Palladium-Catalyzed Allenamide Carbopalladation/Allylation with Active Methine Compounds
作者:Xiaoyi Zhu、Ruibo Li、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.1c01369
日期:2021.6.18
carbopalladation/allylation with active methine compounds has been developed. Various indoles and isoquinolinones bearing a quaternary carbon center were achieved with good efficiency, a broad substrate scope and good functional group tolerance. This reaction underwent cascade oxidative addition, carbopalladation, and allylicalkylation, and two new C–C bonds were formed in one pot.
π-Allylpalladium intermediates are known to participate efficiently in transformations involving nucleophilic species. Exploring these processes, we have developed a method for the preparation of allyl acetates via palladium-catalysed functionalisation of allenes and 1,3-dienes. Reactions of aryl iodides with either of these two classes of compounds and excess sodium acetate in the presence of Pd(OAc)2
One-pot multi-step cascade protocols toward β-indolyl sulfoximidoyl amides <i>via</i> intermolecular trapping of an α-indolylpalladium complex by CO
作者:Huahua Liu、Li Wei、Zhiyuan Chen
DOI:10.1039/d1ob00128k
日期:——
were efficiently prepared from ortho-iodoanilines, propargyl bromides, 1 atm of CO, and substituted NH-sulfoximines, through a palladium-catalyzed indole annulation/carbonyl insertion/C–N bond formation cascade. Mostly good to high yields of the products were obtained through this multi-step, one-pot reaction protocol under very gentle reactionconditions. The obtained β-indolyl sulfoximidoyl amides could
通过钯催化的吲哚环化/羰基插入/C-N 键形成级联反应,由邻碘苯胺、炔丙基溴、1 atm CO 和取代的N H-亚砜亚胺有效地制备了各种 β-吲哚亚磺酰亚胺酰胺。在非常温和的反应条件下,通过这种多步骤、一锅法反应方案获得了大部分好到高产率的产物。获得的 β-吲哚亚磺酰亚胺酰胺可以转化为含有色胺部分的具有生物学意义的亚砜亚胺类似物。
An Approach to Cyclohepta[<i>b</i>]indoles through an Allenamide (4 + 3) Cycloaddition–Grignard Cyclization–Chugaev Elimination Sequence
作者:Shuzhong He、Richard P. Hsung、William R. Presser、Zhi-Xiong Ma、Bryan J. Haugen
DOI:10.1021/ol5006455
日期:2014.4.18
A strategy for synthesizing highly functionalized cyclohepta[b]indoles through a concise (4 + 3) cycloaddition–cyclization–elimination sequence is described. The cycloaddition features nitrogen-stabilized oxyallylcations derived from epoxidations of N-aryl-N-sulfonyl-substituted allenamides, while the cyclization and elimination employed an intramolecular Grignard addition and a one-step Chugaev process
A palladium-catalyzed enantioselective Heck cyclization/dearomatization cascade via capturing the cyclized Heck π-allylpalladium intermediate by β-naphthols is reported, which provides a new strategy for the construction of chiral indole–terpenoid frameworks. This method affords indole-functionalized β-naphthalenone compounds bearing an all-carbon-substituted quaternary chiral center in excellent yields