Palladium-Catalyzed Oxidative Carbonylative Coupling of Arylallenes, Arylboronic Acids, and Nitroarenes
作者:Hui-Qing Geng、Jin-Bao Peng、Xiao-Feng Wu
DOI:10.1021/acs.orglett.9b02925
日期:2019.10.18
In this Letter, a palladium-catalyzed multicomponent procedure for the selective synthesis of α-substituted α,β-unsaturated ketones has been developed. With readily available allenes, arylboronicacids, and nitroarenes as the substrates, the reaction proceeds selectively to the desired α-substituted enones. Notably, no manipulation of carbon monoxide gas is needed here, and Mo(CO)6 has been applied
A distinct copper-catalyzed boroacylation of allenes with acylchlorides and bis(pinacolato)diboron is developed. For aromatic acylchlorides, 1,2-boroacylation of allenes readily takes place, leading to the formation of tetrasubstituted vinylboronates with exclusive (E)-stereoselectivity. In comparison, the employment of alkyl acylchlorides as electrophiles alters the selectivity to 2,3-boroacylated
开发了一种独特的铜催化丙二烯与酰氯和双(频哪醇)二硼的硼酰化反应。对于芳族酰氯,丙二烯很容易发生 1,2-硼酰化,导致形成具有排他性 ( E )-立体选择性的四取代乙烯基硼酸酯。相比之下,使用烷基酰氯作为亲电试剂会改变对 2,3-硼酰化产物的选择性。此外,该产品可以很容易地进行 Suzuki-Miyaura 交叉偶联,得到完全保留构型的四取代烯烃。
Cobalt-Catalyzed C–H Activation and [3 + 2] Annulation with Allenes: Diastereoselective Synthesis of Indane Derivatives
作者:Arnab Dey、Chandra M. R. Volla
DOI:10.1021/acs.orglett.1c01521
日期:2021.7.2
ve [3 + 2] annulation reaction has been achieved, employing allenes as the annulation partners. The selective 2,3-migratory insertion of allenes with arylcobalt(III) species and the subsequent intramolecular diastereoselective nucleophilic addition of η1-allylcobalt onto the imine resulted in [3 + 2] annulation over the alternative [4 + 2] annulation. Furthermore, the oxidative annulation obviates
Synthesis of Terminal Allenes via a Copper-Catalyzed Decarboxylative Coupling Reaction of Alkynyl Carboxylic Acids
作者:Jeongah Lim、Jinseop Choi、Han-Sung Kim、In Seon Kim、Kye Chun Nam、Jimin Kim、Sunwoo Lee
DOI:10.1021/acs.joc.5b02361
日期:2016.1.4
Synthesis of terminal allenes via a copper-catalyzeddecarboxylativecoupling reaction was developed. Aryl alkynyl carboxylic acid, paraformaldehyde, and dicyclohexylamine were reacted with CuI (20 mol %) in diglyme at 100 °C for 2 h to produce the terminal allene in moderate to good yields. The method showed good functional group tolerance.
Preparation of (<i>E</i>)-1,3-Enyne Derivatives through Palladium Catalyzed Hydroalkynylation of Allenes
作者:Zhi-Kai Liu、Ying Yang、Zhuang-Ping Zhan
DOI:10.1021/acs.joc.1c02732
日期:2022.1.21
A general and efficient palladium catalyzed hydroalkynylation of allenes was developed to produce synthetically versatile (E)-1,3-enyne derivatives with highregio- and stereoselectivity. This catalytic system proceeded under mild conditions and was compatible with a broad range of substrates, especially for allenes without electron-bias groups. This work further broadens the synthetic potential of
开发了一种通用且有效的钯催化的丙二烯氢化炔基化反应,以生产具有高区域和立体选择性的合成通用 ( E )-1,3-烯炔衍生物。该催化体系在温和条件下进行,并且与广泛的底物相容,特别是对于没有电子偏压基团的丙二烯。这项工作进一步拓宽了这些支架在有机合成和药物化学中的合成潜力。