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Ghosh A, Mane MV, Rode HB, Patil SA, Sridhar B, Dateer RB. Catalyst-Free Regioselective [3+2] Cycloadditions of α,β-unsaturated N-arylnitrones with Alkenes to Access Functionalized Isoxazolidines: A DFT Study. Chem Asian J 2020; 15:899-903. [PMID: 32056350 DOI: 10.1002/asia.201901754] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/10/2020] [Indexed: 01/20/2023]
Abstract
The catalyst-free regioselective [3+2]-cycloaddition of α,β-unsaturated N-arylnitrones with alkenes are developed. The series of synthetically important functionalized isoxazolidines are prepared in good to excellent yields by step economic pathway under ligand and transition-metal-free conditions. The regioselective cycloaddition pathway supported by control experiment and computational study.
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Affiliation(s)
- Arnab Ghosh
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka, 562112, India
| | - Manoj V Mane
- Physical Chemistry Division, CSIR - National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411 008, India.,KAUST Catalysis Centre, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Haridas B Rode
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad, Telangana, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Siddappa A Patil
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka, 562112, India
| | - Balasubramanian Sridhar
- Center for X-ray crystallography Analytical Department, CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad, Telangana, 500007, India
| | - Ramesh B Dateer
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka, 562112, India
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2
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Maskeri MA, O'Connor MJ, Jaworski AA, Bay AV, Scheidt KA. A Cooperative Hydrogen Bond Donor–Brønsted Acid System for the Enantioselective Synthesis of Tetrahydropyrans. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811383] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Mark A. Maskeri
- Department of Chemistry Center for Molecular Innovation and Drug Discovery Northwestern University Silverman Hall Evanston IL 60208 USA
| | - Matthew J. O'Connor
- Department of Chemistry Center for Molecular Innovation and Drug Discovery Northwestern University Silverman Hall Evanston IL 60208 USA
| | - Ashley A. Jaworski
- Department of Chemistry Center for Molecular Innovation and Drug Discovery Northwestern University Silverman Hall Evanston IL 60208 USA
| | - Anna V. Bay
- Department of Chemistry Center for Molecular Innovation and Drug Discovery Northwestern University Silverman Hall Evanston IL 60208 USA
| | - Karl A. Scheidt
- Department of Chemistry Center for Molecular Innovation and Drug Discovery Northwestern University Silverman Hall Evanston IL 60208 USA
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3
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Maskeri MA, O'Connor MJ, Jaworski AA, Bay AV, Scheidt KA. A Cooperative Hydrogen Bond Donor-Brønsted Acid System for the Enantioselective Synthesis of Tetrahydropyrans. Angew Chem Int Ed Engl 2018; 57:17225-17229. [PMID: 30380196 DOI: 10.1002/anie.201811383] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 10/26/2018] [Indexed: 11/07/2022]
Abstract
Carbocations stabilized by adjacent oxygen atoms are useful reactive intermediates involved in fundamental chemical transformations. These oxocarbenium ions typically lack sufficient electron density to engage established chiral Brønsted or Lewis acid catalysts, presenting a major challenge to their widespread application in asymmetric catalysis. Leading methods for selectivity operate primarily through electrostatic pairing between the oxocarbenium ion and a chiral counterion. A general approach to new enantioselective transformations of oxocarbenium ions requires novel strategies that address the weak binding capabilities of these intermediates. We demonstrate herein a novel cooperative catalysis system for selective reactions with oxocarbenium ions. This new strategy has been applied to a highly selective and rapid oxa-Pictet-Spengler reaction and highlights a powerful combination of an achiral hydrogen bond donor with a chiral Brønsted acid.
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Affiliation(s)
- Mark A Maskeri
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Silverman Hall, Evanston, IL, 60208, USA
| | - Matthew J O'Connor
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Silverman Hall, Evanston, IL, 60208, USA
| | - Ashley A Jaworski
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Silverman Hall, Evanston, IL, 60208, USA
| | - Anna V Bay
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Silverman Hall, Evanston, IL, 60208, USA
| | - Karl A Scheidt
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Silverman Hall, Evanston, IL, 60208, USA
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4
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Eitzinger A, Zielke K, Widhalm M, Robiette R, Waser M. Syntheses of Highly Functionalized Spirocyclohexenes by Formal [4+2] Annulation of Arylidene Azlactones with Allenoates. ASIAN J ORG CHEM 2018; 7:1620-1625. [PMID: 30175031 PMCID: PMC6114148 DOI: 10.1002/ajoc.201800275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A straightforward phosphine-catalyzed formal [4+2] annulation between α-branched allenoates and arylidene azlactones has been developed to access highly functionalized spirocyclohexenes. This cyclization favors the γ-addition of the phosphine-activated allenoates over a β'-addition pathway. Detailed computational studies support the proposed mechanism and provide a reasonable explanation for the observed regioselectivity and the noted effect of the catalyst.
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Affiliation(s)
- Andreas Eitzinger
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040 Linz (Austria)
| | - Katharina Zielke
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040 Linz (Austria)
| | - Michael Widhalm
- University of Vienna, Institute of Chemical Catalysis, Wäringer Strasse 38, 1090 Vienna (Austria)
| | - Raphaël Robiette
- Université catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, 1348 Louvain-la-Neuve (Belgium)
| | - Mario Waser
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040 Linz (Austria)
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5
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Son J, Kim KH, Mo D, Wink DJ, Anderson LL. Single‐Step Modular Synthesis of Unsaturated Morpholine
N
‐Oxides and Their Cycloaddition Reactions. Angew Chem Int Ed Engl 2017; 56:3059-3063. [DOI: 10.1002/anie.201611791] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Jongwoo Son
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Ki Hwan Kim
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Dong‐Liang Mo
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Donald J. Wink
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Laura L. Anderson
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
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6
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Son J, Kim KH, Mo D, Wink DJ, Anderson LL. Single‐Step Modular Synthesis of Unsaturated Morpholine
N
‐Oxides and Their Cycloaddition Reactions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611791] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Jongwoo Son
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Ki Hwan Kim
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Dong‐Liang Mo
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Donald J. Wink
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
| | - Laura L. Anderson
- Department of Chemistry University of Illinois at Chicago 845 W. Taylor St. Chicago IL USA
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