Synthesis of podophyllotoxin-glycosyl triazoles <i>via</i> click protocol mediated by silver (I)-<i>N</i>-heterocyclic carbenes and their anticancer evaluation as topoisomerase-II inhibitors
Herein we report the regioselective synthesis of podophyllotoxin-Glycosyl triazole hybrids catalysed by Ag(I)-N-heterocyclic carbene (Ag(I)-NHC) in a short reaction time (similar to 30 min) at ambient conditions. In principle, it is the first report of Click alkyne-azide cycloaddition catalysed by Ag(I)-NHC catalyst and moreover, this new methodology yielded good results when compared with traditional CuAAC in terms of reaction time and selectivity. The synthesised compounds were further explored for in vitro anticancer activity against four human cancer cell lines Du145, HeLa, A-549, and MCF-7 and found that these synthesised compounds possess significant anticancer activity. Further, the compounds 5a and 5e were identified as promising leads due to their better activity across all cell lines than that of the standard drug etoposide. Molecular docking studies of 5a & 5e with DNA Topoisomerase-II were revealed that the free energy calculations of active compounds were in good agreement with observed IC50 values.[GRAPHICS].
One-pot stereoselective synthesis of glycosyl azides via 1,2-cyclic sulfite
作者:Ahmed El Meslouti、Daniel Beaupère、Gilles Demailly、Raoul Uzan
DOI:10.1016/s0040-4039(00)76700-1
日期:1994.6
In a one-pot procedure, treatment of partially protected or unprotected aldoses with N,N'-thionyldiimidazole and then, lithium azide leads stereoselectively to glycosyl azides.
Azidation of some unprotected aldoses with the Ph(3)P-N-chlorosuccinimide-LiN3 system leads regioselectively to glycosyl azides; 1,2-trans compounds are obtained stereoselectively.