1
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Sugiyama Y, Soda Y, Yoritate M, Tajima H, Takahashi Y, Shibuya K, Ogihara C, Yokoyama T, Oishi T, Sato T, Chida N. Lactam Strategy Using Amide-Selective Nucleophilic Addition for the Quick Access to Complex Amines: Unified Total Synthesis of Stemoamide-Type Alkaloids. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasukazu Sugiyama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yasuki Soda
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Makoto Yoritate
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Hayato Tajima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yoshito Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kana Shibuya
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Chisato Ogihara
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takashi Yokoyama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takeshi Oishi
- School of Medicine, Keio University, 4-1-1, Hiyoshi, Kohoku-ku, Yokohama 223-8521, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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2
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Chen J, Lim JW, Ong DY, Chiba S. Iterative addition of carbon nucleophiles to N, N-dialkyl carboxamides for synthesis of α-tertiary amines. Chem Sci 2021; 13:99-104. [PMID: 35059156 PMCID: PMC8694388 DOI: 10.1039/d1sc05876b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 11/25/2021] [Indexed: 12/27/2022] Open
Abstract
A protocol for the synthesis of α-tertiary amines was developed by iterative addition of carbon nucleophiles to N,N-dialkyl carboxamides. Nucleophilic 1,2-addition of organolithium reagents to carboxamides forms anionic tetrahedral carbinolamine (hemiaminal) intermediates, which are subsequently treated with bromotrimethylsilane (Me3SiBr) followed by organomagnesium (Grignard) reagents, organolithium reagents or tetrabutylammonium cyanide, affording α-tertiary amines. Employment of (trimethylsilyl)methylmagnesium bromide as the 2nd nucleophile allowed for aza-Peterson olefination of the resulting α-tertiary (trimethylsilyl)methylamines with acidic work-up, resulting in the formation of 1,1-diarylethylenes.
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Affiliation(s)
- Jiahua Chen
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Jun Wei Lim
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Derek Yiren Ong
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Shunsuke Chiba
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
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3
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Gallagher-Duval S, Lapointe V, Bélanger G. Functionalized Polyhydroquinolines from Amino Acids Using a Key One-Pot Cyclization Cascade and Application to the Synthesis of (±)-Δ 7-Mesembrenone. Org Lett 2021; 23:8606-8611. [PMID: 34694806 DOI: 10.1021/acs.orglett.1c03323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Substituted polyhydroquinolines are ubiquitous skeletal cores found in drugs and bioactive natural products. As a new route to access this motif, we successfully developed a one-pot cyclization cascade with high chemocontrol and diastereoselectivity. The sequence generates two cycles, three carbon-carbon bonds, and an all-carbon quaternary center in a highly convergent process. Functionalized polyhydroquinolines and congeners can be accessed from commercially available amino acids. This versatile and robust strategy was applied to the synthesis of (±)-Δ7-mesembrenone.
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Affiliation(s)
- Shawn Gallagher-Duval
- Département de chimie, Université de Sherbrooke, 2500, boulevard de l'Université, Sherbrooke, Québec, Canada J1K 2R1
| | - Vincent Lapointe
- Département de chimie, Université de Sherbrooke, 2500, boulevard de l'Université, Sherbrooke, Québec, Canada J1K 2R1
| | - Guillaume Bélanger
- Département de chimie, Université de Sherbrooke, 2500, boulevard de l'Université, Sherbrooke, Québec, Canada J1K 2R1
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4
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Outin J, Quellier P, Bélanger G. Sequential One-Pot Vilsmeier-Haack and Organocatalyzed Mannich Cyclizations to Functionalized Benzoindolizidines and Benzoquinolizidines. J Org Chem 2020; 85:4712-4729. [PMID: 32189502 DOI: 10.1021/acs.joc.9b03449] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of new one-pot sequential cyclizations involving a Vilsmeier-Haack reaction followed by an organocatalyzed Mannich reaction is reported. This synthetic strategy gives access to functionalized indolizidines and quinolizidines in one operation from readily synthesized precursors. Yields and diastereoselectivities are good to excellent when formamides are used to trigger the key step, bearing either an electron-rich aryl or a pyrrole as the nucleophilic partner in the first cyclization.
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Affiliation(s)
- Johanne Outin
- Département de Chimie, Université de Sherbrooke, 2500 boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
| | - Pauline Quellier
- Département de Chimie, Université de Sherbrooke, 2500 boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
| | - Guillaume Bélanger
- Département de Chimie, Université de Sherbrooke, 2500 boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
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5
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Takahashi Y, Sato T, Chida N. Iridium-catalyzed Reductive Nucleophilic Addition to Tertiary Amides. CHEM LETT 2019. [DOI: 10.1246/cl.190467] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Yoshito Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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6
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Hiraoka S, Matsumoto T, Matsuzaka K, Sato T, Chida N. Approach to Fully Substituted Cyclic Nitrones from
N
‐Hydroxylactam Derivatives: Development and Application to the Total Synthesis of Cylindricine C. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shobu Hiraoka
- Department of Applied ChemistryFaculty of Science and TechnologyKeio University 3-14-1, Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Tsutomu Matsumoto
- Department of Applied ChemistryFaculty of Science and TechnologyKeio University 3-14-1, Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Koki Matsuzaka
- Department of Applied ChemistryFaculty of Science and TechnologyKeio University 3-14-1, Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Takaaki Sato
- Department of Applied ChemistryFaculty of Science and TechnologyKeio University 3-14-1, Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Noritaka Chida
- Department of Applied ChemistryFaculty of Science and TechnologyKeio University 3-14-1, Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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7
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Yamamoto S, Komiya Y, Kobayashi A, Minamikawa R, Oishi T, Sato T, Chida N. Asymmetric Total Synthesis of Fasicularin by Chiral N-Alkoxyamide Strategy. Org Lett 2019; 21:1868-1871. [DOI: 10.1021/acs.orglett.9b00478] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shio Yamamoto
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yukinori Komiya
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Akihiro Kobayashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Ryo Minamikawa
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takeshi Oishi
- School of Medicine, Keio University, 4-1-1, Hiyoshi,
Kohoku-ku, Yokohama 223-8521, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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8
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Hiraoka S, Matsumoto T, Matsuzaka K, Sato T, Chida N. Approach to Fully Substituted Cyclic Nitrones from N-Hydroxylactam Derivatives: Development and Application to the Total Synthesis of Cylindricine C. Angew Chem Int Ed Engl 2019; 58:4381-4385. [PMID: 30720229 DOI: 10.1002/anie.201901049] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Indexed: 01/03/2023]
Abstract
An approach to cyclic nitrones from N-hydroxylactam derivatives is documented. The nucleophilic addition of an organolithium reagent to an N-OSEM [SEM=2-(trimethylsilyl)ethoxymethyl] lactam forms a five-membered chelated intermediate, which undergoes both elimination and deprotection to give a fully substituted nitrone in a one-pot process. When combined with the N-oxidation of easily available chiral lactams, this method becomes especially useful for the quick synthesis of chiral nitrones in enantio-pure form, enabling the concise total synthesis of cylindricine C.
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Affiliation(s)
- Shobu Hiraoka
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Tsutomu Matsumoto
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Koki Matsuzaka
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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9
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Yang WW, Zhang JW, Chen LL, Fu JY, Zhu JY, Wang YB. Controllable synthesis of 3-iodo-2H-quinolizin-2-ones and 1,3-diiodo-2H-quinolizin-2-onesviaelectrophilic cyclization of azacyclic ynones. Chem Commun (Camb) 2019; 55:12607-12610. [DOI: 10.1039/c9cc06250e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach was developed to divergently synthesize 3-ipdo-2H-quinolizin-2-ones and 1,3-diiodo-2H-quinolizin-2-ones from azacyclic ynones with high regioselectivity under metal-free, room temperature conditions in air.
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Affiliation(s)
- Wan-Wan Yang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jing-Wen Zhang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Lu-Lu Chen
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Ji-Ya Fu
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jun-Yan Zhu
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Yan-Bo Wang
- Institute of Functional Organic Molecular Engineering
- Henan Engineering Laboratory of Flame-Retardant and Functional Materials
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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10
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Fukami Y, Wada T, Meguro T, Chida N, Sato T. Copper-catalyzed electrophilic amination using N-methoxyamines. Org Biomol Chem 2018; 14:5486-9. [PMID: 26548700 DOI: 10.1039/c5ob02167g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper-catalyzed electrophilic amination of a triarylboroxin using an N-methoxyamine to give quick access to a variety of anilines was reported. The reaction was especially useful for syntheses of functionalized anilines when combined with our previously reported nucleophilic addition to N-methoxyamides.
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Affiliation(s)
- Yutaro Fukami
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Takamasa Wada
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Tatsuhiko Meguro
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
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11
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Sato T, Yoritate M, Tajima H, Chida N. Total synthesis of complex alkaloids by nucleophilic addition to amides. Org Biomol Chem 2018; 16:3864-3875. [DOI: 10.1039/c8ob00733k] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
This mini review focuses on the recent progress of total synthesis of complex alkaloids based on the nucleophilic additions toN-alkoxyamides, tertiary amides and secondary amides.
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Affiliation(s)
- Takaaki Sato
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University 3-14-1
- Yokohama 223-8522
- Japan
| | - Makoto Yoritate
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University 3-14-1
- Yokohama 223-8522
- Japan
| | - Hayato Tajima
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University 3-14-1
- Yokohama 223-8522
- Japan
| | - Noritaka Chida
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University 3-14-1
- Yokohama 223-8522
- Japan
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12
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Katahara S, Kobayashi S, Fujita K, Matsumoto T, Sato T, Chida N. Reductive Approach to Nitrones from N-Siloxyamides and N-Hydroxyamides. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20170086] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Seiya Katahara
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
| | - Shoichiro Kobayashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
| | - Kanami Fujita
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
| | - Tsutomu Matsumoto
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522
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13
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Pace V, de la Vega-Hernández K, Urban E, Langer T. Chemoselective Schwartz Reagent Mediated Reduction of Isocyanates to Formamides. Org Lett 2016; 18:2750-3. [PMID: 27218199 DOI: 10.1021/acs.orglett.6b01226] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Addition of the in situ generated Schwartz reagent to widely available isocyanates constitutes a chemoselective, high-yielding, and versatile approach to the synthesis of variously functionalized formamides. Steric and electronic factors or the presence of sensitive functionalities (esters, nitro groups, nitriles, alkenes) do not compromise the potential of the method. Full preservation of the stereochemical information contained in the starting materials is observed. The use of formamides in the nucleophilic addition of organometallic reagents (Chida-Sato allylation, Charette-Huang addition to imidoyl triflate activated amides, Matteson homologation of boronic esters) is briefly investigated.
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Affiliation(s)
- Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna , Althanstrasse, 14, A-1090 Vienna, Austria
| | - Karen de la Vega-Hernández
- Department of Pharmaceutical Chemistry, University of Vienna , Althanstrasse, 14, A-1090 Vienna, Austria.,Institute of Pharmacy and Food Sciences, University of Havana , 23rd Street, 21425-13600 Havana, Cuba
| | - Ernst Urban
- Department of Pharmaceutical Chemistry, University of Vienna , Althanstrasse, 14, A-1090 Vienna, Austria
| | - Thierry Langer
- Department of Pharmaceutical Chemistry, University of Vienna , Althanstrasse, 14, A-1090 Vienna, Austria
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14
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Kaiser D, Maulide N. Making the Least Reactive Electrophile the First in Class: Domino Electrophilic Activation of Amides. J Org Chem 2016; 81:4421-8. [PMID: 27187724 DOI: 10.1021/acs.joc.6b00675] [Citation(s) in RCA: 162] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The electrophilic activation of amides, especially by the action of trifluoromethanesulfonic (triflic) anhydride, enables the formation of highly electrophilic and reactive intermediates, lending themselves to diverse reaction pathways. This synopsis sets out to highlight recent advances in the field of amide activation, focused on the use of triflic anhydride, and the myriad of transformations that can ensue upon addition of several classes of electrophiles to the intermittently generated high energy intermediates.
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Affiliation(s)
- Daniel Kaiser
- Faculty of Chemistry, Institute of Organic Chemistry, University of Vienna , Währinger Strasse 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Faculty of Chemistry, Institute of Organic Chemistry, University of Vienna , Währinger Strasse 38, 1090 Vienna, Austria
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15
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Katahara S, Kobayashi S, Fujita K, Matsumoto T, Sato T, Chida N. An Iridium-Catalyzed Reductive Approach to Nitrones from N-Hydroxyamides. J Am Chem Soc 2016; 138:5246-9. [DOI: 10.1021/jacs.6b02324] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Seiya Katahara
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Shoichiro Kobayashi
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kanami Fujita
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Tsutomu Matsumoto
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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16
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Zhang J, Zhang M, Du FS, Li ZC. Synthesis of Functional Polycaprolactones via Passerini Multicomponent Polymerization of 6-Oxohexanoic Acid and Isocyanides. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00096] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jian Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Department of Polymer Science & Engineering, College of Chemistry and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Mei Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Department of Polymer Science & Engineering, College of Chemistry and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Fu-Sheng Du
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Department of Polymer Science & Engineering, College of Chemistry and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Zi-Chen Li
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, Department of Polymer Science & Engineering, College of Chemistry and Molecular Engineering, Center for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
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17
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Sato T, Chida N. Nucleophilic Addition to N-Alkoxyamides: Development and Application to the Total Synthesis of Gephyrotoxin. J SYN ORG CHEM JPN 2016. [DOI: 10.5059/yukigoseikyokaishi.74.599] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
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18
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A general method for the direct transformation of common tertiary amides into ketones and amines by addition of Grignard reagents. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.074] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Shirokane K, Tanaka Y, Yoritate M, Takayama N, Sato T, Chida N. Total Syntheses of (±)-Gephyrotoxin and (±)-Perhydrogephyrotoxin. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20140398] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kenji Shirokane
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
| | - Yuya Tanaka
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
| | - Makoto Yoritate
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
| | - Nobuaki Takayama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University
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20
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Nakajima M, Sato T, Chida N. Iridium-Catalyzed Chemoselective Reductive Nucleophilic Addition to N-Methoxyamides. Org Lett 2015; 17:1696-9. [DOI: 10.1021/acs.orglett.5b00664] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Minami Nakajima
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry,
Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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21
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Déry M, Assouvie K, Heinrich N, Rajotte I, Lefebvre LPD, Legault MA, Spino C. N-Heterocycles from Chromium Aminocarbenes. Org Lett 2015; 17:1312-5. [DOI: 10.1021/acs.orglett.5b00313] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Martin Déry
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Kevin Assouvie
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Nora Heinrich
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Isabelle Rajotte
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | | | - Marc-André Legault
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Claude Spino
- Université de Sherbrooke, Département de Chimie, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
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22
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Huang PQ, Huang YH, Xiao KJ, Wang Y, Xia XE. A General Method for the One-Pot Reductive Functionalization of Secondary Amides. J Org Chem 2015; 80:2861-8. [DOI: 10.1021/jo502929x] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Pei-Qiang Huang
- Department
of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology,
Collaborative Innovation Centre of Chemistry for Energy Materials,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Ying-Hong Huang
- Department
of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology,
Collaborative Innovation Centre of Chemistry for Energy Materials,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Kai-Jiong Xiao
- Department
of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology,
Collaborative Innovation Centre of Chemistry for Energy Materials,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Yu Wang
- Department
of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology,
Collaborative Innovation Centre of Chemistry for Energy Materials,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Xiao-Er Xia
- Department
of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology,
Collaborative Innovation Centre of Chemistry for Energy Materials,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
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23
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Zheng JF, Qian XY, Huang PQ. Direct transformation of amides: a one-pot reductive Ugi-type three-component reaction of secondary amides. Org Chem Front 2015. [DOI: 10.1039/c5qo00146c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient reductive Ugi-type reaction employing common secondary amides as starting materials has been established. The reaction exhibited a broad substrate scope, good chemoselectivity and functional group tolerance.
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Affiliation(s)
- Jian-Feng Zheng
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Xiang-Yang Qian
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Pei-Qiang Huang
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
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24
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Pace V, Holzer W, Olofsson B. Increasing the Reactivity of Amides towards Organometallic Reagents: An Overview. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400630] [Citation(s) in RCA: 172] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Nakajima M, Oda Y, Wada T, Minamikawa R, Shirokane K, Sato T, Chida N. Chemoselective reductive nucleophilic addition to tertiary amides, secondary amides, and N-methoxyamides. Chemistry 2014; 20:17565-71. [PMID: 25345400 DOI: 10.1002/chem.201404648] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Indexed: 12/26/2022]
Abstract
As the complexity of targeted molecules increases in modern organic synthesis, chemoselectivity is recognized as an important factor in the development of new methodologies. Chemoselective nucleophilic addition to amide carbonyl centers is a challenge because classical methods require harsh reaction conditions to overcome the poor electrophilicity of the amide carbonyl group. We have successfully developed a reductive nucleophilic addition of mild nucleophiles to tertiary amides, secondary amides, and N-methoxyamides that uses the Schwartz reagent [Cp2 ZrHCl]. The reaction took place in a highly chemoselective fashion in the presence of a variety of sensitive functional groups, such as methyl esters, which conventionally require protection prior to nucleophilic addition. The reaction will be applicable to the concise synthesis of complex natural alkaloids from readily available amide groups.
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Affiliation(s)
- Minami Nakajima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan), Fax: (+81) 45-566-1551
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26
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Li Y, Gao L, Zhu H, Li G, Chen Z. Silver triflate and triflic anhydride-promoted expedient synthesis of acylated 1-aminoisoquinolines. Org Biomol Chem 2014; 12:6982-5. [PMID: 25111030 DOI: 10.1039/c4ob01301h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical and convergent synthesis of biologically active 1-(N-acyl)-1-aminoisoquinolines from the reaction of 2-alkynylbenzaldoximes with amides has been realized. The readily available amides could be activated with triflic anhydride (Tf2O) and could efficiently participate in the domino reaction of 2-alkynylbenzaldoximes when catalyzed by AgOTf, thus providing various acylated 1-aminoisoquinolines with up to 98% yields.
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Affiliation(s)
- Yuewen Li
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education and Key Laboratory of Green Chemistry of Jiangxi Province, College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
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27
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Yoritate M, Meguro T, Matsuo N, Shirokane K, Sato T, Chida N. Two-step Synthesis of Multi-Substituted Amines by Using anN-Methoxy Group as a Reactivity Control Element. Chemistry 2014; 20:8210-6. [DOI: 10.1002/chem.201402231] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Indexed: 11/09/2022]
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28
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29
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Arpin P, Hill B, Larouche-Gauthier R, Spino C. Prins cyclization of α-bromoethers under basic conditions. CAN J CHEM 2013. [DOI: 10.1139/cjc-2013-0337] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
α-Bromoethers have been found to undergo Prins-type cyclization under basic conditions and without the need to add a promoter. The products are those derived from a Markovnikov addition on the pendant alkene. However, the stereochemistry and even the structure of the products sometimes differ from those expected with the classical Lewis-acid-catalyzed Prins reaction of acetals.
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Affiliation(s)
- Patrice Arpin
- Département de chimie, Université de Sherbrooke, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Bryan Hill
- Département de chimie, Université de Sherbrooke, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Robin Larouche-Gauthier
- Département de chimie, Université de Sherbrooke, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
| | - Claude Spino
- Département de chimie, Université de Sherbrooke, 2500 boul. Université, Sherbrooke, QC J1K 2R1, Canada
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30
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Shirokane K, Wada T, Yoritate M, Minamikawa R, Takayama N, Sato T, Chida N. Total Synthesis of (±)-Gephyrotoxin by Amide-Selective Reductive Nucleophilic Addition. Angew Chem Int Ed Engl 2013; 53:512-6. [DOI: 10.1002/anie.201308905] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Indexed: 11/08/2022]
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31
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Shirokane K, Wada T, Yoritate M, Minamikawa R, Takayama N, Sato T, Chida N. Total Synthesis of (±)-Gephyrotoxin by Amide-Selective Reductive Nucleophilic Addition. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201308905] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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32
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Jäkel M, Qu J, Schnitzer T, Helmchen G. Addition of Organometallic Reagents to ChiralN‐Methoxylactams: Enantioselective Syntheses of Pyrrolidines and Piperidines. Chemistry 2013; 19:16746-55. [DOI: 10.1002/chem.201302735] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Mascha Jäkel
- Organisch‐Chemisches Institut, Ruprecht‐Karls‐Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221‐544205
| | - Jianping Qu
- Organisch‐Chemisches Institut, Ruprecht‐Karls‐Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221‐544205
| | - Tobias Schnitzer
- Organisch‐Chemisches Institut, Ruprecht‐Karls‐Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221‐544205
| | - Günter Helmchen
- Organisch‐Chemisches Institut, Ruprecht‐Karls‐Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221‐544205
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33
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Gao Y, Huang Z, Zhuang R, Xu J, Zhang P, Tang G, Zhao Y. Direct transformation of amides into α-amino phosphonates via a reductive phosphination process. Org Lett 2013; 15:4214-7. [PMID: 23909613 DOI: 10.1021/ol4019419] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first general method for the reductive phosphination of amides in one pot has been developed. The reactions described provide a novel access to α-amino phosphonates in good to excellent yields, cover a broad scope of substrates such as secondary and tertiary amides, and do not require a low temperature.
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Affiliation(s)
- Yuzhen Gao
- Department of Chemistry, College of Chemistry and Chemical Engineering, and the Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen, Fujian 361005, China
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34
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Chou SSP, Huang JL. Studies toward the first stereoselective total synthesis of (±)-quinolizidine 195C and other transformations. Molecules 2013; 18:8243-56. [PMID: 23857127 PMCID: PMC6269906 DOI: 10.3390/molecules18078243] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/02/2013] [Accepted: 07/03/2013] [Indexed: 11/16/2022] Open
Abstract
Starting from a thio-substituted 4-quinolizidinone, a series of C-6 alkylated derivatives with a trans C-6, C-9a relationship was synthesized. Further transformations led to the first stereoselective total synthesis of the structure proposed for (±)-quinolizidine 195C, the major alkaloid isolated from the skin extracts of the Madagascan frog Mantella betsileo. Since the spectral data of the synthetic and natural products differed significantly, the true structure of (±)-quinolizidine 195C remains uncertain.
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Affiliation(s)
- Shang-Shing P Chou
- Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.
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35
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Inamoto Y, Kaga Y, Nishimoto Y, Yasuda M, Baba A. Indium Triiodide Catalyzed Reductive Functionalization of Amides via the Single-Stage Treatment of Hydrosilanes and Organosilicon Nucleophiles. Org Lett 2013; 15:3452-5. [DOI: 10.1021/ol4015317] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshihiro Inamoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yuta Kaga
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yoshihiro Nishimoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Makoto Yasuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Akio Baba
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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36
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37
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Narendraprasad Reddy B, Ramana CV. A modular total synthesis of (±)-trigonoliimine C. Chem Commun (Camb) 2013; 49:9767-9. [DOI: 10.1039/c3cc45512b] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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38
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Yanagita Y, Nakamura H, Shirokane K, Kurosaki Y, Sato T, Chida N. Direct nucleophilic addition to N-alkoxyamides. Chemistry 2012; 19:678-84. [PMID: 23165728 DOI: 10.1002/chem.201202639] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 10/02/2012] [Indexed: 11/06/2022]
Abstract
While the synthesis of amide bonds is now one of the most reliable organic reactions, functionalization of amide carbonyl groups has been a long-standing issue due to their high stability. As an ongoing program aimed at practical transformation of amides, we developed a direct nucleophilic addition to N-alkoxyamides to access multisubstituted amines. The reaction enabled installation of two different functional groups to amide carbonyl groups in one pot. The N-alkoxy group played important roles in this reaction. First, it removed the requirement for an extra preactivation step prior to nucleophilic addition to activate inert amide carbonyl groups. Second, the N-alkoxy group formed a five-membered chelated complex after the first nucleophilic addition, resulting in suppression of an extra addition of the first nucleophile. While diisobutylaluminum hydride (DIBAL-H) and organolithium reagents were suitable as the first nucleophile, allylation, cyanation, and vinylation were possible in the second addition including inter- and intramolecular reactions. The yields were generally high, even in the synthesis of sterically hindered α-trisubstituted amines. The reaction exhibited wide substrate scope, including acyclic amides, five- and six-membered lactams, and macrolactams.
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Affiliation(s)
- Yuta Yanagita
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Yokohama 223-8522, Japan
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39
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Xiao KJ, Wang AE, Huang PQ. Direct Transformation of Secondary Amides into Secondary Amines: Triflic Anhydride Activated Reductive Alkylation. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204098] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Xiao KJ, Wang AE, Huang PQ. Direct transformation of secondary amides into secondary amines: triflic anhydride activated reductive alkylation. Angew Chem Int Ed Engl 2012; 51:8314-7. [PMID: 22807195 DOI: 10.1002/anie.201204098] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Kai-Jiong Xiao
- Department of Chemistry and Fujian Provincial Key Laboratory for Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P.R. China
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41
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Bélanger G, Dupuis M, Larouche-Gauthier R. Asymmetric total synthesis of (+)-virosine A via sequential nucleophilic cyclizations onto an activated formamide. J Org Chem 2012; 77:3215-21. [PMID: 22390172 DOI: 10.1021/jo202651t] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first synthesis of tetracyclic alkaloid virosine A is reported. The natural alkaloid was prepared in only 13 steps, in an enantioenriched form. The azabicyclo[2.2.2]octane core was efficiently assembled using a key Vilsmeier-Haack and Mannich cyclizations sequence performed in one pot.
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Affiliation(s)
- Guillaume Bélanger
- Département de Chimie, Université de Sherbrooke, 2500 boulevard Université, Sherbrooke, Québec J1K 2R1, Canada.
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42
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Oda Y, Sato T, Chida N. Direct Chemoselective Allylation of Inert Amide Carbonyls. Org Lett 2012; 14:950-3. [DOI: 10.1021/ol3000316] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yukiko Oda
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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43
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Pansare SV, Dyapa R. Enantioselective approach to functionalized quinolizidines: synthesis of (+)-julandine and (+)-cryptopleurine. Org Biomol Chem 2012; 10:6776-84. [DOI: 10.1039/c2ob25689d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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