二芳基甲烷和三芳基甲烷是许多领域中一类重要的化合物。在这里,我们报道了一种有效的光诱导芳基化(烷基化),用于借助 Cs 2 CO 3从容易获得的N-磺酰腙和芳基/烷基硼酸合成二芳基甲烷、双(二芳基甲基)苯、芳基烷基甲烷和三芳基甲烷。在光存在下,二芳基甲烷的合成也可以通过三组分方法以一锅法从醛合成,收率良好。此外,我们还通过合成有机硼化合物和2°-醇证明了其合成实用性。
Visible-light-induced cross-coupling of aryl iodides with hydrazones <i>via</i> an EDA-complex
作者:Pan Pan、Shihan Liu、Yu Lan、Huiying Zeng、Chao-Jun Li
DOI:10.1039/d2sc01909d
日期:——
photosensitizer-free cross-coupling of aryl iodides with hydrazones was developed. In this strategy, hydrazones were used as alternatives to organometallic reagents, in the absence of a transition metal or an external photosensitizer, making this cross-coupling mild and green. The protocol was compatible with a variety of functionalities, including methyl, methoxy, trifluoromethyl, halogen, and heteroaromatic
cross-coupling of thiol derivatives with aryl bromides has now been established. This procedure provides access to simple and complex unsymmetrical diarylmethane molecules under mild reaction conditions with a broad functional group tolerance. The key steps of the reaction involve a silane-mediated halogen-atom transfer (XAT) and a subsequent intramolecular homolytic substitution (SH), forming C-centered
金属光氧化还原过程已成为 C−C 键形成的有效方法。现在已经建立了硫醇衍生物与芳基溴的 Ni-光氧化还原催化脱硫交叉偶联。该过程提供了在具有广泛的官能团耐受性的温和反应条件下获得简单和复杂的不对称二芳基甲烷分子的途径。反应的关键步骤涉及硅烷介导的卤素原子转移 (XAT) 和随后的分子内均裂取代 ( SH ),如机理研究所示,从各种硫醇衍生物形成以C为中心的自由基。这项研究为大量天然存在的硫醇的新转化铺平了道路。
3-Indolylphosphines as ligand for palladium in Suzuki–Miyaura coupling reaction of chloroarenes: substituent effects
作者:Debajyoti Saha、Raju Ghosh、Amitabha Sarkar
DOI:10.1016/j.tet.2013.03.030
日期:2013.5
The ligand 1,3-bis(diphenylphosphino)-1H-indole, L1 with palladium promotes Suzuki-Miyaura coupling reaction of chloroarenes and benzyl chlorides with arylboronic acids. Structural modification of L1 established that the phosphine group at C-3 position of indole was crucial to catalysis and its efficacy depended on the nature of the N-substituent. P-31 chemical shift values of the substituted indolylphosphines appear to show a correlation with observed trend in catalytic efficiency. (C) 2013 Elsevier Ltd. All rights reserved.