A straightforward method for the synthesis of highlyfunctionalizedvinylarenes through palladium‐catalyzed, norbornene‐mediated CHactivation/carbene migratory insertion is described. Extension to a one‐pot procedure is also developed. Furthermore, this method can also be used to generate polysubstituted bicyclic molecules. The reaction proceeds under mild conditions to give the products in satisfactory
Metal‐Free Electrochemical Synthesis of Sulfonamides Directly from (Hetero)arenes, SO
<sub>2</sub>
, and Amines
作者:Stephan P. Blum、Tarik Karakaya、Dieter Schollmeyer、Artis Klapars、Siegfried R. Waldvogel
DOI:10.1002/anie.202016164
日期:2021.3
Sulfonamides are among the most important chemical motifs in pharmaceuticals and agrochemicals. However, there is no methodology to directly introduce the sulfonamide group to a non‐prefunctionalized aromatic compound. Herein, we present the first dehydrogenative electrochemicalsulfonamidesynthesis protocol by exploiting the inherent reactivity of (hetero)arenes in a highly convergent reaction with
Synthesis of C4-Substituted Indoles via a Catellani and C–N Bond Activation Strategy
作者:Bo-Sheng Zhang、Fan Wang、Ying-Hui Yang、Xue-Ya Gou、Yi-Feng Qiu、Xi-Cun Wang、Yong-Min Liang、Yuke Li、Zheng-Jun Quan
DOI:10.1021/acs.orglett.0c02897
日期:2020.11.6
This paper describes the case of a cross study between the C–N bond cleavage reaction field and the Catellani–Lautens reaction system. A series of highly functionalized C4-substituted indoles were synthesized using this strategy. By screening the alkyl groups of amines, the energy barrier of C–N bond cleavage reaction was reduced and the corresponding allenization products were avoided. Finally, the
本文描述了C–N键断裂反应场与Catellani–Lautens反应系统之间交叉研究的案例。使用该策略合成了一系列高度官能化的C4-取代的吲哚。通过筛选胺的烷基,可减少C–N键断裂反应的能垒,并避免了相应的变态反应产物。最后,密度泛函理论计算表明,惰性C–N键活化反应不是协同过程。相反,偶联反应首先生成吲哚季铵盐,然后通过S N 2过程发生C–N键断裂。
Diastereoselective Synthesis of Dibenzoazepines through Chelation on Palladium(IV) Intermediates
Joint palladium/norbornene organometallic catalysis allows for straightforward access to dibenzo[c,e]azepines. These synthetically challenging polycyclic frameworks form in one pot via a three-component coupling of an aryl iodide, a bromobenzylamine, and an olefin. A key, atroposelective aryl–aryl coupling from chelated Pd(IV) intermediates dictates the outcome of the cascade. DFT modeling sheds light
One-Pot Palladium-Catalyzed Synthesis of Selectively Substituted Phenanthridines by Sequential Aryl-Aryl and Heck Couplings, Aza-Michael and Retro-Mannich Reactions
作者:Nicola Della Ca'、Elena Motti、Antonio Mega、Marta Catellani
DOI:10.1002/adsc.201000114
日期:——
A catalytic synthesis of selectivelysubstitutedphenanthridines is achieved through a reaction sequence involving palladium/norbornene‐catalyzed unsymmetrical aryl‐aryl and Heckcouplings followed by aza‐Michael and retro‐Mannich reactions. In spite of the many steps involved the method is very simple and allows the formation of selectivelysubstitutedphenanthridines under mild conditions in a straightforward