Article
Chemistry, Organic
Zachary A. Tolchin, Dallas M. Dukes, Leanna M. Gharbaoui, Joel M. Smith
Summary: A synthesis of the natural product thebaine from commercially available starting materials is described, which involves dearomatization and coupling reactions of simple aromatic compounds. This method allows for the production of two unnatural opioid derivatives, with the goal of developing synthetic opioid analogs of Naloxone. Furthermore, a catalytic asymmetric dearomatization using anion-pairing catalysis is proposed for the enantioselective synthesis of all reported targets.
Article
Chemistry, Organic
Yuanfeng Li, Hong-Yu Zhang, Yuecheng Zhang, Ya-Ping Han, Jiquan Zhao, Yong-Min Liang
Summary: A novel Pd-catalyzed asymmetric intra-molecular cascade cyclization has been developed for the synthesis of indoline derivatives through a dearomative Heck reaction, showing excellent yields and chiral selectivities.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Filip Djurkovic, Zorana Ferjancic, Filip Bihelovic
Summary: The synthetic route leading to the successful enantioselective total synthesis of (+)-alstonlarsine A, a monoterpenoid indole alkaloid, is discussed. The key step involved the assembly of a unique 9-azatricyclo[4.3.1.0(3,8)]decane core through an efficient domino sequence. The development of a new method for introducing the phosphonoacetate moiety into the indole C-2 position was also described, enabling the synthesis of analogues with different substituent patterns.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Zhen-Bang Chen, Ru-Xin Liu, Zi-Hao Li, Tong-Mei Ding, He-Yuan Bai, Zengming Shen, Shu-Yu Zhang
Summary: An efficient palladium-catalyzed enantioselective direct N-alkylation reaction using a novel axially chiral styrene-phosphine ligand SJTU-PHOS-1 was developed. The reaction showed good functional group compatibility and a wide range of substrate scope under mild conditions. Furthermore, DFT calculations revealed the coordination mode of the metal catalyst and the axially chiral styrene-phosphine ligand in enantioselectivity control.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Jewon Yang, Yohan Park, Sehun Yang, Geumwoo Lee, Min Woo Ha, Mi-hyun Kim, Suckchang Hong, Hyeung-geun Park
Summary: Optically active 2-azaspirocyclic structures are commonly found in biologically active natural products. A new enantioselective synthetic method was developed for chiral alpha-quaternary lactams, allowing for the successful total synthesis of Nitraria alkaloids such as (+)-nitramine, (+)-isonitramine, (-)-isonitramine, and (-)-sibirine.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Aaron L. Featherston, Yongseok Kwon, Matthew M. Pompeo, Oliver D. Engl, David K. Leahy, Scott J. Miller
Summary: This study introduces a novel method for controlling the stereochemistry of dinucleotide synthesis using chiral phosphoric acid catalysts, achieving control over the stereogenic phosphorous centers and unprecedented levels of diastereodivergence. The method utilizes two different CPA scaffolds to achieve stereodivergence and does not require stoichiometric activators or chiral auxiliaries, making it a convenient and efficient asymmetric catalysis method for the synthesis of diastereomeric dinucleotides and cyclic dinucleotides of interest in immuno-oncology.
Review
Chemistry, Multidisciplinary
Tauqir Ahmad, Sardaraz Khan, Nisar Ullah
Summary: Functionalized chiral indole derivatives are important organic structures encountered in pharmaceuticals and natural products, and the asymmetric Friedel-Crafts reaction is a powerful method for synthesizing diverse chiral indole derivatives. The discovery of chiral catalysts that can control enantiodiscrimination has gained significant attention in recent years.
Article
Chemistry, Multidisciplinary
Mateusz Dyguda, Artur Przydacz, Lukasz Albrecht
Summary: This manuscript describes the application of dearomative formal normal-electron-demand aza-Diels-Alder cycloaddition in the synthesis of tetrahydrofuropyridines. The developed approach utilizes aminocatalytic activation of 2-alkyl-3-furfurals that proceeds via formation of the dearomatized dienamine intermediate. The obtained cycloadducts can be further transformed into tetrahydrofuropyridines or functionalized cinnamates.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mateusz Dyguda, Artur Przydacz, Lukasz Albrecht
Summary: This manuscript describes the application of dearomative formal normal-electron-demand aza-Diels-Alder cycloaddition in the synthesis of tetrahydrofuropyridines. The method involves the aminocatalytic activation of 2-alkyl-3-furfurals and proceeds via the formation of dearomatized dienamine intermediate. The obtained cycloadducts can be further transformed into tetrahydrofuropyridines or functionalized cinnamates. The mechanism of the transformation was confirmed through DFT calculations.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Rongxing Zhang, Zhijie Wu, Shaoqian Yang, Dawei Ma
Summary: An asymmetric approach to install substituted imidazo[1,2-a]-indol-3-ones was reported in this study, which relied on a Pd/diamidophosphite-catalyzed intramolecular dearomative allylic substitution of 1,3-disubstituted indoles derived from 3-formylindoles and amino acids. Enantioselective total syntheses of (-)-spiroquinazoline and three related alkaloids were successfully achieved.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Review
Chemistry, Multidisciplinary
Guang-Jian Mei, Wai Lean Koay, Chuan Xiang Alvin Tan, Yixin Lu
Summary: Pyrroloindolines are important polycyclic indoline motifs widely found in natural products and bio-significant molecules, presenting a challenge to organic chemists with their rigid tricyclic molecular architectures and fully substituted carbon center at the C3a-position. Alkaloids containing pyrroloindoline display promising activities, making them significant in biological sciences and drug development. In recent decades, the synthetic targets of pyrroloindoline and analogues have attracted tremendous attention from the synthetic community, with a focus on catalytic asymmetric synthesis and total synthesis applications.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Organic
Pengyan Wang, Junhan Chen, Weigang He, Jiacheng Song, Hengqian Song, Hongbo Wei, Weiqing Xie
Summary: A concise asymmetric synthesis of (divided by)-isostrychnine is achieved through nine longest-linear steps with a 16% overall yield. Key features include catalytic asymmetric tandem double Michael addition, intramolecular dehydrative condensation/lactamization reaction, and allylic diazene rearrangement.
Article
Chemistry, Organic
Jian-Qiang Zhao, Shun Zhou, Zhen-Hua Wang, Yong You, Shuang Chen, Xiong-Li Liu, Ming-Qiang Zhou, Wei-Cheng Yuan
Summary: An organocatalytic asymmetric dearomative [4 + 2] annulation of 2-nitrobenzofurans and 5H-thiazol-4-ones was achieved for the first time, leading to the synthesis of polycyclic compounds with four contiguous stereocenters. The products showed impressive cytotoxicity against human cancer cell lines A549 and K562 according to preliminary biological evaluation.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Organic
Wen-Lin Zou, Yan-Qing Liu, Qing-Zhu Li, Xin-Xin Kou, Hua Huang, Rong-Sheng Tong, Jun-Long Li, Bo Han
Summary: In this study, an asymmetric dearomative tandem annulation between 3-nitroindoles and 7-oxo-5-heptenals was described. The cascade reactions proceeded smoothly using modularly designed organocatalysts self-assembled from cinchona-squaramide and d-proline. As a result, a collection of enantioenriched indoline-fused bicyclo[2.2.2]octanes featuring six vicinal stereocenters were smoothly obtained in good yields with excellent enantioselectivities (up to >99% ee). This protocol provides an economical and practical approach for the asymmetric synthesis of structurally complex indolines.
ORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Organic
Hualing He, Yang Cao, Jun Xu, Jon C. Antilla
Summary: A novel catalytic asymmetric C-7 Friedel-Crafts alkylation/N-hemiacetalization cascade reaction has been developed for the synthesis of functionalized 1,7-annulated indole scaffolds. The reaction, catalyzed by a chiral magnesium H8-BINOL-derived bis(phosphate) complex, provides high yields (up to 98%) and good to excellent enantioselectivities (up to 99%) and diastereoselectivities (up to >20:1) under mild conditions.
Article
Chemistry, Organic
Eric T. Sletten, Riley L. Svec, Hien M. Nguyen
TETRAHEDRON LETTERS
(2015)
Article
Chemistry, Multidisciplinary
Lucas W. Hernandez, Jola Pospech, Ulrich Klockner, Tanner W. Bingham, David Sarlah
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2017)
Article
Multidisciplinary Sciences
Michelle F. Richter, Bryon S. Drown, Andrew P. Riley, Alfredo Garcia, Tomohiro Shirai, Riley L. Svec, Paul J. Hergenrother
Article
Chemistry, Multidisciplinary
Lucas W. Hernandez, Ulrich Klockner, Jola Pospech, Lilian Hauss, David Sarlah
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2018)
Article
Biochemistry & Molecular Biology
Riley L. Svec, Lucia Furiassi, Christine G. Skibinski, Timothy M. Fan, Gregory J. Riggins, Paul J. Hergenrother
ACS CHEMICAL BIOLOGY
(2018)
Review
Chemistry, Multidisciplinary
Lucas W. Hernandez, David Sarlah
CHEMISTRY-A EUROPEAN JOURNAL
(2019)
Article
Chemistry, Multidisciplinary
Riley L. Svec, Paul J. Hergenrother
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Organic
Fei Na, Susana S. Lopez, Alice Beauseigneur, Lucas W. Hernandez, Zhuoxin Sun, Jon C. Antilla
Article
Chemistry, Organic
Lucas W. Hernandez, William P. Gallagher, Carlos A. Guerrero, Francisco Gonzalez-Bobes, John R. Coombs
Summary: The direct perfluoroalkylation of arenes with pendant benzylic electron-withdrawing groups can be facilitated under basic conditions using sodium dithionite with perfluoroalkyl iodides. This reaction occurs through the attack of the arene on the electrophilic perfluoroalkyl radical, with the donation of electron density from a benzylic anion, expanding the substrate scope beyond benzylic nitriles with cyclic substrates bearing electron-withdrawing groups.
JOURNAL OF ORGANIC CHEMISTRY
(2021)