1
|
Halaczkiewicz M, Maraj A, Kelm H, Manolikakes G. Brønsted Acid-Catalyzed Diastereoselective Synthesis of Spiroisoindolinones from Enamides. Org Lett 2024; 26:2321-2325. [PMID: 38467018 DOI: 10.1021/acs.orglett.4c00661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
A highly diastereoselective synthesis of spiroisoindolinones from enamides and 3-hydroxy-isoindolinones is reported. The reaction proceeds rapidly in the presence of p-toluenesulfonic acid as a Brønsted acid catalyst and affords a variety of densely substituted spiroisoindolinones with three contiguous stereogenic centers in high yields (≤98%) and diastereoselectivities (up to dr >98:<2:0:0).
Collapse
Affiliation(s)
- Miro Halaczkiewicz
- Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Arianit Maraj
- Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Harald Kelm
- Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Georg Manolikakes
- Department of Chemistry, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| |
Collapse
|
2
|
Zhang Y, Wu J, Qiu W, Liao L, Wang B, Zhao X. Lewis Acid-Mediated Electrophilic Thiolative Difunctionalization of Enimides: Rapid Access to β-Amino Sulfides. Org Lett 2023. [PMID: 37384740 DOI: 10.1021/acs.orglett.3c01999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
An efficient and practical route for the synthesis of β-amino sulfides by Lewis acid-mediated electrophilic thiolative difunctionalization of enimides is disclosed. A series of free phenols, electron-rich arene, alcohol, azide, and hydride, are successfully incorporated into the substrates in high regio- and stereoselectivities under mild conditions. The obtained products possess multiple functional groups and can be easily transformed to other valuable molecules.
Collapse
Affiliation(s)
- Yuanyuan Zhang
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| | - Jiaping Wu
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| | - Wangzhen Qiu
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| | - Lihao Liao
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| | - Bo Wang
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| | - Xiaodan Zhao
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P. R. China
| |
Collapse
|
3
|
Krieg SC, Grimmer J, Pick AM, Kelm H, Breugst M, Manolikakes G. Stereoselective Synthesis of 2‐Oxyenamides. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200772] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sara-Cathrin Krieg
- TU Kaiserslautern: Technische Universitat Kaiserslautern Chemistry GERMANY
| | - Jennifer Grimmer
- TU Kaiserslautern: Technische Universitat Kaiserslautern Chemistry GERMANY
| | - Annika Maria Pick
- TU Kaiserslautern: Technische Universitat Kaiserslautern Chemistry GERMANY
| | - Harald Kelm
- TU Kaiserslautern: Technische Universitat Kaiserslautern Chemistry GERMANY
| | - Martin Breugst
- TU Chemnitz: Technische Universitat Chemnitz Chemistry GERMANY
| | - Georg Manolikakes
- TU Kaiserslautern fachbereich Chemie Erwin-schrödinger-Str. Geb 54 67663 Kaiserslautern GERMANY
| |
Collapse
|
4
|
Wang Y, Yang M, Lao C, Jiang Z. C-H bond cleavage-enabled aerobic ring-opening reaction of in situ formed 2-aminobenzofuran-3(2 H)-ones. Org Biomol Chem 2021; 19:9448-9459. [PMID: 34693412 DOI: 10.1039/d1ob01755a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A C-H bond cleavage-enabled aerobic ring-opening reaction of 2-aminobenzofuran-3(2H)-ones formed in situ by hemiacetals with a variety of amines is reported. This simple one-pot reaction provides an alternative approach to obtain o-hydroxyaryl glyoxylamides in excellent yields of up to 97%. Alkylamines react with hemiacetals via a catalyst-free dehydration condensation to generate 2-aminobenzofuran-3(2H)-ones. The in situ formed semicyclic N,O-acetals undergo the same amine-initiated C-H bond hydroxylation in air under mild conditions to afford ring-opening products. Similarly, arylamines were investigated as substrates for a two-step tandem process involving a DPP-catalyzed condensation followed by a Et2NH-mediated C-H hydroxylation. Unlike the previously reported functionalization of N,O-acetals via a C-O or C-N cleavage, the aerobic oxidative C-H hydroxylation in this reaction, which is promoted by using stoichiometric amounts of alkylamines as both a Lewis base and a reductant at room temperature under atmospheric air, proceeds via α-carbonyl-stabilized carbanion intermediates from the C-H cleavage of N,O-acetals.
Collapse
Affiliation(s)
- Yingwei Wang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China.
| | - Mingrong Yang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China.
| | - Chichou Lao
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China. .,Faculty of Chinese Medicine, Macau University of Science and Technology, Macau 999078, China
| | - Zhihong Jiang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China.
| |
Collapse
|
5
|
Krieg SC, Grimmer J, Kramer P, Bolte M, Kelm H, Manolikakes G. Oxyenamides as Versatile Building Blocks for a Highly Stereoselective One-Pot Synthesis of the 1,3-Diamino-2-ol-Scaffold Containing Three Continuous Stereocenters. Angew Chem Int Ed Engl 2021; 60:23667-23671. [PMID: 34463410 PMCID: PMC8597051 DOI: 10.1002/anie.202109752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/22/2021] [Indexed: 12/15/2022]
Abstract
A highly diastereoselective one-pot synthesis of the 1,3-diamino-2-alcohol unit bearing three continuous stereocenters is described. This method utilizes 2-oxyenamides as a novel type of building block for the rapid assembly of the 1,3-diamine scaffold containing an additional stereogenic oxygen functionality at the C2 position. A stereoselective preparation of the required (Z)-oxyenamides is reported as well.
Collapse
Affiliation(s)
- Sara-Cathrin Krieg
- Department of Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Jennifer Grimmer
- Department of Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Philipp Kramer
- Department of Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Michael Bolte
- Institute of Inorganic and Analytical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany
| | - Harald Kelm
- Department of Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Georg Manolikakes
- Department of Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| |
Collapse
|
6
|
Krieg S, Grimmer J, Kramer P, Bolte M, Kelm H, Manolikakes G. Oxyenamide als vielseitige Bausteine für eine hochgradig stereoselektive Eintopf‐Synthese der 1,3‐Diamino‐2‐ol‐Einheit mit drei fortlaufenden Stereozentren. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sara‐Cathrin Krieg
- Fachbereich Chemie Technische Universität Kaiserslautern Erwin-Schrödinger-Straße, Geb. 54 67663 Kaiserslautern Deutschland
| | - Jennifer Grimmer
- Fachbereich Chemie Technische Universität Kaiserslautern Erwin-Schrödinger-Straße, Geb. 54 67663 Kaiserslautern Deutschland
| | - Philipp Kramer
- Fachbereich Chemie Technische Universität Kaiserslautern Erwin-Schrödinger-Straße, Geb. 54 67663 Kaiserslautern Deutschland
| | - Michael Bolte
- Institut für Anorganische und Analytische Chemie Goethe Universität Frankfurt am Main Max-von-Laue-Straße 7 60438 Frankfurt am Main Deutschland
| | - Harald Kelm
- Fachbereich Chemie Technische Universität Kaiserslautern Erwin-Schrödinger-Straße, Geb. 54 67663 Kaiserslautern Deutschland
| | - Georg Manolikakes
- Fachbereich Chemie Technische Universität Kaiserslautern Erwin-Schrödinger-Straße, Geb. 54 67663 Kaiserslautern Deutschland
| |
Collapse
|
7
|
Kiyokawa K, Jou K, Minakata S. Intramolecular C-H Amination of N-Alkylsulfamides by tert-Butyl Hypoiodite or N-Iodosuccinimide. Chemistry 2021; 27:13971-13976. [PMID: 34403187 DOI: 10.1002/chem.202102635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Indexed: 01/15/2023]
Abstract
1,3-Diamines are an important class of compounds that are broadly found in natural products and are also widely used as building blocks in organic synthesis. Although the intramolecular C-H amination of N-alkylsulfamide derivatives is a reliable method for the construction of 1,3-diamine structures, the majority of these methods involve the use of a transition-metal catalyst. We herein report on a new transition-metal-free method using tert-butyl hypoiodite (t-BuOI) or N-iodosuccinimide (NIS), enabling secondary non-benzylic and tertiary C-H amination reactions to proceed. The cyclic sulfamide products can be easily transformed into 1,3-diamines. Mechanistic investigations revealed that amination reactions using t-BuOI or NIS each proceed via different pathways.
Collapse
Affiliation(s)
- Kensuke Kiyokawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan
| | - Keisuke Jou
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan
| | - Satoshi Minakata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan
| |
Collapse
|
8
|
Kramer P, Halaczkiewicz M, Sun Y, Kelm H, Manolikakes G. Iron(III)-Mediated Oxysulfonylation of Enamides with Sodium and Lithium Sulfinates. J Org Chem 2020; 85:3617-3637. [DOI: 10.1021/acs.joc.9b03299] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Philipp Kramer
- Institute for Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Miro Halaczkiewicz
- Institute for Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Yu Sun
- Institute for Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Harald Kelm
- Institute for Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| | - Georg Manolikakes
- Institute for Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67663 Kaiserslautern, Germany
| |
Collapse
|
9
|
Kramer P, Grimmer J, Bolte M, Manolikakes G. An Enamide-Based Domino Reaction for a Highly Stereoselective Synthesis of Tetrahydropyrans. Angew Chem Int Ed Engl 2019; 58:13056-13059. [PMID: 31298800 PMCID: PMC6772187 DOI: 10.1002/anie.201907565] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Indexed: 12/23/2022]
Abstract
A novel method for the highly stereoselective synthesis of tetrahydropyrans is reported. This domino reaction is based on a twofold addition of enamides to aldehydes followed by a subsequent cyclization and furnishes fully substituted tetrahydropyrans in high yields. Three new σ‐bonds and five continuous stereogenic centers are formed in this one‐pot process with a remarkable degree of diastereoselectivity. In most cases, the formation of only one out of 16 possible diastereomers is observed. Two different stereoisomers can be accessed in a controlled fashion starting either from an E‐ or a Z‐configured enamide.
Collapse
Affiliation(s)
- Philipp Kramer
- Department of Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Jennifer Grimmer
- Department of Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| | - Michael Bolte
- Department of Inorganic and Analytical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany
| | - Georg Manolikakes
- Department of Organic Chemistry, Technical University Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663, Kaiserslautern, Germany
| |
Collapse
|
10
|
Kramer P, Grimmer J, Bolte M, Manolikakes G. An Enamide‐Based Domino Reaction for a Highly Stereoselective Synthesis of Tetrahydropyrans. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907565] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Philipp Kramer
- Department of Organic Chemistry Technical University Kaiserslautern Erwin-Schrödinger-Strasse Geb. 54 67663 Kaiserslautern Germany
| | - Jennifer Grimmer
- Department of Organic Chemistry Technical University Kaiserslautern Erwin-Schrödinger-Strasse Geb. 54 67663 Kaiserslautern Germany
| | - Michael Bolte
- Department of Inorganic and Analytical Chemistry Goethe University Frankfurt am Main Max-von-Laue-Strasse 7 60438 Frankfurt am Main Germany
| | - Georg Manolikakes
- Department of Organic Chemistry Technical University Kaiserslautern Erwin-Schrödinger-Strasse Geb. 54 67663 Kaiserslautern Germany
| |
Collapse
|
11
|
Duhamel T, Martínez MD, Sideri IK, Muñiz K. 1,3-Diamine Formation from an Interrupted Hofmann–Löffler Reaction: Iodine Catalyst Turnover through Ritter-Type Amination. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01566] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas Duhamel
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 16 Avgda. Països Catalans, 43007 Tarragona, Spain
- Universidad de Oviedo, Julian Clavería, s/n, 33006 Oviedo, Spain
| | - Mario D. Martínez
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 16 Avgda. Països Catalans, 43007 Tarragona, Spain
| | - Ioanna K. Sideri
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 16 Avgda. Països Catalans, 43007 Tarragona, Spain
| | - Kilian Muñiz
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 16 Avgda. Països Catalans, 43007 Tarragona, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| |
Collapse
|
12
|
Marcantoni E, Palmieri A, Petrini M. Recent synthetic applications of α-amido sulfones as precursors of N-acylimino derivatives. Org Chem Front 2019. [DOI: 10.1039/c9qo00196d] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
α-Amido sulfones can be directly used as N-acylimine or N-acyliminium ion precursors in several synthetic processes aimed at the preparation of nitrogen containing compounds. This review collects the most relevant and practical utilizations of α-amido sulfones appeared in the literature after 2005.
Collapse
Affiliation(s)
- Enrico Marcantoni
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Alessandro Palmieri
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Marino Petrini
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| |
Collapse
|
13
|
Halli J, Kramer P, Grimmer J, Bolte M, Manolikakes G. Bi(OTf) 3-Catalyzed Diastereoselective One-Pot Synthesis of 1,3-Diamines with Three Continuous Stereogenic Centers. J Org Chem 2018; 83:12007-12022. [PMID: 30205002 DOI: 10.1021/acs.joc.8b01925] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly modular, diastereoselective one-pot-synthesis of 1,3-diamines with three contiguous stereogenic centers is reported. Our method provides a fast and efficient access to 1,2- anti-2,3- anti-1,3-diamines from three readily available building blocks. This Bi(OTf)3-catalyzed reaction is insensitive to air and moisture and can be performed on a multigram scale.
Collapse
Affiliation(s)
- Juliette Halli
- Institute for Organic Chemistry and Chemical Biology , Goethe University Frankfurt am Main , Max-von-Laue-Str. 7 , 60438 Frankfurt am Main , Germany
| | - Philipp Kramer
- Institute for Organic Chemistry , Technical University Kaiserslautern , Erwin-Schrödinger-Str. Geb. 54 , 67663 Kaiserslautern , Germany
| | - Jennifer Grimmer
- Institute for Organic Chemistry , Technical University Kaiserslautern , Erwin-Schrödinger-Str. Geb. 54 , 67663 Kaiserslautern , Germany
| | - Michael Bolte
- Institute for Inorganic and Analytical Chemistry , Goethe University Frankfurt am Main , Max-von-Laue-Str. 7 , 60438 Frankfurt am Main , Germany
| | - Georg Manolikakes
- Institute for Organic Chemistry , Technical University Kaiserslautern , Erwin-Schrödinger-Str. Geb. 54 , 67663 Kaiserslautern , Germany
| |
Collapse
|
14
|
Kramer P, Schönfeld J, Bolte M, Manolikakes G. Stereoselective One-Pot Synthesis of Dihydropyrimido[2,1-a]isoindole-6(2H)-ones. Org Lett 2018; 20:178-181. [PMID: 29278338 DOI: 10.1021/acs.orglett.7b03545] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereoselective one-pot synthesis of highly substituted dihydropyrimido[2,1-a]isoindole-6(2H)-ones containing three continuous stereocenters is reported. The reaction sequence is based on a hetero-Diels-Alder reaction between an enimide and a N-acylimine followed by an unprecedented Brønsted acid mediated rearrangement of an intermediate 5,6-dihydro-4H-1,3-oxazine to a pyrimido[2,1-a]isoindole.
Collapse
Affiliation(s)
- Philipp Kramer
- Department of Biochemistry, Chemistry and Pharmacy, Goethe-University , Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
| | - Julia Schönfeld
- Department of Biochemistry, Chemistry and Pharmacy, Goethe-University , Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
| | - Michael Bolte
- Department of Biochemistry, Chemistry and Pharmacy, Goethe-University , Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
| | - Georg Manolikakes
- Department of Biochemistry, Chemistry and Pharmacy, Goethe-University , Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
| |
Collapse
|
15
|
Sugiura M, Kashiwagi T, Ito M, Kotani S, Nakajima M. Stereoselective Synthesis of Nitrogen-Containing Compounds from Enamines. J Org Chem 2017; 82:10968-10979. [PMID: 28915033 DOI: 10.1021/acs.joc.7b01923] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The domino reaction of enamines, electrophiles (N-sulfonylimines, N-tosylisocyanate, or diethyl azodicarboxylate), and trichlorosilane provided trans-amines (trans/cis = > 99:1 to 96:4). Meanwhile, the sequential imino ene-type reaction of enamines and electrophiles/NaBH3CN reduction afforded cis-amines (trans/cis = 1:>99 to 15:85). The reversal of selectivity is discussed on the basis of diastereofacial selection of the plausible iminium ion intermediates. For the domino reaction of cyclic enamines and cyclic imines, high enantioselectivity (er = 95.7:4.3 to 99.9:0.1) was achieved by utilizing chiral Lewis base catalysts.
Collapse
Affiliation(s)
- Masaharu Sugiura
- Graduate School of Pharmaceutical Sciences and ‡Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Takeru Kashiwagi
- Graduate School of Pharmaceutical Sciences and ‡Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Mai Ito
- Graduate School of Pharmaceutical Sciences and ‡Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Shunsuke Kotani
- Graduate School of Pharmaceutical Sciences and ‡Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Makoto Nakajima
- Graduate School of Pharmaceutical Sciences and ‡Priority Organization for Innovation and Excellence, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| |
Collapse
|
16
|
Kramer P, Bolte M. Synthesis and crystal structures of two structurally related kryptoracemates. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017; 73:575-581. [PMID: 28677611 DOI: 10.1107/s2053229617009408] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 06/23/2017] [Indexed: 11/10/2022]
Abstract
Kryptoracemates are racemic compounds (pairs of enantiomers) that crystallize in Sohnke space groups (space groups that contain neither inversion centres nor mirror or glide planes nor rotoinversion axes). Thus, the two symmetry-independent molecules cannot be transformed into one another by any symmetry element present in the crystal structure. Usually, the conformation of the two enantiomers is rather similar if not identical. Sometimes, the two enantiomers are related by a pseudosymmetry element, which is often a pseudocentre of inversion, because inversion symmetry is thought to be favourable for crystal packing. We obtained crystals of two kryptoracemates of two very similar compounds differing in just one residue, namely rac-N-[(1S,2R,3S)-2-methyl-3-(5-methylfuran-2-yl)-1-phenyl-3-(pivalamido)propyl]benzamide, C27H32N2O3, (I), and rac-N-[(1S,2S,3R)-2-methyl-3-(5-methylfuran-2-yl)-1-phenyl-3-(propionamido)propyl]benzamide dichloromethane hemisolvate, C25H28N2O3·0.5CH2Cl2, (II). The crystals of both compounds contain both enantiomers of these chiral molecules. However, since the space groups [P212121 for (I) and P1 for (II)] contain neither inversion centres nor mirror or glide planes nor rotoinversion axes, there are both enantiomers in the asymmetric unit, which is a rather uncommon phenomenon. In addition, it is remarkable that (II) contains two pairs of enantiomers in the asymmetric unit. In the crystal, molecules are connected by intermolecular N-H...O hydrogen bonds to form chains or layered structures.
Collapse
Affiliation(s)
- Philipp Kramer
- Institut für Organische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/Main, Germany
| | - Michael Bolte
- Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/Main, Germany
| |
Collapse
|