Nickel-Catalyzed Domino Heck Cyclization/Suzuki Coupling for the Synthesis of 3,3-Disubstituted Oxindoles
作者:Yuxiu Li、Kuai Wang、Yuanyuan Ping、Yifan Wang、Wangqing Kong
DOI:10.1021/acs.orglett.7b03713
日期:2018.2.16
The first nickel-catalyzed domino Heck cyclization/Suzukicoupling reaction for the synthesis of 3,3-disubstituted oxindoles bearing quaternary all-carbon centers is reported. A wide range of electrophiles, such as aryl iodides, bromides, triflates, and chlorides, are all compatible with the reaction conditions. Moreover, cheap aryl esters, which undergo catalytic C–O bond cleavage, could also be employed
sequential arylation–allylation of o-bromoanilides and leads to the construction of oxindolesbearing a full carbonquaternarycenter. The cheap triphenylphosphine was proved to be a highly effective ligand for this one pot transformation. On the basis of this new method, esermethole and its analogues were synthesized.
Catalytic Double Stereoinduction in Asymmetric Allylic Alkylation of Oxindoles
作者:Barryâ M. Trost、Yong Zhang
DOI:10.1002/chem.200902770
日期:2010.1.4
A highly regio‐, diastereo‐, and enantioselective allylicalkylation reaction of 3‐monosubstituted oxindoles catalyzed by molybdenum is described. The reaction is affected by the electronic and steric variations of the nucleophile. The use of appropriate N‐protecting group is particularly important for achieving high regio‐ and diastereoselectivity. Products from this reaction, containing vicinal quaternary‐tertiary
描述了钼催化的 3-单取代羟吲哚的高度区域、非对映和对映选择性烯丙基烷基化反应。该反应受到亲核试剂的电子和空间变化的影响。使用适当的 N 保护基团对于实现高区域和非对映选择性特别重要。该反应的产物含有邻位季-叔立构中心,是有价值的合成中间体,应该在生物碱合成中得到应用。
Visible‐Light‐Induced Photoredox Dehydrative Coupling/Cyclization of N‐Arylacrylamides with Hydroxyketones
A mild visible-light induced 4CzIPN/H+ photoredox system has been developed that enables hydroxyketones serving as a carbon radical precursor via formal C−O bond cleavage. This process was successfully exploited in the coupling/cyclization reaction of N-arylacrylamides and thereby provided a viable access to acyl oxindoles. This protocol features advantages including no need for any metal catalyst
已开发出一种温和的可见光诱导 4CzIPN/H +光氧化还原系统,使羟基酮能够通过正式的 C−O 键裂解充当碳自由基前体。该过程已成功用于 N-芳基丙烯酰胺的偶联/环化反应,从而为酰基羟吲哚提供了可行途径。该方案的优点包括不需要任何金属催化剂和添加剂、高产率、广泛的底物范围、克可扩展性以及 H 2 O 作为唯一副产物的释放。
A General Protocol toward Oxindoles Bearing C3‐Allylic Quaternary Stereocenter via Domino Reaction: A Concise Synthesis of Heterocycle‐Fused Indoline Alkaloids
efficiently catalytic method toward the synthesis of indolin-2-ones featuring an allylic derived C3-quaternary stereocenter via an intramolecular Heck cyclization/Suzuki coupling of N-substituted-N-(2-bromophenyl)acrylamides and organoboron reagents was successfully developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr)-ligated oxazoline palladacycle. It enabled a very broad