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Ponomarev AV, Danilkina NA, Okuneva JS, Vidyakina AA, Khmelevskaya EA, Bunev AS, Rumyantsev AM, Govdi AI, Suarez T, Alabugin IV, Balova IA. Facile synthesis of diiodoheteroindenes and understanding their Sonogashira cross-coupling selectivity for the construction of unsymmetrical enediynes. Org Biomol Chem 2024; 22:4096-4107. [PMID: 38695707 DOI: 10.1039/d4ob00530a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
Electrophile-promoted cyclizations of functionalized alkynes offer a useful tool for constructing halogen-substituted heterocycles primed for further derivatization. Preinstallation of an iodo-substituent at the alkyne prior to iodo-cyclization opens access to ortho di-iodinated heterocyclic precursors for the preparation of unsymmetrical heterocycle-fused enediynes. This general approach was used to prepare 2,3-diiodobenzothiophene, 2,3-diiodoindole, and 2,3-diiodobenzofuran, a useful family of substrates for systematic studies of the role of heteroatoms on the regioselectivity of cross-coupling reactions. Diiodobenzothiophene showed much higher regioselectivity for Sonogashira cross-coupling at C2 than diiodoindole and diiodobenzofuran. As a result, benzothiophene can be conveniently involved in a one-pot sequential coupling with two different alkynes, yielding unsymmetrical benzothiophene-fused enediynes. On the other hand, the Sonogashira reaction of diiodoindole and diiodobenzofuran formed considerable amounts of di-substituted enediynes in addition to the monoalkyne product by coupling at C2. Interestingly, no C3-monocoupling products were observed for all of the diiodides, suggesting that the incorporation of the 1st alkyne at C2 activates the C3 position for the 2nd coupling. Additional factors affecting regioselectivity were detected, discussed and connected, through computational analysis, to transmetalation being the rate-determining step for the Sonogashira reaction. Several enediynes synthesized showed cytotoxic activity, which is not associated with DNA strand breaks typical of natural enediyne antibiotics.
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Affiliation(s)
- Alexander V Ponomarev
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Natalia A Danilkina
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Julia S Okuneva
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Aleksandra A Vidyakina
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Ekaterina A Khmelevskaya
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Alexander S Bunev
- Medicinal Chemistry Center, Tolyatti State University, 445020 Tolyatti, Russia
| | - Andrey M Rumyantsev
- Department of Genetics and Biotechnology, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia
| | - Anastasia I Govdi
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
| | - Thomas Suarez
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Irina A Balova
- Institute of Chemistry, Saint Petersburg State University (SPbU), Saint Petersburg, 199034, Russia.
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Kikuchi J, Maesaki K, Sasaki S, Wang W, Ito S, Yoshikai N. Stereoselective Synthesis of β-Alkoxy-β-amido Vinylbenziodoxoles via Iodo(III)etherification of Ynamides. Org Lett 2022; 24:6914-6918. [PMID: 36125122 DOI: 10.1021/acs.orglett.2c02570] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A trans-iodo(III)etherification reaction of ynamides with benziodoxole triflate and alcohols is reported. Despite the sensitivity of ynamides and enamides toward Brønsted acid, the reaction could be successfully performed under carefully controlled conditions to afford β-alkoxy-β-amido vinylbenziodoxoles in moderate to good yields. The products could be subjected to a sequence of cross-coupling via C-I(III) bond cleavage and electrophilic halogenation of the resulting α-alkoxyenamides, allowing for the preparation of densely functionalized esters.
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Affiliation(s)
- Jun Kikuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kaito Maesaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Shuma Sasaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Weifan Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Naohiko Yoshikai
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Okitsu T, Itoh M, Inui A, Muta E, Nakamoto R, Adachi Y, Wada A, Hatano M. Rapid Synthesis of Polycyclic Aromatic Compounds by Iodocyclization of Ynamides. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200275] [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)
- Takashi Okitsu
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Maho Itoh
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Ayaka Inui
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Emiko Muta
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Ryota Nakamoto
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Yuta Adachi
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Akimori Wada
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
| | - Manabu Hatano
- Kobe Pharmaceutical University Higashinada Kobe 658-8558 Japan
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Su S, Yan Z, Ye X, Wang J, Li Y, He G. PhI(OAc) 2-mediated trifluoromethylthiolation/oxidative cyclization of ynamides. Org Biomol Chem 2021; 19:8746-8753. [PMID: 34569586 DOI: 10.1039/d1ob01642c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A PhI(OAc)2-mediated trifluoromethylthiolation/oxidative cyclization of ynamides with the Shen reagent has been established herein, providing a facile access to CF3S-substituted oxazolidine-2,4-diones bearing a quaternary carbon center in 38-85% yields with chemoselectivities of up to 99/1.
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Affiliation(s)
- Shixuan Su
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Zhipeng Yan
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Xingyuan Ye
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Jingyang Wang
- College of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Yuan Li
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Guangke He
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
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