通过铜催化在不同条件下研究了吡咯与3-碘-4-甲氧基吡啶的N-芳基化反应。最佳条件被证明是协议A(CuI,DMEDA或TMEDA,K 3 PO 4,DMF在110°C)以及最重要的协议B(Cu 2 O,Cs 2 CO 3,DMSO在110°C),用于合成各种N-(甲氧基吡啶基)吡咯,吲哚和苯并咪唑。通过评估从1开始的含碳碘上的部分正电荷,可以合理化不同碘化甲氧基吡啶的行为相应的脱碘底物的1 H NMR化学位移。接下来,将反应与去碘原化-碘分解步骤连接,生成碘化的甲氧基吡啶:粗的碘代中间体直接参与吡咯N-芳基化,以良好的产率提供了预期的N-(甲氧基吡啶基)吡咯。几种合成的N-(甲氧基吡啶基)唑在A2058黑色素瘤细胞中发挥低至中等的抗增殖活性。
通过铜催化在不同条件下研究了吡咯与3-碘-4-甲氧基吡啶的N-芳基化反应。最佳条件被证明是协议A(CuI,DMEDA或TMEDA,K 3 PO 4,DMF在110°C)以及最重要的协议B(Cu 2 O,Cs 2 CO 3,DMSO在110°C),用于合成各种N-(甲氧基吡啶基)吡咯,吲哚和苯并咪唑。通过评估从1开始的含碳碘上的部分正电荷,可以合理化不同碘化甲氧基吡啶的行为相应的脱碘底物的1 H NMR化学位移。接下来,将反应与去碘原化-碘分解步骤连接,生成碘化的甲氧基吡啶:粗的碘代中间体直接参与吡咯N-芳基化,以良好的产率提供了预期的N-(甲氧基吡啶基)吡咯。几种合成的N-(甲氧基吡啶基)唑在A2058黑色素瘤细胞中发挥低至中等的抗增殖活性。
Deprotometalation of substituted pyridines and regioselectivity-computed CH acidity relationships
作者:Madani Hedidi、Ghenia Bentabed-Ababsa、Aïcha Derdour、Yury S. Halauko、Oleg A. Ivashkevich、Vadim E. Matulis、Floris Chevallier、Thierry Roisnel、Vincent Dorcet、Florence Mongin
DOI:10.1016/j.tet.2016.03.022
日期:2016.4
Interestingly, clean dideprotonation was noted from 3-fluoropyridine (at C2 and C4) and 2,6-difluoropyridine (at C3 and C5). The obtained regioselectivities have been discussed in light of the CH acidities of the substrates, determined both in the gas phase (DFT B3LYP and G3MP2B3 levels) and in THF solution. In the case of methoxypyridines, the pKa values have also been calculated for complexes with
Catechols and 3-hydroxypyridones as inhibitors of the DNA repair complex ERCC1-XPF
作者:Timothy M. Chapman、Kevin J. Gillen、Claire Wallace、Maximillian T. Lee、Preeti Bakrania、Puneet Khurana、Peter J. Coombs、Laura Stennett、Simon Fox、Emilie A. Bureau、Janet Brownlees、David W. Melton、Barbara Saxty
DOI:10.1016/j.bmcl.2015.08.031
日期:2015.10
Catechol-based inhibitors of ERCC1-XPF endonuclease activity were identified from a high-throughput screen. Exploration of the structure-activity relationships within this series yielded compound 13, which displayed an ERCC1-XPF IC50 of 0.6 mu M, high selectivity against FEN-1 and DNase I and activity in nucleotide excision repair, cisplatin enhancement and gamma H2AX assays in A375 melanoma cells. Screening of fragments as potential alternatives to the catechol group revealed that 3-hydroxypyridones are able to inhibit ERCC1-XPF with high ligand efficiency, and elaboration of the hit gave compounds 36 and 37 which showed promising ERCC1-XPF IC50 values of <10 mu M. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis of N-pyridyl azoles using a deprotometalation-iodolysis-N-arylation sequence and evaluation of their antiproliferative activity in melanoma cells
N-Arylation of pyrrole with 3-iodo-4-methoxypyridine was investigated by copper catalysis under different conditions. The best conditions, that proved to be protocol A (CuI, DMEDA or TMEDA, K3PO4, DMF at 110 °C) and above all protocol B (Cu2O, Cs2CO3, DMSO at 110 °C), were applied to the synthesis of various N-(methoxypyridyl) pyrroles, indoles and benzimidazoles. The behavior of the different iodinated
通过铜催化在不同条件下研究了吡咯与3-碘-4-甲氧基吡啶的N-芳基化反应。最佳条件被证明是协议A(CuI,DMEDA或TMEDA,K 3 PO 4,DMF在110°C)以及最重要的协议B(Cu 2 O,Cs 2 CO 3,DMSO在110°C),用于合成各种N-(甲氧基吡啶基)吡咯,吲哚和苯并咪唑。通过评估从1开始的含碳碘上的部分正电荷,可以合理化不同碘化甲氧基吡啶的行为相应的脱碘底物的1 H NMR化学位移。接下来,将反应与去碘原化-碘分解步骤连接,生成碘化的甲氧基吡啶:粗的碘代中间体直接参与吡咯N-芳基化,以良好的产率提供了预期的N-(甲氧基吡啶基)吡咯。几种合成的N-(甲氧基吡啶基)唑在A2058黑色素瘤细胞中发挥低至中等的抗增殖活性。