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Han L, Lv K, Wang T, Meng Z, Zhang J, Liu T. Mechanistic Insight into Palladium/Brønsted Acid Catalyzed Methoxycarbonylation and Hydromethoxylation of Internal Alkene: A Computational Study. Inorg Chem 2023; 62:3904-3915. [PMID: 36799526 DOI: 10.1021/acs.inorgchem.2c04291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Density functional theory (DFT) calculations were performed to study the palladium/Brønsted acid-catalyzed methoxycarbonylation and hydromethoxylation reactions of internal alkene. The calculated results show that the pyridyl group (N atom) in bidentate phosphine ligand with built-in base (L1) plays a crucial role in controlling the selectivity. With the help of the pyridyl group, the methanolysis steps in the methoxycarbonylation reaction and the hydromethoxylation reaction become easy, and both the linear ester methyl 3,4-dimethylpentanoate (P1) and the hydromethoxylation product 2-methoxy-2,3-dimethylbutane (P2) could be obtained. In contrast, the possibility of leading to branched ester P1' was ruled out according to our calculations. The steric effect could account for the observed selectivity. In the presence of the DPEphos ligand (L2) that does not bear the pyridyl group, the methanolysis step in the methoxycarbonylation reaction becomes the rate-determining step with a high overall energy barrier. Neither linear nor branched methoxycarbonylation product could be generated. The palladium/Brønsted acid co-catalyzed hydromethoxylation also become difficult without the assistance of the pyridyl group in the presence of the L2 ligand. Instead, TsOH-catalyzed hydromethoxylation reaction could take place to generate the ether product P2.
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Affiliation(s)
- Lingli Han
- School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, 273155 Shandong, China.,School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China
| | - Kang Lv
- School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, 273155 Shandong, China
| | - Teng Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China
| | - Zitong Meng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China
| | - Jing Zhang
- School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, 273155 Shandong, China.,School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China
| | - Tao Liu
- School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, 273155 Shandong, China.,School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165 Shandong, China
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Das A, Waser J. Pd-catalyzed functionalization of alkenes and alkynes using removable tethers. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ma R, Chen Y, Fang S, Jiang H, Yang S, Wu W. Palladium-catalyzed acetalization/cyclization of enynones with alcohols: rapid access to functionalized dihaloalkenyl dihydrofurans. Chem Commun (Camb) 2022; 58:13907-13910. [DOI: 10.1039/d2cc03949d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel Pd-catalyzed acetalization/cyclization of enynones and alcohols for the construction of dihaloalkenyl dihydrofuran derivatives is described.
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Affiliation(s)
- Ruize Ma
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
| | - Yang Chen
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
| | - Songjia Fang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
| | - Shaorong Yang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
| | - Wanqing Wu
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
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