1
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Jain A, Kumari A, Metre RK, Rana NK. Diastereoselective synthesis of trans-2,3-dihydroindoles via formal [4 + 1] annulation reactions of a sulfonium ylide. Org Biomol Chem 2024; 22:621-632. [PMID: 38165688 DOI: 10.1039/d3ob01793a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
We have established an in situ generated sulfonium-ylide mediated annulation to construct 2,3-disubstituted-2,3-dihydroindoles. The [4 + 1] annulation approach relied on Michael addition/substitution reactions. These reactions were carried out at ambient temperature to deliver dihydroindoles with excellent yields and diastereoselectivities. Moreover, the versatility of this approach allows for the introduction of various functional groups, enabling further diversification of the dihydroindoles. Also, the cascade approach was broadened to synthesize dihydrobenzofurans.
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Affiliation(s)
- Anshul Jain
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342030, India.
| | - Akanksha Kumari
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342030, India.
| | - Ramesh K Metre
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342030, India.
| | - Nirmal K Rana
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur-342030, India.
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2
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Ban K, Imai K, Oyama S, Tokunaga J, Ikeda Y, Uchiyama H, Kadota K, Tozuka Y, Akai S, Sawama Y. Sulfonium Salt Reagents for the Introduction of Deuterated Alkyl Groups in Drug Discovery. Angew Chem Int Ed Engl 2023; 62:e202311058. [PMID: 37726202 DOI: 10.1002/anie.202311058] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 09/21/2023]
Abstract
The pharmacokinetics of pharmaceutical drugs can be improved by replacing C-H bonds with the more stable C-D bonds at the α-position to heteroatoms, which is a typical metabolic site for cytochrome P450 enzymes. However, the application of deuterated synthons is limited. Herein, we established a novel concept for preparing deuterated reagents for the successful synthesis of complex drug skeletons with deuterium atoms at the α-position to heteroatoms. (dn -Alkyl)diphenylsulfonium salts prepared from the corresponding nondeuterated forms using inexpensive and abundant D2 O as the deuterium source with a base, were used as electrophilic alkylating reagents. Additionally, these deuterated sulfonium salts were efficiently transformed into dn -alkyl halides and a dn -alkyl azide as coupling reagents and a dn -alkyl amine as a nucleophile. Furthermore, liver microsomal metabolism studies revealed deuterium kinetic isotope effects (KIE) in 7-(d2 -ethoxy)flavone. The present concept for the synthesis of deuterated reagents and the first demonstration of a KIE in a d2 -ethoxy group will contribute to drug discovery research based on deuterium chemistry.
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Affiliation(s)
- Kazuho Ban
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Keisuke Imai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Shuki Oyama
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Jin Tokunaga
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Yui Ikeda
- Department of Formulation Design and Pharmaceutical Technology, Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Hiromasa Uchiyama
- Department of Formulation Design and Pharmaceutical Technology, Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Kazunori Kadota
- Department of Formulation Design and Pharmaceutical Technology, Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Yuichi Tozuka
- Department of Formulation Design and Pharmaceutical Technology, Faculty of Pharmacy, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Shuji Akai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Yoshinari Sawama
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka, 565-0871, Japan
- Deuterium Science Research Unit, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
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3
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Kumari A, Jain A, Shukla K, Patra R, Rana NK. A reusable polymer anchored pyridine mediated formal [4 + 1] annulation reaction for the diastereoselective synthesis of 2,3-dihydrobenzofurans. Org Biomol Chem 2023. [PMID: 37376919 DOI: 10.1039/d3ob00804e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
We have developed a highly stereoselective formal [4 + 1] annulation reaction to construct trans-2,3-dihydrobenzofurans utilising in situ generated supported pyridinium ylide. This approach has excellent substrate versatility and gram-scale synthesis capability. Moreover, the polymer-anchored pyridine has been recovered and reused multiple times. The product has been transformed into valuable molecules.
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Affiliation(s)
- Akanksha Kumari
- Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan 342030, India.
| | - Anshul Jain
- Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan 342030, India.
| | - Khyati Shukla
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India
| | - Ranjan Patra
- Amity Institute of Click Chemistry Research & Studies, Amity University, Uttar Pradesh 201303, India
| | - Nirmal K Rana
- Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan 342030, India.
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4
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Jain A, Regina A, Kumari A, Patra R, Paranjothy M, Rana NK. Reusable Supported Pyridine-Mediated Cascade Synthesis of trans-2,3-Dihydroindoles via In Situ-Generated N-Ylide. Org Lett 2023; 25:3790-3795. [PMID: 37184141 DOI: 10.1021/acs.orglett.3c01295] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Merrifield resin-anchored pyridines were prepared and applied as reusable mediators for trans-selective cascade synthesis of 2,3-dihydroindoles. The developed approach relied on in situ N-ylide formation followed by Michael substitution reactions. The cascade reaction was also carried out efficiently with simple pyridine. The products were further transformed into synthetically valuable compounds, and supported pyridine was reused for multiple cycles. Density functional theory calculations confirmed the trans-selectivity as the lower-energy pathway.
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Affiliation(s)
- Anshul Jain
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342030, India
| | - Anitta Regina
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342030, India
| | - Akanksha Kumari
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342030, India
| | - Ranjan Patra
- Amity Institute of Click Chemistry Research & Studies, Amity University, Noida, Uttar Pradesh 201303, India
| | - Manikandan Paranjothy
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342030, India
| | - Nirmal K Rana
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342030, India
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5
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C – C coupling of alkynes to the CH2 group in a 1-phosphonioethenyl ligand in a zwitterionic dirhenium carbonyl complex. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Dequina HJ, Eshon J, Schmid SC, Raskopf WT, Sanders KM, Fernández I, Schomaker JM. Re-Evaluation of Product Outcomes in the Rh-Catalyzed Ring Expansion of Aziridines with N-Sulfonyl-1,2,3-Triazoles. J Org Chem 2022; 87:10902-10907. [PMID: 35947772 DOI: 10.1021/acs.joc.2c01186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
N-heterocycles are prevalent in pharmaceuticals and natural products, but traditional methods often do not introduce significant stereochemical complexity into the ring. We previously reported a Rh-catalyzed ring expansion of aziridines and N-sulfonyl-1,2,3-triazoles to furnish dehydropiperazines with excellent diastereocontrol. However, later studies employing ketone-containing carbene precursors showed that [3,9]-bicyclic aziridine formation competes with production of the desired heterocyclic scaffolds. In light of these surprising results, our initial findings were re-examined both experimentally and computationally to reveal how noncovalent interactions and restricted bond rotation in the aziridinium ylide intermediate promote this unexpected reaction pathway.
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Affiliation(s)
- Hillary J Dequina
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Josephine Eshon
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Steven C Schmid
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - William T Raskopf
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Kyana M Sanders
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Israel Fernández
- Departamento de Química Orgánica I and Centro de Innovación en Química Avazanda (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Jennifer M Schomaker
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
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7
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Adams RD, Kaushal M, Rassolov VA, Smith MD. Synthesis and Chemistry of Ammonioethenyl and Phosphonioethenyl Ligands in Zwitterionic Dirhenium Carbonyl Complexes. Inorg Chem 2022; 61:12262-12274. [PMID: 35895600 DOI: 10.1021/acs.inorgchem.2c01471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New zwitterionic dirhenium carbonyl complexes containing ammonioethenyl and phosphonioethenyl ligands have been synthesized and studied. The reaction of Re2(CO)10 with C2H2 and Me3NO yielded the dirhenium complex Re2(CO)9(NMe3) (6) and the new zwitterionic complex Re2(CO)9[η1-E-2-CH═CH(NMe3)] (7). Compound 6 was characterized structurally and was found to have a NMe3 ligand in an equatorial coordination site cis to a long Re-Re single bond, Re-Re = 3.0938(2) Å. Compound 7 can be obtained from the reaction of 6 with ethyne (C2H2) formally by the insertion of ethyne into the Re-N bond to the NMe3 ligand. Compound 7 contains a 2-trimethylammonioethenyl ligand, -CH═CH(+NMe3), that is formally a zwitterion having a positive charge on the nitrogen atom and a negative charge on the terminal carbon atom. When coordinated to rhenium by the terminal ethenyl carbon atom, the negative charge on the -CH═CH(+NMe3) carbon atom is formally transferred to the rhenium atom. The reaction of Re2(CO)10 with C2H2 and NEt3 in the presence of Me3NO yielded the new dirhenium complex Re2(CO)9[η1-E-2-CH═CH(NEt3)] (8) together with some 6 and 7. Compound 8 is structurally similar to 7, but it contains a NEt3 group in the ammonioethenyl ligand in the place of the NMe3 group in 7. Reactions of 7 with PMePh2 and PPh3 yielded the zwitterionic 2-arylphosphonioethenyl-coordinated dirhenium carbonyl complexes, Re2(CO)9[η1-E-2-CH═CH(PPh2Me)] (9a) and Re2(CO)9[η1-E-2-CH═CH(PPh3)] (9b), and the zwitterionic 1-phosphonioethenyl ligand in the dirhenium carbonyl complexes, Re2(CO)9[η1-1-C(PPh2Me)(═CH2)] (10a), Re2(CO)8[μ-η2-1-C(PPh2Me)(═CH2)] (11a), and Re2(CO)8[[μ-η2-1-C(PPh3)(CH2)] (11b). Compound 10a was converted to 11a and the new compound Re2(CO)7(μ-H)[μ-η2-1-(CH2C)P(Ph)(Me)(o-C6H4)], (12) by decarbonylation using Me3NO. Compound 12 contains an ortho-metalated phenyl ring. The new products 6,7, 8, 9b, 10a, 11a, 11b and 12 were characterized structurally by single-crystal X-ray diffraction analyses.
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Affiliation(s)
- Richard D Adams
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Meenal Kaushal
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Vitaly A Rassolov
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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8
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Nicastri KA, Zappia SA, Pratt JC, Duncan JM, Guzei IA, Fernández I, Schomaker JM. Tunable Aziridinium Ylide Reactivity: Non-covalent Interactions Enable Divergent Product Outcomes. ACS Catal 2022; 12:1572-1580. [PMID: 35291380 DOI: 10.1021/acscatal.1c05413] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Methods for rapid preparation of densely functionalized and stereochemically complex N-heterocyclic scaffolds are in demand for exploring potential bioactive chemical space. This work describes experimental and computational studies to better understand the features of aziridinium ylides as intermediates for the synthesis of highly substituted dehydromorpholines. The development of this chemistry has enabled the extension of aziridinium ylide chemistry to the concomitant formation of both a C-N and a C-O bond in a manner that preserves the stereochemical information embedded in the substrate. Additionally, we have uncovered several key insights that describe the importance of steric effects, rotational barriers around the C-N bond of the aziridinium ylide, and non-covalent interactions (NCIs) on the ultimate reaction outcome. These critical insights will assist in the further development of this chemistry to generate N-heterocycles that will further expand complex amine chemical space.
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Affiliation(s)
- Kate A. Nicastri
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Soren A. Zappia
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Jared C. Pratt
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Julia M. Duncan
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Israel Fernández
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Jennifer M. Schomaker
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
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9
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ouyang Q, Zeng R, Wang Z, Peng R, Yan P, Yang J, Zhou Q, Gu J, zheng P, Chen YC. Feeding sequence-regulated divergent (4 + 1 + 1’) annulations of α-bromo carbonyls and 1-azadienes via computational calculations-based mechanism elucidation. Org Chem Front 2022. [DOI: 10.1039/d2qo00052k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By investigating the mechanism of our previously reported (4 + 1 + 1) annulations of α-bromo carbonyls and 1-azadienes via density functional theory (DFT) calculations, the formation of a carbon...
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10
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Ushakov P, Ioffe S, Sukhorukov AY. Recent advances in the application of ylide-like species in [4+1]-annulation reactions: an update review. Org Chem Front 2022. [DOI: 10.1039/d2qo00698g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this review, advances in [4+1]‐annulation reactions involving sulfonium, sulfoxonium and ammonium ylides, as well as diazo compounds and carbenes are summarized over the last 6 years. Newly emerged methods...
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11
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Poulladofonou G, Neumann K. Poly(sulfur ylides): a new class of zwitterionic polymers with distinct thermal and solution behaviour. Polym Chem 2022. [DOI: 10.1039/d2py00851c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Readily available poly(sulfur ylides) are described as a new class of zwitterionic polymers that show distinct solution and thermal behavior.
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Affiliation(s)
- Georgia Poulladofonou
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - Kevin Neumann
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
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12
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Brol A, Olszewski TK. Synthesis and stability of 1-aminoalkylphosphonic acid quaternary ammonium salts. Org Biomol Chem 2021; 19:6422-6430. [PMID: 34018544 DOI: 10.1039/d1ob00703c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An effective protocol for the quaternization of simple 1-aminoalkylphosphonic acids under basic conditions using Me2SO4 as a convenient alkylating agent is reported. During the course of the reaction, phosphonic acid quaternary ammonium derivatives, along with their corresponding monoesters are formed. Subsequent direct acidic hydrolysis of the crude reaction mixture leads to the desired novel N,N,N-trialkyl-N-(1-phosphonoalkyl)ammonium salts with overall yields of up to 88%. The developed protocol is general in scope and the products are purified by simple crystallization to give stable solids. Novel quaternary ammonium salts bearing a phosphonic group are generally unreactive in acidic and alkaline media. However, some of them undergo Hofmann elimination and substitution reactions in the presence of a base.
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Affiliation(s)
- Anna Brol
- Faculty of Chemistry, Wrocław University of Science and Technology, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
| | - Tomasz K Olszewski
- Faculty of Chemistry, Wrocław University of Science and Technology, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
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13
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Weinzierl D, Waser M. Synthesis of [2.2]Paracyclophane‐Based Glycidic Amides Using Chiral Ammonium Ylides. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100073] [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]
Affiliation(s)
- David Weinzierl
- Institute of Organic Chemistry Johannes Kepler University Linz Altenbergerstr. 69 AT-4040 Linz Austria
| | - Mario Waser
- Institute of Organic Chemistry Johannes Kepler University Linz Altenbergerstr. 69 AT-4040 Linz Austria
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14
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Demidov MR, Osyanin VA, Osipov DV, Klimochkin YN. Three-Component Condensation of Pyridinium Ylides, β-Ketonitriles, and Aldehydes with Divergent Regioselectivity: Synthesis of 4,5-Dihydrofuran-3- and 2 H-Pyran-5-carbonitriles. J Org Chem 2021; 86:7460-7476. [PMID: 34014677 DOI: 10.1021/acs.joc.1c00423] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A library of trans-4,5-dihydrofuran-3-carbonitriles was synthesized in a diastereoselective manner in good yields by the three-component reaction of β-ketonitriles, carbonyl- and semistabilized pyridinium ylide precursors, and aldehydes in the presence of piperidine. This one-pot transformation generates two C-C and one C-O bond and proceeds through a cascade Knoevenagel condensation, a Michael addition, and intramolecular SN2 cyclization. Formation of cyclopropanecarbonitrile derivatives, which in some cases were obtained as major products, was found to be a competing reaction. The use of arylglyoxals changes regioselectivity and leads to 2-hydroxy-2H-pyran-5-carbonitriles.
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Affiliation(s)
- Maxim R Demidov
- Samara State Technical University, 443100 Samara, Russian Federation
| | - Vitaly A Osyanin
- Samara State Technical University, 443100 Samara, Russian Federation
| | - Dmitry V Osipov
- Samara State Technical University, 443100 Samara, Russian Federation
| | - Yuri N Klimochkin
- Samara State Technical University, 443100 Samara, Russian Federation
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15
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Hosseini SJ, Emamian S, Hassani H, Hamzehzadeh ND. Stereoselective Cyclopropanation of
Arylmethylidenemalononitriles by 2,6-Dimethylquinoline: A Molecular Electron Density
Theory Study. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428020120209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Li QZ, Jia ZQ, Chen L, Zhang X, Leng HJ, Zeng R, Liu YQ, Zou WL, Li JL. Construction of a Benzo[ b]azepine Skeleton through Decarboxylative Ylide [6+1] Annulations with Modified Vinyl Benzoxazinanones. Org Lett 2021; 23:814-818. [PMID: 33501832 DOI: 10.1021/acs.orglett.0c04041] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A Lewis acid-promoted [6+1] annulation between sulfur ylides and modified vinyl benzoxazinanones was described. In this reaction, the newly designed vinyl benzoxazinanones could serve as a novel six-atom synthon, and the key to success is the installation of an electron-withdrawing group on the alkene moiety of the benzoxazinanones. A broad range of substrates are compatible with this mild reaction system, thereby providing a facile and practical approach for constructing a benzo[b]azepine skeleton.
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Affiliation(s)
- Qing-Zhu Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Zhi-Qiang Jia
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Lin Chen
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Xiang Zhang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Hai-Jun Leng
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Rong Zeng
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Yan-Qing Liu
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Wen-Lin Zou
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
| | - Jun-Long Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China
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17
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Jana S, Guo Y, Koenigs RM. Recent Perspectives on Rearrangement Reactions of Ylides via Carbene Transfer Reactions. Chemistry 2021; 27:1270-1281. [PMID: 32754993 PMCID: PMC7894496 DOI: 10.1002/chem.202002556] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/29/2020] [Indexed: 01/24/2023]
Abstract
Among the available methods to increase the molecular complexity, sigmatropic rearrangements occupy a distinct position in organic synthesis. Despite being known for over a century sigmatropic rearrangement reactions of ylides via carbene transfer reaction have only recently come of age. Most of the ylide mediated rearrangement processes involve rupture of a σ-bond and formation of a new bond between π-bond and negatively charged atom followed by simultaneous redistribution of π-electrons. This minireview describes the advances in this research area made in recent years, which now opens up metal-catalyzed enantioselective sigmatropic rearrangement reactions, metal-free photochemical rearrangement reactions and novel reaction pathways that can be accessed via ylide intermediates.
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Affiliation(s)
- Sripati Jana
- Institute of Organic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Yujing Guo
- Institute of Organic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Rene M. Koenigs
- Institute of Organic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
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18
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Xu FS, Yan C, Sun J, Yan CG. Efficient synthesis of tetra- and penta-substituted benzenes via a domino annulation reaction of a pyridinium ylide and chalcone o-enolate. NEW J CHEM 2021. [DOI: 10.1039/d1nj03772b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A very simple and highly efficient protocol for synthesizing tetra- and penta-substituted benzene derivatives has been developed.
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Affiliation(s)
- Feng-Shun Xu
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chen Yan
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Jing Sun
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chao-Guo Yan
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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19
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Sun JC, Wang XH, Ji CB, Peng YY, Zeng XP. Enantioselective Construction of Chiral Cyclopropa[ c]coumarins via Lewis Base-Catalyzed Cyclopropanation. J Org Chem 2020; 85:14963-14970. [PMID: 33136397 DOI: 10.1021/acs.joc.0c01782] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first highly enantioselective construction of chiral cyclopropa[c]coumarins was described. Using commercially available (bis)cinchona alkaloid (DHQ)2PYR as the chiral Lewis base catalyst, together with Cs2CO3 as the achiral base, the reaction of a series of coumarin-3-carboxylate and 3-benzoyl coumarins with tert-butyl 2-bromoacetate could give rise to the corresponding cyclopropa[c]coumarins bearing three continuous chiral stereocenters in 83-93% ee and 90-97% ee, respectively. The reaction is proposed to proceed via an in situ generated ammonium ylide intermediate.
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Affiliation(s)
- Jun-Chao Sun
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Xiao-Hui Wang
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Cong-Bin Ji
- Jiangxi Provincial Research of Targeting Pharmaceutical Engineering Technology, Shangrao Normal University, Shangrao, Jiangxi 334001, China
| | - Yi-Yuan Peng
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Xing-Ping Zeng
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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20
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Dequina HJ, Schomaker JM. Aziridinium Ylides: Underutilized Intermediates for Complex Amine Synthesis. TRENDS IN CHEMISTRY 2020; 2:874-887. [PMID: 33665590 DOI: 10.1016/j.trechm.2020.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Harnessing the chemistry of onium ylide intermediates generated from transition metal catalysis is a powerful strategy to convert simple precursors into complex scaffolds. While the chemistry of onium ylides has been studied for over three decades, transformations of aziridinium ylides have just recently emerged as a versatile way to exploit the strain of these reactive intermediates to furnish densely functionalized N-heterocycles in a highly stereocontrolled manner. Herein, we provide a short overview of the key concepts and recent developments in this area, with a focus on how mechanistic studies to delineate the factors controlling the reactivity of aziridinium ylides can stimulate fruitful future investigations.
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Affiliation(s)
- Hillary J Dequina
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Jennifer M Schomaker
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
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21
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Munakala A, Gollapelli KK, Nanubolu JB, Chegondi R. Silver(I)-Catalyzed Oxidative Intramolecular Cyclopropanation: Access to Complex Tricyclo[3.3.1.0]nonanediones via Semipinacol-Type Rearrangement. Org Lett 2020; 22:7019-7024. [DOI: 10.1021/acs.orglett.0c02555] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Anandarao Munakala
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | | | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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22
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Winter M, Schütz R, Eitzinger A, Ofial AR, Waser M. CF 3-Containing para-Quinone Methides for Organic Synthesis. European J Org Chem 2020; 2020:3812-3817. [PMID: 32624681 PMCID: PMC7335660 DOI: 10.1002/ejoc.202000295] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Indexed: 12/31/2022]
Abstract
A new family of CF3-containing para-quinone methides (CF3-QMs) was systematically investigated for its suitability in organic synthesis. Addition of different nucleophiles gives access to target molecules with a benzylic CF3-containing stereogenic center straightforwardly. The electrophilicity parameter E of the prototypical CF3-QM 2,6-di-tert-butyl-4-(2,2,2-trifluoroethylidene)cyclohexa-2,5-dien-1-one was determined to be -11.68 according to the Mayr scale, making it one of the most reactive quinone methides known so far.
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Affiliation(s)
- Michael Winter
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstraße 694040LinzAustria
| | - Roman Schütz
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstraße 694040LinzAustria
| | - Andreas Eitzinger
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstraße 694040LinzAustria
| | - Armin R. Ofial
- Department ChemieLudwig‐Maximilians‐Universität MünchenButenandtstraße 5‐1381377MünchenGermany
| | - Mario Waser
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstraße 694040LinzAustria
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23
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Dequina HJ, Eshon J, Raskopf WT, Fernández I, Schomaker JM. Rh-Catalyzed Aziridine Ring Expansions to Dehydropiperazines. Org Lett 2020; 22:3637-3641. [PMID: 32320259 PMCID: PMC8025198 DOI: 10.1021/acs.orglett.0c01124] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Piperazines are prevalent in pharmaceuticals and natural products, but traditional methods do not typically introduce stereochemical complexity into the ring. To expand access to these scaffolds, we report Rh-catalyzed ring expansions of aziridines and N-sulfonyl-1,2,3-triazoles to furnish dehydropiperazines with excellent diastereocontrol. Productive ring expansion proceeds via a pseudo-1,4-sigmatropic rearrangement of an aziridinium ylide species. However, the structural features of the carbene precursor are important, as pyridotriazoles undergo competing cheletropic extrusion to furnish ketimines.
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Affiliation(s)
- Hillary J. Dequina
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Josephine Eshon
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - William T. Raskopf
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Israel Fernández
- Departamento de Química Orádnica I and Centro de Innovación en Química Avazanda (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Jennifer M. Schomaker
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
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24
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Drennhaus T, Öhler L, Djalali S, Höfmann S, Müller C, Pietruszka J, Worgull D. Enantioselective Ammonium Ylide Mediated One‐Pot Synthesis of Highly Substituted
γ
‐Butyrolactones. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Till Drennhaus
- Institute of Bio- and Geosciences (IBG-1)Forschungszentrum Jülich 52426 Jülich Germany
| | - Laura Öhler
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
| | - Saveh Djalali
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
| | - Svenja Höfmann
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
| | - Clemens Müller
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
| | - Jörg Pietruszka
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
- Institute of Bio- and Geosciences (IBG-1)Forschungszentrum Jülich 52426 Jülich Germany
| | - Dennis Worgull
- Institute of Bioorganic ChemistryHeinrich Heine University Düsseldorf located at Forschungszentrum Jülich Stetternicher Forst, Building 15.8 52426 Jülich Germany
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25
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Nakamura T, Okuno K, Nishiyori R, Shirakawa S. Hydrogen‐Bonding Catalysis of Alkyl‐Onium Salts. Chem Asian J 2020; 15:463-472. [DOI: 10.1002/asia.201901652] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Takumi Nakamura
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Ken Okuno
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Ryuichi Nishiyori
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Seiji Shirakawa
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
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26
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Zheng PF, Zeng R, Jiang K, Li HW, Ye Y, Mu C, Shuai L, Ouyang Q, Chen YC. (3 + 1) Annulation/Rearrangement Cascade of C,N-Cyclic Azomethine Imines and 3-Chlorooxindoles: Construction of Hexahydroindeno[2,1- c]pyrazole Spirooxindole Frameworks. Org Lett 2019; 21:10052-10056. [PMID: 31825631 DOI: 10.1021/acs.orglett.9b03996] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The Brønsted base promoted (3 + 1) annulation reaction of C,N-cyclic azomethine imines and 3-chlorooxindoles was investigated, finally delivering complex hexahydroindeno[2,1-c] pyrazoles incorporating a spirocyclic oxindole motif after an unexpected rearrangement process. The asymmetric version of this new transformation could be accomplished, but slow racemization of the chiral product was observed at ambient temperature. Experiments and DFT calculations were further conducted to elucidate the reaction process and racemization mechanism.
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Affiliation(s)
- Peng-Fei Zheng
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Rong Zeng
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Kun Jiang
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Hong-Wei Li
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Ying Ye
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Chao Mu
- College of Chemistry and Environmental Engineering , Sichuan University of Science & Engineering , Zigong , 643000 , China
| | - Li Shuai
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Qin Ouyang
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China
| | - Ying-Chun Chen
- College of Pharmacy , Third Military Medical University , Chongqing , 400038 , China.,Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy , Sichuan University , Chengdu 610041 , China
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27
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Jalali H, Hosseini SJ, Ali‐Asgari S, Izadi Nia J. Stereoselective aziridination of imines via ammonium ylides: A molecular electron density theory study. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3798] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hamideh Jalali
- Chemistry Department, Shahrood BranchIslamic Azad University Shahrood Iran
| | | | - Safa Ali‐Asgari
- Chemistry Department, Shahrood BranchIslamic Azad University Shahrood Iran
| | - Jafar Izadi Nia
- Chemistry Department, Shahrood BranchIslamic Azad University Shahrood Iran
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28
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Amiri A, Emamian S, Hosseini SJ, Ali‐Asgari S. Stereoselective cyclopropanation of olefins through ammonium ylides: A molecular electron density theory study. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.4008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Arash Amiri
- Chemistry DepartmentIslamic Azad University, Shahrood Branch Shahrood Iran
| | - Saeedreza Emamian
- Chemistry DepartmentIslamic Azad University, Shahrood Branch Shahrood Iran
| | | | - Safa Ali‐Asgari
- Chemistry DepartmentIslamic Azad University, Shahrood Branch Shahrood Iran
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29
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Zeng R, Shan C, Liu M, Jiang K, Ye Y, Liu TY, Chen YC. [4 + 1 + 1] Annulations of α-Bromo Carbonyls and 1-Azadienes toward Fused Benzoazaheterocycles. Org Lett 2019; 21:2312-2316. [PMID: 30900459 DOI: 10.1021/acs.orglett.9b00598] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An unexpected [4 + 1 + 1] annulation between α-bromo carbonyls and 1-azadienes, derived from 2-methylenebenzofuran-3(2 H)-ones or 2-methylenebenzo[ b]thiophene-3(2 H)-ones, has been observed in the presence of DABCO and Cs2CO3. These reactions stand in contrast to the common [4 + 1] cyclization reactions of azadienes with the related sulfonium ylides. A range of fused benzofuro[3,2- b]pyridines and benzo[4,5]thieno[3,2- b]pyridines have been efficiently constructed in fair to excellent yields.
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Affiliation(s)
- Rong Zeng
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Changyu Shan
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Ming Liu
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Kun Jiang
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Ying Ye
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Tian-Yu Liu
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China
| | - Ying-Chun Chen
- College of Pharmacy , Third Military Medical University , Shapingba, Chongqing 400038 , China.,Department of Medicinal Chemistry, West China School of Pharmacy , Sichuan University , Chengdu 610041 , China
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30
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Xu YN, Tian SK. Facile construction of three-membered rings via benzyne-promoted Darzens-type reaction of tertiary amines. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.11.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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31
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Emamian S, Domingo LR, Ríos-Gutiérrez M, Zahedi E, Hosseini SJ. Aziridination of Aromatic Aldimines Through Stabilized Ammonium Ylides: A Molecular Electron Density Theory Study. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801763] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Saeedreza Emamian
- Chemistry Department; Shahrood Branch; Islamic Azad University; Shahrood Iran
| | - Luis R. Domingo
- Department of Organic Chemistry; University of Valencia; Dr Moliner 50 46100 Burjassot, Valencia Spain
| | - Mar Ríos-Gutiérrez
- Department of Organic Chemistry; University of Valencia; Dr Moliner 50 46100 Burjassot, Valencia Spain
| | - Ehsan Zahedi
- Chemistry Department; Shahrood Branch; Islamic Azad University; Shahrood Iran
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32
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33
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Roiser L, Zielke K, Waser M. Formal (4+1)-Cyclization of Ammonium Ylides with Vinylogous para-Quinone Methides. SYNTHESIS-STUTTGART 2018; 50:4047-4054. [PMID: 30297974 DOI: 10.1055/s-0037-1610268] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The formal (4+1)-cyclization between in situ generated achiral carbonyl-stabilized ammonium ylides and vinylogous p-quinone methides can be carried out under operationally simple conditions, leading to two different double bond regioisomers depending on the used conditions. Besides these racemic approaches, also a first proof-of-concept for enantioselective versions of these reactions has been obtained.
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Affiliation(s)
- Lukas Roiser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria
| | - Katharina Zielke
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria
| | - Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria
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