The Z-enoate assisted, Meyer–Schuster rearrangement cascade: unconventional synthesis of α-arylenone esters
作者:Prabhakararao Tharra、Beeraiah Baire
DOI:10.1039/c6cc06639a
日期:——
Bronstead acid promoted nucleophilation of proaprgylic aclohols during Meyer-Schuster rearrangement (M-S) has been introduced. A novel convept of reverse polarization of the M-S intermediate allenyl cation has been realized by...
Facile synthesis of 2-arylmethylindoles and 2-vinylic indoles through palladium-catalyzed heteroannulations of 2-(2-propynyl)aniline and 2-(2-propynyl)tosylanilide
作者:Bimolendu Das、Priyanka Kundu、Chinmay Chowdhury
DOI:10.1039/c3ob41961d
日期:——
A facile method for the general synthesis of 2-arylmethylindoles has been developed through the reaction of 2-(2-propynyl)aniline or 2-(2-propynyl)tosylanilide with aryl iodides in the presence of Pd(OAc)2, PPh3, and DBU. 2-(2-Propynyl)tosylanilide is found to be reactive also towards electron deficient alkenes in the presence of Pd(OAc)2 and sodium iodide under an oxygen atmosphere, providing easy access to 2-vinylic indoles which possess exclusive E-stereochemistry in the side chain double bond. Operational simplicity, compatibility of the various functional groups, and ease of product formation are the hallmarks of these methods. A mechanism has been proposed to explain the product formation.
Palladium-catalyzed intramolecular aminoiodination of alkenes using molecular oxygen as oxidant
作者:Lu Chen、Xianglin Luo、Yibiao Li
DOI:10.1007/s00706-016-1819-2
日期:2017.5
AbstractMolecular oxygen as oxidant to promote palladium-catalyzedintramolecular aminoiodination of alkenes has been described. The yields are excellent and show high exo-selectivities with various substrates. Graphical abstract
Synthesis of Benzofuran and Indole Derivatives Catalyzed by Palladium on Carbon
作者:Anatoli Savvidou、Dimitrios IoannisTzaras、Giorgos S. Koutoulogenis、Alexis Theodorou、Christoforos G. Kokotos
DOI:10.1002/ejoc.201900577
日期:2019.6.30
A cheap, easy‐to‐execute and sustainable synthetic methodology for the synthesis of indoles and benzofurans was developed utilizing Pd/C as the promoter. A great variety of substituted ortho‐allyl anilines or phenols were utilized, leading to products in moderate yields. Recycling of the catalyst up to five times has been achieved.
Synthesis of Functionalized Indoles via Palladium-Catalyzed Aerobic Cycloisomerization of <i>o</i>-Allylanilines Using Organic Redox Cocatalyst
作者:Xiao-Shan Ning、Mei-Mei Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.joc.8b01999
日期:2018.11.2
A scalable and practical synthesis of functionalized indoles via Pd-tBuONO cocatalyzed aerobic cycloisomerization of o-allylanilines is reported. Using molecular oxygen as a terminal oxidant, a series of substituted indoles were prepared in moderate to good yields. The avoidance of hazardous oxidants, heavy-metal cocatalysts, and high boiling point solvents such as DMF and DMSO enables this method
报道了通过Pd- t BuONO共催化邻烯丙基苯胺的好氧环异构化可规模化和实用地合成官能化的吲哚。使用分子氧作为末端氧化剂,以中等至良好的产率制备了一系列取代的吲哚。避免使用有害的氧化剂,重金属助催化剂和高沸点溶剂(例如DMF和DMSO),可使该方法应用于药物合成。吲哚美辛的实用克级合成证明了其应用潜力。