A Safe and Facile Route to Imidazole-1-sulfonyl Azide as a Diazotransfer Reagent
作者:Hui Ye、Ruihua Liu、Dongmei Li、Yonghui Liu、Haixin Yuan、Weikang Guo、Lifei Zhou、Xuefeng Cao、Hongqi Tian、Jie Shen、Peng George Wang
DOI:10.1021/ol3028708
日期:2013.1.4
A facile approach to the diazotransferreagent of imidazole-1-sulfonylazide was reported. The procedure was well optimized to clarify potential explosion risks. A high production yield as well as small batch variation was achieved even without careful pretreatment of reagents and solvents. HPLC and NMR methods to monitor the process were provided. These features made this protocol suitable for large
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].
Synthetic Glycolipids as Molecular Vaccine Adjuvants: Mechanism of Action in Human Cells and In Vivo Activity
作者:Fabio A. Facchini、Alberto Minotti、Andrea Luraghi、Alessio Romerio、Nicole Gotri、Alejandra Matamoros-Recio、Andrea Iannucci、Charys Palmer、Guanbo Wang、Rebecca Ingram、Sonsoles Martin-Santamaria、Grisha Pirianov、Marco De Andrea、Miguel A. Valvano、Francesco Peri