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Hsueh NC, Lai KS, Chang MY. Stereocontrolled Construction of 1-Vinylindanes via Intramolecular Cyclization of o-Cinnamyl Chalcones. J Org Chem 2018; 83:11415-11424. [PMID: 30122047 DOI: 10.1021/acs.joc.8b01729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this paper, a concise route for the synthesis of 1-vinylindanes is described, including (i) NaBH4-mediated reduction of o-cinnamyl chalcones and (ii) sequential BF3·OEt2-mediated intramolecular annulation of the resulting alkenols. The plausible mechanism is proposed and discussed herein. This protocol provides highly effective stereocontrolled cinnamyl-enone cross-coupling to construct three contiguous trans- trans stereocenters and one ( E)-configured alkenyl or styryl group.
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Affiliation(s)
- Nein-Chen Hsueh
- Department of Medicinal and Applied Chemistry , Kaohsiung Medical University , Kaohsiung 807 , Taiwan
| | - Kai-Shang Lai
- Department of Medicinal and Applied Chemistry , Kaohsiung Medical University , Kaohsiung 807 , Taiwan
| | - Meng-Yang Chang
- Department of Medicinal and Applied Chemistry , Kaohsiung Medical University , Kaohsiung 807 , Taiwan.,Department of Medical Research , Kaohsiung Medical University Hospital , Kaohsiung 807 , Taiwan
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Abstract
A synthetic route to derive the skeleton of naphthalenes starting with isovanillin is described with modest total yields via the key transformation of metal triflate-mediated intramolecular benzannulation of o-formyl or o-benzoyl allylbenzenes in MeNO2 at rt.
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Affiliation(s)
- Chieh-Kai Chan
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Heui-Sin Wang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Yu-Lin Tsai
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Meng-Yang Chang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
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Chan CK, Tsai YL, Chan YL, Chang MY. Synthesis of Substituted 2,3-Benzodiazepines. J Org Chem 2016; 81:9836-9847. [DOI: 10.1021/acs.joc.6b01935] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Chieh-Kai Chan
- Department of Medicinal and Applied Chemistry and General Research Centers of R&D Office, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yu-Lin Tsai
- Department of Medicinal and Applied Chemistry and General Research Centers of R&D Office, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yi-Ling Chan
- Department of Medicinal and Applied Chemistry and General Research Centers of R&D Office, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Meng-Yang Chang
- Department of Medicinal and Applied Chemistry and General Research Centers of R&D Office, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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van Loon AA, Holton MK, Downey C, White TM, Rolph CE, Bruening SR, Li G, Delaney KM, Pelkey SJ, Pelkey ET. Preparation of dibenzo[e,g]isoindol-1-ones via Scholl-type oxidative cyclization reactions. J Org Chem 2014; 79:8049-58. [PMID: 25138638 PMCID: PMC4156242 DOI: 10.1021/jo501185f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Indexed: 01/08/2023]
Abstract
A flexible synthesis of dibenzo[e,g]isoindol-1-ones has been developed. Dibenzo[e,g]isoindol-1-ones represent simplified benzenoid analogues of biological indolo[2,3-a]pyrrolo[3,4-c]carbazol-5-ones (indolocarbazoles), compounds that have demonstrated a wide range of biological activity. The synthesis of the title compounds involved tetramic acid sulfonates. Different aryl groups were introduced at C4 of the heterocyclic ring via Suzuki-Miyaura cross-coupling reactions. Finally, mild Scholl-type oxidative cyclizations mediated by phenyliodine(III) bis(trifluoroacetate) (PIFA) converted some of the latter compounds into the corresponding dibenzo[e,g]isoindol-1-ones. A systematic study of the oxidative cyclization revealed the following reactivity trend: 3,4-dimethoxyphenyl ≫ 3-methoxyphenyl > 3,4,5-trimethoxyphenyl > 4-methoxyphenyl ≈ phenyl. Overall, the oxidative cyclization required at least two methoxy groups distributed in the aromatic rings, at least one of which had to be located para to the site of the cyclization.
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Affiliation(s)
- Amy A. van Loon
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Maeve K. Holton
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Catherine
R. Downey
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Taryn M. White
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Carly E. Rolph
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Stephen R. Bruening
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Guanqun Li
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Katherine M. Delaney
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Sarah J. Pelkey
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
| | - Erin T. Pelkey
- Department of Chemistry, Hobart and William
Smith Colleges, Geneva, New York 14456, United
States
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Chang MY, Chan CK, Lin SY. One-pot access to 2-naphthols and benzofurans via the aerobic Wacker-type oxidation/intramolecular aldol cyclization. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.12.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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