作者:William I. Nicholson、Fabien Barreteau、Jamie A. Leitch、Riley Payne、Ian Priestley、Edouard Godineau、Claudio Battilocchio、Duncan L. Browne
DOI:10.1002/anie.202106412
日期:2021.9.27
The direct mechanochemical amidation of esters by ball milling is described. The operationally simple procedure requires an ester, an amine, and substoichiometric KOtBu and was used to prepare a large and diverse library of 78 amide structures with modest to excellent efficiency. Heteroaromatic and heterocyclic components are specifically shown to be amenable to this mechanochemical protocol. This
Rhodium‐Catalyzed Electrooxidative C−H Olefination of Benzamides
作者:Yan Zhang、Julia Struwe、Lutz Ackermann
DOI:10.1002/anie.202005257
日期:2020.8.24
Metal‐catalyzed chelation‐assisted C−H olefinations have emerged as powerful tools for the construction of functionalized alkenes. Herein, we describe the rhoda‐electrocatalyzedC−H activation/alkenylation of arenes. The olefinations of challenging electron‐poor benzamides were thus accomplished in a fully dehydrogenative fashion under electrochemical conditions, avoiding stoichiometric chemical oxidants
金属催化螯合辅助的 C-H 烯化已成为构建功能化烯烃的有力工具。在此,我们描述了 rhoda 电催化芳烃的 C-H 活化/烯基化。因此,具有挑战性的贫电子苯甲酰胺的烯烃化在电化学条件下以完全脱氢的方式完成,避免了化学计量的化学氧化剂,并且 H 2作为唯一的副产物。这种通用的烯基化反应还具有广泛的底物范围和使用电力作为绿色氧化剂。
Silver-Catalyzed Hydroboration of C–X (X = C, O, N) Multiple Bonds
作者:Vipin K. Pandey、Chandra Shekhar Tiwari、Arnab Rit
DOI:10.1021/acs.orglett.1c00106
日期:2021.3.5
AgSbF6 was developed as an effective catalyst for the hydroboration of various unsaturated functionalities (nitriles, alkenes, and aldehydes). This atom-economic chemoselective protocol works effectively under low catalyst loading, base- and solvent-free moderate conditions. Importantly, this process shows excellent functional group tolerance and compatibility with structurally and electronically diverse
A metal-free approach for the synthesis of amides/esters with pyridinium salts of phenacyl bromides via oxidative C–C bond cleavage
作者:Kesari Lakshmi Manasa、Yellaiah Tangella、Namballa Hari Krishna、Mallika Alvala
DOI:10.3762/bjoc.15.182
日期:——
O-benzoylation of various amines/benzyl alcohols with pyridinium salts of phenacyl bromides is demonstrated to generate the corresponding amides and esters. This protocol facilitates the oxidative cleavage of a C–C bond followed by formation of a new C–N/C–O bond in the presence of K2CO3. Various pyridinium salts of phenacyl bromides can be readily transformed into a variety of amides and esters which is an
用苯甲酰溴的吡啶鎓盐对各种胺/苄醇进行N-和O-苯甲酰化的有效,简单和无金属的合成方法被证明可以生成相应的酰胺和酯。该方案有助于在存在K 2 CO 3的情况下促进C–C键的氧化裂解,然后形成新的C–N / C–O键。苯甲酰溴的各种吡啶鎓盐可以很容易地转化为各种酰胺和酯,这是有机合成中常规酰胺化和酯化的另一种方法。高官能团耐受性,广泛的底物范围和操作简便性是当前方案的突出优点。
Highly Efficient Copper-Catalyzed Amidation of Benzylic Hydrocarbons Under Neutral Conditions
作者:Eva-Louise Howard、Norman Guzzardi、Viliyana G. Tsanova、Angeliki Stika、Bhaven Patel
DOI:10.1002/ejoc.201701759
日期:2018.2.14
A ligand free method has been developed for the amidation of benzylichydrocarbons. A range of benzylicamides has been prepared with the use of dicumyl peroxide and a copper catalyst in good to excellent yields.