Iodoarenes are versatile intermediates and common synthetic targets in organic synthesis. Here, we present a strategy for selective C–H iodination of (hetero)arenes with a broad functional group tolerance. We demonstrate the utility and differentiation to other iodination methods of supposed sulfonyl hypoiodites for a set of carboarenes and heteroarenes.
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。
Gold (I/III)‐Catalyzed Trifluoromethylthiolation and Trifluoromethylselenolation of Organohalides
作者:Sagar R. Mudshinge、Yuhao Yang、Bo Xu、Gerald B. Hammond、Zhichao Lu
DOI:10.1002/anie.202115687
日期:2022.3.14
The first gold(I/III)-catalyzed direct trifluoromethylthiolation and trifluoromethylselenolation of organohalides are reported. This mild and efficient protocol enjoys a broad substrate scope and high yield (>60 examples with up to 97 % isolated yield). Its robustness was demonstrated by the late-stage functionalization of various bioactive molecules, which makes this reaction applicable to pharmaceutical
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
Deprotonative metalation of substituted aromatics using mixed lithium–cobalt combinations
作者:Gandrath Dayaker、Floris Chevallier、Philippe C. Gros、Florence Mongin
DOI:10.1016/j.tet.2010.09.053
日期:2010.11
The deprotonation of anisole was attempted using different homo- and heteroleptic TMP/Bu mixed lithium–cobalt combinations. Using iodine to intercept the metalated anisole, an optimization of the reaction conditions showed that in THF at room temperature 2 equiv of base were required to suppress the formation of the corresponding 2,2′-dimer. The origin of the dimer was not identified, but its formation