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Bagheri M, Mohammadsaeed S, Gholamzadeh P. Annulation of the Ugi Products Using Palladium Catalysts. ChemistrySelect 2022. [DOI: 10.1002/slct.202104520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Maedeh Bagheri
- Department of Physics and Chemistry Alzahra University, Vanak Square Tehran Iran
| | - Shirin Mohammadsaeed
- Department of Physics and Chemistry Alzahra University, Vanak Square Tehran Iran
| | - Parisa Gholamzadeh
- Young Researchers and Elites Club Science and Research Branch Islamic Azad University Tehran Iran
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2
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Microwave-Assisted Post-Ugi Reactions for the Synthesis of Polycycles. Molecules 2022; 27:molecules27103105. [PMID: 35630582 PMCID: PMC9147490 DOI: 10.3390/molecules27103105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/10/2022] [Accepted: 05/10/2022] [Indexed: 12/04/2022] Open
Abstract
Microwave irradiation and post-Ugi reactions own their respective advantages in comparison with other strategies. The combination of microwave irradiation and post-Ugi reactions shows paramount importance in the construction of polycycles. This minireview outlines the recent developments of microwave-assisted post-Ugi reactions for the synthesis of polycycles. Through transition metal-catalyzed or transition metal-free transformations, diverse polycycles are prepared in an efficient, rapid, and step-economical manner.
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3
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Xu P, Qian B, Hu B, Huang H. Palladium-Catalyzed Tandem Hydrocarbonylative Lactamization and Cycloaddition Reaction for the Construction of Bridged Polycyclic Lactams. Org Lett 2021; 24:147-151. [PMID: 34928157 DOI: 10.1021/acs.orglett.1c03772] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intramolecular hydroaminocarbonylation of alkenes is a compelling tool to rapidly access lactam, a privileged motif ubiquitous in natural products, pharmaceuticals, and agrochemicals. However, selective carbonylation to bridged polycyclic lactams with a lactam nitrogen at a bridgehead position is less explored. We herein report a modular palladium-catalyzed approach to perform a tandem hydrocarbonylative lactamization/Diels-Alder cycloaddition reaction with 2-vinyl aryl aldimines, alkenes, and CO, which offers convenient access to furnish the bridged polycyclic lactams in high yields with high selectivities.
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Affiliation(s)
- Pengcheng Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Bo Qian
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Bin Hu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Hanmin Huang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China.,Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, Center for Excellence in Molecular Synthesis, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, P. R. China
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4
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Sun Q, Lu X, Tantillo DJ. Dynamic Effects in Intramolecular Schmidt Reactions: Entropy, Electrostatic Drag, and Selectivity Prediction. Chemphyschem 2021; 22:649-656. [PMID: 33567140 DOI: 10.1002/cphc.202100033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Indexed: 12/16/2022]
Abstract
Electrostatic drag in the intramolecular Schmidt reactions of azidopropylcyclohexanones is characterized using density functional theory (DFT) calculations and direct dynamics simulations. Despite resulting from enthalpically favorable interactions, electrostatic drag slows down N2 loss during formation of bridged lactam products, an effect with implications for controlling product selectivity.
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Affiliation(s)
- Qing Sun
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, China
| | - Xin Lu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Dean J Tantillo
- Department of Chemistry, University of California, Davis, CA 95616, USA
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5
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Pharande SG. The Merger of Isocyanide‐Based Multicomponent Reaction and Ring‐Closing Metathesis (IMCR/RCM). ChemistrySelect 2021. [DOI: 10.1002/slct.202004131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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6
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Jassem AM, Dhumad AM, Almashal FAK. Synthesis of New Drug-Like Piperazine-2,5-diones by the Ugi/Tandem Process Catalyzed by TMSOTf and Their Molecular Docking. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220110262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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7
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Golmohammadi F, Balalaie S, Fathi Vavsari V, Anwar MU, Al-Harrasi A. Synthesis of Spiro-β-lactam-pyrroloquinolines as Fused Heterocyclic Scaffolds through Post-transformation Reactions. J Org Chem 2020; 85:13141-13152. [PMID: 32988202 DOI: 10.1021/acs.joc.0c01817] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A sequential post-transformation of Ugi four-component reaction/nucleophilic substitution was developed for the synthesis of spiro-β-lactam-pyrroloquinolines. This method involves the Ugi-4CR of 2-chloro-3-formyl quinolines 1a-h, amines 2a-d, 2-chloroacetic acid 3, and isocyanides 4a, 4b for the synthesis of versatile precursors 5a-v. The Ugi adducts were intramolecularly cyclized under basic conditions through the sequential nucleophilic aromatic substitution (SNAr)/second-order nucleophilic substitution (SN2) reaction to give spiro-β-lactam-pyrroloquinoline scaffolds 6a-t. This approach is an efficient method for the synthesis of fused bioactive heterocyclic backbones containing quinoline, pyrrolidone, and β-lactam with high bond-forming efficiency.
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Affiliation(s)
- Farhad Golmohammadi
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran, Iran
| | - Saeed Balalaie
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran, Iran.,Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Vaezeh Fathi Vavsari
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran, Iran
| | - Muhammad U Anwar
- Natural and Medical Sciences Research Center, University of Nizwa, P.O. Box 33, Birkat Al Mauz, 616 Nizwa, Sultanate of Oman
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center, University of Nizwa, P.O. Box 33, Birkat Al Mauz, 616 Nizwa, Sultanate of Oman
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8
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Abstract
AbstractLactams are very important heterocycles as a result of their presence in a wide range of bioactive molecules, natural products and drugs, and also due their utility as versatile synthetic intermediates. Due to these reasons, numerous efforts have focused on the development of effective and efficient methods for their synthesis. Compared to conventional two-component reactions, multicomponent reactions (MCRs), particularly isocyanide-based MCRs, are widely used for the synthesis of a range of small heterocycles including lactam analogues. Despite their numerous applications in almost every field of chemistry, as yet there is no dedicated review on isocyanide-based multicomponent reactions (IMCRs) concerning the synthesis of lactams. Therefore, this review presents strategies towards the synthesis of α-, β-, γ-, δ- and ε-lactams using IMCRs or IMCRs/post-transformation reactions reported in the literature between 2000 and 2020.1 Introduction2 Developments in Lactam Synthesis2.1 α-Lactams2.2 β-Lactams2.3 γ-Lactams2.3.1 General γ-Lactams2.3.2 Benzo-Fused γ-Lactams2.3.3 Spiro γ-Lactams2.3.4 α,β-Unsaturated γ-Lactams2.3.5 Polycyclic Fused γ-Lactams2.4 δ-Lactams2.5 ε-Lactams3 Conclusions
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9
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Ugi–Smiles and Ullmann reactions catalyzed by Schiff base derived from Tröger’s base and BINOL. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04091-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Zidan A, El-Naggar AM, Abd El-Sattar NEA, Ali AK, El Kaïm L. Raising the Diversity of Ugi Reactions Through Selective Alkylations and Allylations of Ugi Adducts. Front Chem 2019; 7:20. [PMID: 30761290 PMCID: PMC6361783 DOI: 10.3389/fchem.2019.00020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 01/10/2019] [Indexed: 11/23/2022] Open
Abstract
We report here selective Tsuji-Trost type allylation of Ugi adducts using a strategy based on the enhanced nucleophilicity of amide dianions. Ugi adducts derived from aromatic aldehydes were easily allylated at their peptidyl position with allyl acetate in the presence of palladium catalysts. These substitutions were compared to more classical transition metal free allylations using allyl bromides.
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Affiliation(s)
- Alaa Zidan
- Laboratoire de Synthèse Organique, CNRS, Ecole Polytechnique, ENSTA ParisTech, UMR 7652, Université Paris-Saclay, Palaiseau, France.,Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Abeer M El-Naggar
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | | | - Ali Khalil Ali
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Laurent El Kaïm
- Laboratoire de Synthèse Organique, CNRS, Ecole Polytechnique, ENSTA ParisTech, UMR 7652, Université Paris-Saclay, Palaiseau, France
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11
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Xu ZG, Li SQ, Meng JP, Tang DY, He LJ, Lei J, Lin HK, Li HY, Chen ZZ. Functionalized Spiroindolines with Anticancer Activity through a Metal-Free Post-Ugi Diastereoselective One-Pot Cascade Reaction. Chemistry 2018; 24:6732-6736. [PMID: 29676029 PMCID: PMC6042644 DOI: 10.1002/chem.201801081] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Indexed: 11/06/2022]
Abstract
A post-Ugi diastereoselective one-pot cascade reaction requiring no metal catalyst was developed. The reaction scope was wide with mild conditions and good yields. A collection of spiroindolines was prepared by the protocol and screening tests in several difficult-to-inhibit cancer cell lines were conducted. The relationship of structure and anticancer activities was promising and in the Huh7 cell lines compound 16 j is more potent than Vinbalstine. The cyclization design strategy could be applicable to other multicomponent reactions (MCRs) for synthesizing bioactive and drug-like heterocycles.
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Affiliation(s)
- Zhi-Gang Xu
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Shi-Qiang Li
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Jiang-Ping Meng
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Dian-Yong Tang
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Liu-Jun He
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Jie Lei
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
| | - Hui-Kuan Lin
- Department of Cancer Biology, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, 27157, USA
| | - Hong-Yu Li
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Zhong-Zhu Chen
- Chongqing Engineering Laboratory of, Targeted and Innovative Therapeutics, Chongqing Key Laboratory of Kinase Modulators as, Innovative Medicine, IATTI, Chongqing University of Arts and Sciences, No. 319 Honghe Ave., Yongchuan, Chongqing, 402160, P.R. China
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12
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Ziyaei Halimehjani A, Sharifi M. Synthesis of a novel category of Ugi adducts using succinic acid, succinic anhydride and maleic anhydride and their application in post-Ugi reactions for synthesis of functionalized piperazine 2,5-diones. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.08.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Balalaie S, Shamakli M, Nikbakht A, Alavijeh NS, Rominger F, Rostamizadeh S, Bijanzadeh HR. Direct access to isoxazolino and isoxazolo benzazepines from 2-((hydroxyimino)methyl)benzoic acid via a post-Ugi heteroannulation. Org Biomol Chem 2017; 15:5737-5742. [PMID: 28654111 DOI: 10.1039/c7ob01142c] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A diversity-oriented access to isoxazolino and isoxazolo benzazepines is elaborated via a post-Ugi heteroannulation involving intramolecular 1,3-dipolar cycloaddition reaction of nitrile oxides with alkenes and alkynes. This sequence offers an interesting multicomponent entry to a library of isoxazolino and isoxazolo benzazepines under mild reaction conditions in good to excellent yields.
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Affiliation(s)
- Saeed Balalaie
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran. and Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Shamakli
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Ali Nikbakht
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Nahid S Alavijeh
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Frank Rominger
- Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Shahnaz Rostamizadeh
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
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14
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Parella R, Babu SA. Pd(II)-Catalyzed, Picolinamide-Assisted, Z-Selective γ-Arylation of Allylamines To Construct Z-Cinnamylamines. J Org Chem 2017; 82:6550-6567. [DOI: 10.1021/acs.joc.7b00535] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ramarao Parella
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli P.O., Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
| | - Srinivasarao Arulananda Babu
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli P.O., Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
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15
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Liu C, Szostak M. Twisted Amides: From Obscurity to Broadly Useful Transition-Metal-Catalyzed Reactions by N−C Amide Bond Activation. Chemistry 2017; 23:7157-7173. [DOI: 10.1002/chem.201605012] [Citation(s) in RCA: 246] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Indexed: 02/05/2023]
Affiliation(s)
- Chengwei Liu
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Michal Szostak
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
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16
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Hu F, Lalancette R, Szostak M. Structural Characterization of N-Alkylated Twisted Amides: Consequences for Amide Bond Resonance and N−C Cleavage. Angew Chem Int Ed Engl 2016; 55:5062-6. [DOI: 10.1002/anie.201600919] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Feng Hu
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Roger Lalancette
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Michal Szostak
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
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17
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Hu F, Lalancette R, Szostak M. Structural Characterization of N-Alkylated Twisted Amides: Consequences for Amide Bond Resonance and N−C Cleavage. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600919] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Feng Hu
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Roger Lalancette
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
| | - Michal Szostak
- Department of Chemistry; Rutgers University; 73 Warren Street Newark NJ 07102 USA
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18
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Liu Y, Meng G, Liu R, Szostak M. Sterically-controlled intermolecular Friedel–Crafts acylation with twisted amides via selective N–C cleavage under mild conditions. Chem Commun (Camb) 2016; 52:6841-4. [DOI: 10.1039/c6cc02324j] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly chemoselective Friedel–Crafts acylation of arenes with twisted amides by N–C bond cleavage is reported for the first time.
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Affiliation(s)
- Yongmei Liu
- Department of Chemistry
- Rutgers University
- Newark
- USA
- College of Chemistry and Chemical Engineering
| | | | - Ruzhang Liu
- College of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
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19
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Szostak R, Aubé J, Szostak M. An efficient computational model to predict protonation at the amide nitrogen and reactivity along the C-N rotational pathway. Chem Commun (Camb) 2015; 51:6395-8. [PMID: 25766378 DOI: 10.1039/c5cc01034a] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Protonation of amides is critical in numerous biological processes, including amide bonds proteolysis and protein folding as well as in organic synthesis as a method to activate amide bonds towards unconventional reactivity. A computational model enabling prediction of protonation at the amide bond nitrogen atom along the C-N rotational pathway is reported. Notably, this study provides a blueprint for the rational design and application of amides with a controlled degree of rotation in synthetic chemistry and biology.
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Affiliation(s)
- Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
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Szostak R, Aubé J, Szostak M. Determination of Structures and Energetics of Small- and Medium-Sized One-Carbon-Bridged Twisted Amides using ab Initio Molecular Orbital Methods: Implications for Amidic Resonance along the C–N Rotational Pathway. J Org Chem 2015; 80:7905-27. [DOI: 10.1021/acs.joc.5b00881] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Jeffrey Aubé
- Division of Chemical
Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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Barlow TMA, Jida M, Tourwé D, Ballet S. Efficient synthesis of conformationally constrained, amino-triazoloazepinone-containing di- and tripeptides via a one-pot Ugi-Huisgen tandem reaction. Org Biomol Chem 2015; 12:6986-9. [PMID: 25116189 DOI: 10.1039/c4ob01381f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Herein we describe a catalyst-free procedure employing an Ugi-4CR between a β-azido-α-amino acid, propargylamine, an isocyanide and an aldehyde, followed by a thermal azide-alkyne Huisgen cycloaddition to generate a 16-member library of amino-triazoloazepinone-bearing di- and tripeptides with up to four points of diversification and high atom economy.
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Affiliation(s)
- T M A Barlow
- Research Group of Organic Chemistry, Departments of Chemistry and Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium.
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23
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Sharma UK, Sharma N, Vachhani DD, Van der Eycken EV. Metal-mediated post-Ugi transformations for the construction of diverse heterocyclic scaffolds. Chem Soc Rev 2015; 44:1836-60. [PMID: 25652577 DOI: 10.1039/c4cs00253a] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The Ugi-4CR is by far one of the most successful multicomponent reactions leading to high structural diversity and molecular complexity. However, the reaction mostly affords a linear peptide backbone, enabling post-Ugi transformations as the only solution to rigidify the Ugi-adduct into more drug like species. Not surprisingly, the development of these transformations, leading to new structural frameworks, has expanded rapidly over the last few years. As expected, palladium-catalyzed reactions have received the foremost attention, yet other metals, particularly gold complexes, are fast catching up. This tutorial review outlines the developments achieved in the past decade, highlighting the modifications that are performed in a sequential or domino fashion with emphasis on major concepts, synthetic applications of the derived products as well as mechanistic aspects.
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Affiliation(s)
- Upendra K Sharma
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001, Leuven, Belgium.
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24
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Facile synthesis of functionalized 1H-pyrrolo[2,3-b]quinolines via Ugi four-component reaction followed by Cu-catalyzed aryl-amide, C–N bond coupling. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.140] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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25
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Moni L, Denissen M, Valentini G, Müller TJJ, Riva R. Diversity-oriented synthesis of intensively blue emissive 3-hydroxyisoquinolines by sequential Ugi four-component reaction/reductive Heck cyclization. Chemistry 2014; 21:753-62. [PMID: 25369792 DOI: 10.1002/chem.201404209] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 11/09/2022]
Abstract
A convergent approach to highly functionalized 3-hydroxyisoquinolines is reported. The key steps are an Ugi multicomponent reaction and a subsequent intramolecular reductive Heck reaction; these can also be performed as a one-pot procedure. The structures display very interesting properties as blue-fluorescence emitters. Photophysical studies on the absorption and static fluorescence indicate that the substitution pattern on the pyridyl part influences the optical properties only to a minor extent, unless the amide substituent becomes sterically demanding and leads to significant nonradiative deactivation. The donor substitution on the benzo core considerably enhances the fluorescence quantum yields and trimethoxy substitution causes a pronounced redshift of the emission bands. Protonation of the isoquinolyl nitrogen atom causes efficient static quenching of the fluorescence.
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Affiliation(s)
- Lisa Moni
- Dipartimento di Chimica e Chimica Industriale, University of Genova, Via Dodecaneso 31, 16146 Genova (Italy)
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26
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Sahn JJ, Granger BA, Martin SF. Evolution of a strategy for preparing bioactive small molecules by sequential multicomponent assembly processes, cyclizations, and diversification. Org Biomol Chem 2014; 12:7659-72. [PMID: 25135846 PMCID: PMC4167917 DOI: 10.1039/c4ob00835a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A strategy for generating diverse collections of small molecules has been developed that features a multicomponent assembly process (MCAP) to efficiently construct a variety of intermediates possessing an aryl aminomethyl subunit. These key compounds are then transformed via selective ring-forming reactions into heterocyclic scaffolds, each of which possesses suitable functional handles for further derivatizations and palladium-catalyzed cross coupling reactions. The modular nature of this approach enables the facile construction of libraries of polycyclic compounds bearing a broad range of substituents and substitution patterns for biological evaluation. Screening of several compound libraries thus produced has revealed a large subset of compounds that exhibit a broad spectrum of medicinally-relevant activities.
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Affiliation(s)
- James J Sahn
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712-0165, USA.
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27
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Densely functionalized 1,2-dihydrobenzo[b][1,6]naphthyridines: one-pot synthesis via sequential Ugi and Heck reactions. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.08.046] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Huang Y, Wolf S, Beck B, Köhler LM, Khoury K, Popowicz GM, Goda SK, Subklewe M, Twarda A, Holak TA, Dömling A. Discovery of highly potent p53-MDM2 antagonists and structural basis for anti-acute myeloid leukemia activities. ACS Chem Biol 2014; 9:802-11. [PMID: 24405416 PMCID: PMC3985958 DOI: 10.1021/cb400728e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The inhibition of p53-MDM2 interaction
is a promising new approach
to non-genotoxic cancer treatment. A potential application for drugs
blocking the p53-MDM2 interaction is acute myeloid leukemia (AML)
due to the occurrence of wild type p53 (wt p53) in the majority of
patients. Although there are very promising preclinical results of
several p53-MDM2 antagonists in early development, none of the compounds
have yet proven the utility as a next generation anticancer agent.
Herein we report the design, synthesis and optimization of YH239-EE
(ethyl ester of the free carboxylic acid compound YH239), a potent
p53-MDM2 antagonizing and apoptosis-inducing agent characterized by
a number of leukemia cell lines as well as patient-derived AML blast
samples. The structural basis of the interaction between MDM2 (the
p53 receptor) and YH239 is elucidated by a co-crystal structure. YH239-EE
acts as a prodrug and is the most potent compound that induces apoptosis
in AML cells and patient samples. The observed superior activity compared
to reference compounds provides the preclinical basis for further
investigation and progression of YH239-EE.
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Affiliation(s)
- Yijun Huang
- Department
of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, Pennsylvania 15261, United States
| | - Siglinde Wolf
- Max Plank Institute for Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Barbara Beck
- Clinical Cooperation
Group Immunotherapy, Helmholtz Zentrum München, Marchioninistrasse 25, 81377 München, Germany
- Department
of Internal Medicine III, University of Munich, Campus Großhadern,
Marchininistrasse 15, 81377 München, Germany
| | - Lisa-Maria Köhler
- Clinical Cooperation
Group Immunotherapy, Helmholtz Zentrum München, Marchioninistrasse 25, 81377 München, Germany
| | - Kareem Khoury
- Department
of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, Pennsylvania 15261, United States
| | - Grzegorz M. Popowicz
- Max Plank Institute for Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Sayed K Goda
- Protein
Engineering Unit, Anti-Doping Laboratory-Qatar, Doha, Qatar
| | - Marion Subklewe
- Clinical Cooperation
Group Immunotherapy, Helmholtz Zentrum München, Marchioninistrasse 25, 81377 München, Germany
- Department
of Internal Medicine III, University of Munich, Campus Großhadern,
Marchininistrasse 15, 81377 München, Germany
| | - Aleksandra Twarda
- Faculty
of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland
| | - Tad A. Holak
- Max Plank Institute for Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
- Faculty
of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland
| | - Alexander Dömling
- Department
of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, Pennsylvania 15261, United States
- Department
for Drug Design, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
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29
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Neochoritis CG, Dömling A. Towards a facile and convenient synthesis of highly functionalized indole derivatives based on multi-component reactions. Org Biomol Chem 2014; 12:1649-51. [PMID: 24477767 PMCID: PMC4015188 DOI: 10.1039/c4ob00166d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A library of potentially bioactive compounds through the novel 1H-indole-methyl-isocyanide and MCRs has been described. A flexible and efficient synthesis affording great complexity and diversity is achieved with moderate to good yields with no need for protection and deprotection steps.
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Affiliation(s)
- Constantinos G Neochoritis
- Department of Drug Design, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
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30
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Satyanarayana G, Helmchen G. Enantioselective Syntheses of Bicyclic Lactams Based on Iridium-Catalyzed Asymmetric Allylic Substitution and Heck Cyclization. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301813] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Pandey S, Kumar SV, Kant R, Chauhan PMS. Base mediated 7-exo-dig intramolecular cyclization of Ugi–propargyl precursors: a highly efficient and regioselective synthetic approach toward diverse 1,4-benzoxazepine-5(2H)-ones. Org Biomol Chem 2014; 12:5346-50. [DOI: 10.1039/c4ob00793j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A metal-free facile and efficient two-step synthetic protocol for the preparation of 1,4-benzoxazepine-5(2H)-one derivatives has been developed.
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Affiliation(s)
- Shashi Pandey
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Sector 10
- Lucknow 226031, India
| | - S. Vinod Kumar
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Sector 10
- Lucknow 226031, India
| | - Ruchir Kant
- Molecular and Structural Biology Division
- CSIR-Central Drug Research Institute
- Sector 10
- Lucknow 226031, India
| | - Prem M. S. Chauhan
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Sector 10
- Lucknow 226031, India
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32
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Jida M, Tourwé D, Ballet S. Highly stereoselective one-pot construction of trisubstituted tetrahydro-β-carboline-fused diketopiperazines: a synthetic route towards cialis analogues. RSC Adv 2014. [DOI: 10.1039/c4ra05981f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile and efficient synthetic method for the stereoselective preparation of trisubstituted tetrahydro-β-carboline-fused diketopiperazine derivatives is reported.
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Affiliation(s)
- Mouhamad Jida
- Research Group of Organic Chemistry
- Departments of Chemistry and Bio-engineering Sciences
- Vrije Universiteit Brussel
- B-1050 Brussels, Belgium
| | - Dirk Tourwé
- Research Group of Organic Chemistry
- Departments of Chemistry and Bio-engineering Sciences
- Vrije Universiteit Brussel
- B-1050 Brussels, Belgium
| | - Steven Ballet
- Research Group of Organic Chemistry
- Departments of Chemistry and Bio-engineering Sciences
- Vrije Universiteit Brussel
- B-1050 Brussels, Belgium
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33
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Wang W, Zheng Z, Wang X, Chen J. Generation and Conjugate Additions ofo-Quinone Methides Under Mild Base Conditions: Rapid Synthesis ofN-Substituted Aryl Glycine Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Affiliation(s)
- Michal Szostak
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
| | - Jeffrey Aubé
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
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35
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Construction of functionalized tricyclic dihydropyrazino-quinazolinedione chemotypes via an Ugi/ N-acyliminium ion cyclization cascade. Tetrahedron Lett 2013; 54:4467-4470. [PMID: 23997316 DOI: 10.1016/j.tetlet.2013.06.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Dihydropyrazino-quinazolinedione chemotypes are complex and structurally challenging structures of biological interest, being found in the marine alkaloids such as brevianamide M-N and fumiquinazolines A-C. Herein we report the synthesis of this tricyclic system in three synthetic operations by means of an Ugi multi-component reaction (MCR) followed by a tandem N-acyliminium ion cyclization-intramolecular nucleophilic addition reaction sequence. Additional structural diversification for further library enrichment was also accomplished via sequential N-alkylation and N-acylation/sulfonation.
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36
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Raikar SN, Malinakova HC. Divergent reaction pathways of homologous and isosteric propargyl amides in sequential Ru/Pd-catalyzed annulations for the synthesis of heterocycles. J Org Chem 2013; 78:3832-46. [PMID: 23521584 DOI: 10.1021/jo400246d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cu-catalyzed three-component coupling of imines with benzoyl chloride and terminal arylalkynes followed by enyne ring-closing metathesis (RCM) and Heck cyclization afforded medicinally relevant benzoindolines, cyclopropane-fused indenopyridines, pyrroloquinolines, or 1,7-tetrahydrophenanthrolines via divergent cyclization pathways. Unexpectedly, the Pd-catalyzed cyclization of heterocyclic dienes proceeded via regiodivergent 5-exo or 6-endo pathways depending on the ring size (n = 1, 2) or the presence of isosteric groups (CH vs N). A one-pot protocol for the enyne-RCM/Heck annulation featuring a sequential addition of the Ru and Pd catalysts was developed maximizing the synthetic efficiency.
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Affiliation(s)
- Sandeep N Raikar
- Department of Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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37
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Bennasar ML, Solé D, Zulaica E, Alonso S. Synthesis of cleavamine-type indole alkaloids and their 5-nor derivatives by a ring-closing metathesis–vinyl halide Heck cyclization strategy. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.01.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Leikoski T, Wrigstedt P, Helminen J, Matikainen J, Sipilä J, Yli-Kauhaluoma J. The Heck reaction of polymer-supported allylamine with aryl iodides. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.10.092] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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39
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Pandey S, Khan S, Singh A, Gauniyal HM, Kumar B, Chauhan PMS. Access to Indole- And Pyrrole-Fused Diketopiperazines via Tandem Ugi-4CR/Intramolecular Cyclization and Its Regioselective Ring-Opening by Intermolecular Transamidation. J Org Chem 2012; 77:10211-27. [DOI: 10.1021/jo3018704] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Shashi Pandey
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
| | - Shahnawaz Khan
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
| | - Awantika Singh
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
| | - Harsh M. Gauniyal
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
| | - Brijesh Kumar
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
| | - Prem M. S. Chauhan
- Medicinal
and Process Chemistry Division, ‡Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute, Lucknow, 226 001, India
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40
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Xu Z, De Moliner F, Cappelli AP, Hulme C. Ugi/aldol sequence: expeditious entry to several families of densely substituted nitrogen heterocycles. Angew Chem Int Ed Engl 2012; 51:8037-40. [PMID: 22753341 DOI: 10.1002/anie.201202575] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Indexed: 11/08/2022]
Affiliation(s)
- Zhigang Xu
- BIO5 Oro Valley, Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, 1580 E. Hanley Blvd, Oro Valley, AZ 85737, USA
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41
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Xu Z, De Moliner F, Cappelli AP, Hulme C. Ugi/Aldol Sequence: Expeditious Entry to Several Families of Densely Substituted Nitrogen Heterocycles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202575] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Glover SA, Rosser AA. Reliable Determination of Amidicity in Acyclic Amides and Lactams. J Org Chem 2012; 77:5492-502. [DOI: 10.1021/jo300347k] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Stephen A. Glover
- Department of Chemistry, School of
Science and Technology, University of New England, Armidale, NSW 2351, Australia
| | - Adam A. Rosser
- Department of Chemistry, School of
Science and Technology, University of New England, Armidale, NSW 2351, Australia
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43
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Affiliation(s)
- Alexander Dömling
- Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
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44
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Sequential ring-closing metathesis–vinyl halide Heck cyclization reactions: access to the tetracyclic ring system of ervitsine. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.04.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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45
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Welsch SJ, Kalinski C, Umkehrer M, Ross G, Kolb J, Burdack C, Wessjohann LA. Palladium and copper catalyzed cyclizations of hydrazine derived Ugi products: facile synthesis of substituted indazolones and hydroxytriazafluorendiones. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.095] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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46
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Sañudo M, García-Valverde M, Marcaccini S, Torroba T. A diastereoselective synthesis of pseudopeptidic hydantoins by an Ugi/cyclization/Ugi sequence. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.073] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Merino P, Tejero T, Greco G, Marca E, Delso I, Gómez-SanJuan A, Matute R. Recent Advances on the Synthesis of Piperidines through Ruthenium-Catalyzed Ring-Closing Metathesis (RCM) Reactions. HETEROCYCLES 2012. [DOI: 10.3987/rev-11-sr(p)1] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Gutierrez O, Aubé J, Tantillo DJ. Mechanism of the Acid-Promoted Intramolecular Schmidt Reaction: Theoretical Assessment of the Importance of Lone Pair–Cation, Cation−π, and Steric Effects in Controlling Regioselectivity. J Org Chem 2011; 77:640-7. [DOI: 10.1021/jo202338m] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Osvaldo Gutierrez
- Department of Chemistry, University of California at Davis, Davis, California
95616, United States
| | - Jeffrey Aubé
- Department
of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045, United
States
| | - Dean J. Tantillo
- Department of Chemistry, University of California at Davis, Davis, California
95616, United States
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49
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50
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Islas-Jácome A, González-Zamora E, Gámez-Montaño R. A short microwave-assisted synthesis of tetrahydroisoquinolin-pyrrolopyridinones by a triple process: Ugi-3CR–aza Diels–Alder/S-oxidation/Pummerer. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.07.134] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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