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Inokuma T, Iritani K, Takahara Y, Sun C, Yamaoka Y, Kuwano S, Yamada KI. Remote electronic effect on the N-heterocyclic carbene-catalyzed asymmetric intramolecular Stetter reaction and structural revision of products. Chem Commun (Camb) 2023; 59:5375-5378. [PMID: 36939087 DOI: 10.1039/d3cc00693j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
The remote electronic effects of chiral N-heterocyclic carbene catalysts on the asymmetric intramolecular Stetter reaction are investigated. The reaction rate and enantioselectivity were markedly influenced by a substituent at a remote position of the catalyst. The absolute configurations of the products are revised on the basis of X-ray diffraction. Density-functional theory calculations rationalize the improvement of the enantioselectivity using an electron-deficient catalyst.
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Affiliation(s)
- Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Kohei Iritani
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yuki Takahara
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Chunzhao Sun
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Satoru Kuwano
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
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Szabó Z, Paczal A, Kovács T, Mándi A, Kotschy A, Kurtán T. Synthesis and Vibrational Circular Dichroism Analysis of N-Heterocyclic Carbene Precursors Containing Remote Chirality Centers. Int J Mol Sci 2022; 23:ijms23073471. [PMID: 35408831 PMCID: PMC8999040 DOI: 10.3390/ijms23073471] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/17/2022] [Accepted: 03/18/2022] [Indexed: 01/01/2023] Open
Abstract
VCD analysis of 16 diastereomeric pairs of NHC precursors containing two isolated chirality centers and different substitution patterns identified VCD transitions characteristic of the chirality center in the imidazolium ring or in the side chain, which, in contrast to ECD and OR, could be utilized to assign the two chirality centers separately by simple comparison, regardless of the type and position of achiral aromatic substituents. While the ECD and OR data showed great dependence on the position of an achiral substituent such as a methoxy group, characteristic experimental VCD transitions remained consistent and they could be used to determine the absolute configuration of all the regio- and stereoisomers and substituted analogues. VCD, ECD and OR approaches were evaluated, and several carbene precursors were found, for which only the VCD method could distinguish the four stereoisomers. With t-butyl, phenyl or 2-naphthyl substituents at the C-1′ chirality center, the ECD spectra of the C-1′ epimers were near-identical, and hence it was only the VCD approach that showed distinct differences suitable for the configurational assignment. The chiroptical characterization of our diastereomeric pairs of NHC precursors enables the future application of related derivatives having different substitution patterns in stereoselective transformations.
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Affiliation(s)
- Zita Szabó
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
| | - Attila Paczal
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
| | - Tibor Kovács
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
| | - Andras Kotschy
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
- Correspondence: (A.K.); (T.K.)
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
- Correspondence: (A.K.); (T.K.)
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Wang L, Jiang M, Shi MQ. Copper-catalyzed synthesis of CN-containing chroman-4-ones via intramolecular radical cascade acyl-cyanation reaction. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Szabo Z, Timari M, Kassai R, Szokol B, Benyei AC, Gáti T, Paczal A, Kotschy A. Modular Synthesis of Chiral NHC Precursors and Their Silver and Gold Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zita Szabo
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Matyas Timari
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Rudolf Kassai
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Bianka Szokol
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Attila C. Benyei
- Institute of Chemistry, University of Debrecen, Egyetem ter 1., H-4032 Debrecen, Hungary
| | - Tamás Gáti
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Attila Paczal
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
| | - Andras Kotschy
- Servier Research Institute of Medicinal Chemistry, Zahony u 7., H-1031 Budapest, Hungary
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Charvieux A, Duc Vu N, Duguet N, Lemaire M. Valorization of Methyl Azelaaldehydate - A Vegetable Oil Based Platform Molecule for the Synthesis of Monomers through Stetter Reaction. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Aubin Charvieux
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Nam Duc Vu
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Nicolas Duguet
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Marc Lemaire
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
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Selvakumar S, Kang QK, Arumugam N, Almansour AI, Kumar RS, Maruoka K. Hypervalent iodine(III) catalyzed radical hydroacylation of chiral alkylidenemalonates with aliphatic aldehydes under photolysis. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.08.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Selvakumar S, Sakamoto R, Maruoka K. Diastereoselective Radical Hydroacylation of Alkylidenemalonates with Aliphatic Aldehydes Initiated by Photolysis of Hypervalent Iodine(III) Reagents. Chemistry 2016; 22:6552-5. [PMID: 27097595 DOI: 10.1002/chem.201600425] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Indexed: 01/20/2023]
Abstract
Diastereoselective radical hydroacylation of chiral alkylidenemalonates with aliphatic aldehydes is realized by the combination of a hypervalent iodine(III) reagent and UV-light irradiation. The reaction is initiated by the photolysis of hypervalent iodine(III) reagents under mild, metal-free conditions, and is the first example of diastereoselective addition of acyl radicals to olefins to afford chiral ketones in a highly stereoselective fashion. The obtained optically active ketones are useful chiral synthons, as exemplified by the short formal synthesis of (-)-methyleneolactocin.
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Affiliation(s)
- Sermadurai Selvakumar
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041
| | - Ryu Sakamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041.
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Hapău D, Rémond E, Fanelli R, Vivancos M, René A, Côté J, Besserer-Offroy É, Longpré JM, Martinez J, Zaharia V, Sarret P, Cavelier F. Stereoselective Synthesis of β-(5-Arylthiazolyl) α-Amino Acids and Use in Neurotensin Analogues. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501495] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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