Photoinduced Miyaura Borylation by a Rare-Earth-Metal Photoreductant: The Hexachlorocerate(III) Anion
作者:Yusen Qiao、Qiaomu Yang、Eric J. Schelter
DOI:10.1002/anie.201804022
日期:2018.8.20
photoreductant, a Miyaura borylation, has been achieved. This simple, scalable, and novel borylation method that makes use of the hexachlorocerate(III) anion ([CeIIICl6]3−, derived from CeCl3) has a broad substrate scope and functional‐group tolerance and can be conducted at room temperature. Combined with Suzuki–Miyaura cross‐coupling, the method is applicable to the synthesis of various biaryl products, including
稀土金属光还原剂Miyaura硼酸盐化反应实现了第一个光诱导的碳(sp 2)-杂原子键形成反应。这种简单,可扩展且新颖的硼酸化方法利用六氯cerate(III)阴离子([Ce III Cl 6 ] 3−,源自CeCl 3),具有广泛的底物范围和官能团耐受性,可以在室温下进行温度。结合Suzuki-Miyaura交叉偶联,该方法适用于各种联芳基产物的合成,包括通过使用芳基氯化物底物。
Scalable, Metal- and Additive-Free, Photoinduced Borylation of Haloarenes and Quaternary Arylammonium Salts
作者:Adelphe M. Mfuh、John D. Doyle、Bhuwan Chhetri、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/jacs.6b01376
日期:2016.3.9
We report herein a simple, metal- and additive-free, photoinduced borylation of haloarenes, including electron-rich fluoroarenes, as well as arylammoniumsalts directly to boronic acids. This borylation method has a broad scope and functional group tolerance. We show that it can be further extended to boronic esters and carried out on gram scale as well as under flow conditions.
Palladium(0)-Mediated Rapid Methylation and Fluoromethylation on Carbon Frameworks by Reacting Methyl and Fluoromethyl Iodide with Aryl and Alkenyl Boronic Acid Esters: Useful for the Synthesis of [<sup>11</sup>C]CH<sub>3</sub>C- and [<sup>18</sup>F]FCH<sub>2</sub>C-Containing PET Tracers (PET=Positron Emission Tomography)
methylation and fluoromethylation on aryl and alkenyl frameworks by using methyl and fluoromethyl iodide with an organoboronic acid ester has been developed under the simple and mild conditions of [Pd2(dba)3]/P(o‐CH3C6H4)3/K2CO3 (dba= dibenzylideneacetone) in DMF at 60 °C for 5 min (see scheme). This boron protocol provides a firm chemical basis for the synthesis of 11C‐ and 18F‐incorporated PET tracers.
在简单温和的 [Pd 2 (dba) 3 ]/P( o ‐CH )条件下,开发了一种新的合成方法,利用甲基和氟甲基碘与有机硼酸酯在芳基和烯基骨架上进行快速甲基化和氟甲基化3 C 6 H 4 ) 3 /K 2 CO 3 (dba=二亚苄基丙酮)在DMF中在60°C下5分钟(参见方案)。该硼方案为合成11 C 和18 F 的 PET 示踪剂提供了坚实的化学基础。
3-Iodo-3-trimethylsilylpropenal as a Useful Unit for Pinacol Coupling and Subsequent Functional Group Transformations
Titanium tetraiodidesilyl-mediated pinacol coupling reaction of (Z)-3-iodo-3-trimethylsilylpropenal is used for the preparation of trans-4,5-bis[(Z)-2-iodo-2-(trimethylsilyl)vinyl]-2,2-dimethyl-1,3-dioxolane, which is utilized for the subsequent C–C bond-forming reactions.
Decarboxylative Borylation of Stabilized and Activated Carbon Radicals
作者:Qiang Zhang、Xiaojuan Li、Weigang Zhang、Shengyang Ni、Yi Wang、Yi Pan
DOI:10.1002/anie.202008138
日期:2020.12
aliphatic and aromatic boronic esters by mild photoinduced decarboxylativeborylation. Both aryl and alkyl radicals could be generated from the leaving group‐assisted N‐hydroxybenzimidoyl chloride esters, even α‐CF3 substituted substrates could be activated for further elaboration.