|
1
|
Maeda C, Tanaka R, Higuchi N, Kiguchi S, Ema T. Synthesis of Isocoumarins via Light-Driven Carboxylative Cyclization Reaction of o-Ethynyl Aryl Bromides with CO 2. Chemistry 2025:e202500563. [PMID: 40322844 DOI: 10.1002/chem.202500563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2025] [Revised: 04/18/2025] [Accepted: 05/05/2025] [Indexed: 05/17/2025]
Abstract
Isocoumarins are an important class of bicyclic lactones, which are seen in natural products, drugs, and bioactive compounds, and a variety of synthetic methods for isocoumarins have been developed. However, the synthesis of isocoumarins via the catalytic CO2 fixation has been scarcely reported despite the potential incorporation of CO2 into the lactone moiety. Here, we developed the light-driven carboxylative cyclization reaction of o-ethynyl aryl bromides with CO2, which selectively produced isocoumarins. Control experiments revealed that photoirradiation promoted the cyclization process with high selectivity.
Collapse
Affiliation(s)
- Chihiro Maeda
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama, 700-8530, Japan
| | - Rio Tanaka
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama, 700-8530, Japan
| | - Nanaka Higuchi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama, 700-8530, Japan
| | - Shunsuke Kiguchi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama, 700-8530, Japan
| | - Tadashi Ema
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama, 700-8530, Japan
| |
Collapse
|
|
2
|
Guo W, Wu W, Wang X, Zhao X, Zhou H, Teng F, Hu W, Tao C, Hu H. Synthesis of Tetracyclic-Fused Dihydroindeno[2,1- b]chromenes via Palladium-Catalyzed Alkyne Insertion and C-H Bond Activation. J Org Chem 2025; 90:722-732. [PMID: 39722191 DOI: 10.1021/acs.joc.4c02658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2024]
Abstract
An unprecedented Pd-catalyzed cascade alkyne insertion/Heck/C-H activation reaction of o-iodophenyl alkenyl ethers and diarylacetylenes has been developed. Diversified tetracyclic-fused dihydroindeno[2,1-b]chromenes bearing a quaternary center were constructed in an efficient, straightforward, and atom-economic way with good to excellent yields. The protocol features high bonding efficiency, operational simplicity, broad substrate scope, and easy scale-up.
Collapse
Affiliation(s)
- Wenting Guo
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Wenting Wu
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Xumeng Wang
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Xinhui Zhao
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Hualan Zhou
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Fan Teng
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, People's Republic of China
| | - Weiming Hu
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Chuanzhou Tao
- Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
| | - Huayou Hu
- Jiangsu Key Laboratory for Chemistry of Low Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian 223300, China
| |
Collapse
|
|
3
|
Abstract
A silver-catalyzed carbon dioxide fixation reaction into 2-alkynylindole derivatives was developed to afford tricyclic indoles. Carbon dioxide was selectively fixed on the N atom of the indole, and only 6-endo-dig cyclization proceeded under mild reaction conditions. Carboxylation on C3 of the indole was not observed. This method was applicable for a variety of 2-alkynylindoles, and the corresponding products were obtained in high yields without the production of side products.
Collapse
Affiliation(s)
- Seiya Uema
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kodai Saito
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Tohru Yamada
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| |
Collapse
|
|
4
|
Takaishi K, Kosugi H, Nishimura R, Yamada Y, Ema T. C-Methylenation of anilines and indoles with CO 2 and hydrosilane using a pentanuclear zinc complex catalyst. Chem Commun (Camb) 2021; 57:8083-8086. [PMID: 34302161 DOI: 10.1039/d1cc03675k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The one-step C-methylenation of anilines and indoles with CO2 and phenylsilane was catalyzed by a pentanuclear ZnII complex to give diarylmethanes via geminal C-H and C-C bond formation. It is proposed that the zinc-hydride complex generated in situ is a catalytically active species and that bis(silyl)acetal is a key intermediate. When aniline was used as a substrate, both the C-methylenation and N-methylation proceeded.
Collapse
Affiliation(s)
- Kazuto Takaishi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
| | - Hiroyasu Kosugi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
| | - Ritsuki Nishimura
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
| | - Yuya Yamada
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
| | - Tadashi Ema
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
| |
Collapse
|