhin、Yu. B. Vikharev、O. A. Maiorova、V. V. Grishko
DOI:10.1007/s10593-014-1449-8
日期:2014.4
Lupane and 18 alpha H-oleanane alpha-hydroximino ketones were used to synthesize derivatives condensed at ring A with a substituted azole fragment, namely, C(2)-C(3)-fused oxazoles and 1,2,3-triazoles. Triterpene isoxazoles fused at the C(1)-C(2) bond are described for the first time. An optimized method was proposed for the synthesis of unsubstituted 1,2,3-triazoles, displaying cytotoxic activity (IC50 8.4-40.7 mu M) relative to rhabdomyosarcoma, lung carcinoma, and MS melanoma cell lines.
Lupane and 18α-oleanane derivatives substituted in the position 2, their cytotoxicity and influence on cancer cells
substituted in the position 2. From betulin, we obtained 2-bromo dihydrobetulonic acid and 2-bromo allobetulon and their substitutions yielded derivatives with various substituents in the position 2 such as amines, amides, thiols, and thioethers. Nitration of allobetulon and dihydrobetulonic acid gave 2-nitro and 2,2-dinitro derivatives. Fifteen derivatives had IC50 < 50 μM on a chemosensitive CCRF-CEM (acute