Synthesis of triazolylmethyl-linked nucleoside analogs via combination of azidofuranoses with propargylated nucleobases and study on their cytotoxicity
Copper(I)-catalyzed azide–alkyne 1,3-dipolar cycloaddition reactions (CuAAC) between azidofuranoses and propargyl-nucleobases were carried out in the presence of CuSO4·5H2O and sodium ascorbate as catalytic system to provide the corresponding 1,4-disubstituted-1,2,3-triazole-bridged nucleoside analogs in good yields. Twelve new sugar-based triazolylmethyl-linked nucleoside analogs were synthesized
15d could reverse drug resistance by inhibiting MDR1, ABCC1 and ABCG2 to increase the intracellular drug accumulation and induce apoptosis of Bel-7402/5-FU cells through mitochondria mediated pathway. On the base of these results, compound 15d is deserved to be further investigated as a potential anti-HCC lead compound for ultimate discovery of pathenolide-based anti-cancerdrug.
Efficient and selective catalytic N-Alkylation of pyrimidine by ammonium Sulfate@Hydro-thermal carbone under eco-friendly conditions
作者:SOUMIA BELKHARCHACH、HANA IGHACHANE、ABDESSADEK LACHGAR、MUSTAPHA AIT ALI、HASSAN B LAZREK
DOI:10.1007/s12039-020-01776-3
日期:2020.12
An efficient and inexpensive method for the N-alkylation of pyrimidines using ammonium sulfate coated Hydro-Thermal-Carbone (HTC) (AS@HTC) as reused heterogeneous catalyst was developed. The catalyst was characterized by several analytical techniques such as SEM, XRD, and FTIR. The effect of various parameters was studied including catalyst loading, mole ratio, to achieve excellent selectivity and yields in 80–90%. Significantly, the present protocol offers the use of an inexpensive and environmentally friendly catalyst and simple workup. The simplicity of the procedure, excellent yield of the products, and the recyclability of the catalyst are the main advantages of this method. Ammonium sulfate coated Hydro-Thermal-Carbone (HTC) (AS@HTC); an efficient and reused heterogeneous catalyst of the N-alkylation of pyrimidines was developed. Excellent selectivity and yields (80–90%) toward N1-alkylpyrimidines were achieved. Significantly, the present protocol offers the use of an inexpensive and environmentally friendly catalyst and simple workup.
Plasmonically Coupled Nanoreactors for NIR-Light-Mediated Remote Stimulation of Catalysis in Living Cells
作者:Amit Kumar、Sumit Kumar、Nitee Kumari、Seon Hee Lee、Jay Han、Issac J. Michael、Yoon-Kyoung Cho、In Su Lee
DOI:10.1021/acscatal.8b04005
日期:2019.2.1
remotely operable and biocompatible energy source are needed to leverage the chemical diversity and expediency of advanced chemical synthesis in biology and medicine. Here, we designed and synthesized plasmonically integrated nanoreactors (PINERs) with highly tunable structure and NIR-light-induced synergistic function for efficiently promoting unnatural catalytic reactions inside living cells. We devised
on these findings, we propose a generalstrategy for integrated bioorthogonalprodrugs and accordingly design a prodrug 16, in which a Pt(IV) moiety is covalently connected with an O2-propargyl diazeniumdiolate moiety. It is found that 16 can be specifically reduced by cytoplasmic reductants in human ovarian cancer cells to liberate cisplatin, which subsequently stimulates the cleavage of O2-propargyl