Transition-Metal-Free Borylation of Aryl Bromide Using a Simple Diboron Source
作者:Taeho Lim、Jeong Yup Ryoo、Min Su Han
DOI:10.1021/acs.joc.0c01065
日期:2020.8.21
reaction of aryl bromides. Bis-boronic acid (BBA), was used, and the borylation reaction was performed using a simple procedure at a mild temperature. Under mild conditions, aryl bromides were converted to arylboronic acids directly without any deprotection steps and purified by conversion to trifluoroborate salts. The functional group tolerance was considerably high. The mechanism study suggested that
Catalyst free, base free microwave irradiated synthesis of aryl nitrites from potassium aryltrifluoroborates and bismuth nitrate
作者:Mohammad Al-Masum、Rebecca L. Welch
DOI:10.1016/j.tetlet.2014.01.102
日期:2014.3
A mixture of bismuth nitrate pentahydrate and potassium aryltrifluoroborate in toluene under microwave heating at 120 °C for 20 min provides an interesting and mild reaction protocol for the synthesis of aryl nitrite. The conversion to aryl nitritesfrom aryltrifluoroborates without transition metal catalyst and base in high yields is remarkable.
Refining boron–iodane exchange to access versatile arylation reagents
作者:Shubhendu S. Karandikar、David R. Stuart
DOI:10.1039/d1cc06341c
日期:——
Aryl(Mes)iodonium salts, which are multifaceted aryl transfer reagents, are synthesized via boron-iodane exchange. Modification to both the nucleophilic (aryl boron) and electrophilic (mesityl–λ3–iodane) reaction components results in improved yield and faster reaction time compared to previous conditions. Mechanistic studies reveal a pathway that is more like transmetallation than SEAr.
芳基(中)碘鎓盐是多面芳基转移试剂,通过硼-碘交换合成。与以前的条件相比,对亲核(芳基硼)和亲电子(异丙叉基-λ 3 -碘)反应组分的改性可提高产率并加快反应时间。机理研究揭示了一种更像金属转移而不是 S E Ar 的途径。
Mechanochemical Defluorinative Arylation of Trifluoroacetamides: An Entry to Aromatic Amides
作者:Satenik Mkrtchyan、Mohanad Shkoor、Mandalaparthi Phanindrudu、Miroslav Medved′、Olena Sevastyanova、Viktor O. Iaroshenko
DOI:10.1021/acs.joc.2c02197
日期:2023.1.20
salts, or dimethyl(phenyl)sulfonium salts with trifluoroacetamides affords substituted aromatic amides in good to excellent yields. These nickel-catalyzedreactions are enabled by C–CF3 bond activation using Dy2O3 as an additive. The current protocol provides versatile and scalable routes for accessing a wide variety of substituted aromatic amides. Moreover, the protocol described in this work overcomes
酰胺键在天然和合成有机分子中很突出,在各个领域都具有活性。在众多的酰胺合成方法中,取代预先存在的 (O)C-N 部分是一种尚未开发的酰胺合成策略。在这项工作中,我们公开了一种用于脂肪族和芳香族三氟乙酰胺脱氟芳基化产生芳香族酰胺的新方案。芳基硼酸、三甲氧基苯基硅烷、二芳基碘盐或二甲基(苯基)锍盐与三氟乙酰胺的机械化学诱导反应以良好至极好的收率提供取代的芳族酰胺。这些镍催化的反应是通过使用 Dy 2 O 3的 C–CF 3键活化来实现的作为添加剂。当前的协议提供了通用且可扩展的路线,用于访问各种取代的芳香酰胺。此外,这项工作中描述的协议克服了先前报告的方法中的缺点和局限性。
Pd-Catalyzed C-3 functionalization of indolizines via C–H bond cleavage
作者:Baoli Zhao
DOI:10.1039/c2ob25643f
日期:——
New transition metal-catalyzed methods for the arylation of indolizines by the direct cleavage of CâH bonds have been developed. A wide range of aryltrifluoroborate salts react with indolizines in the presence of Pd(OAc)2 catalyst and AgOAc oxidant to give the arylated indolizines in high yields. Both electron-donating and electron-withdrawing groups perform smoothly while bromide and chlorine substituents are tolerated. In addition, the indolizines display similar reactivities in the Pd-catalyzed reaction with 3-phenylpropiolic acid to afford the corresponding C-3 alkynylated indolizines. These methods allow the direct functionalization of indolizines in one step.