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Transition-metal clusters as catalysts for chemoselective transesterification of alcohols in the presence of amines
| Content Provider | Scilit |
|---|---|
| Author | Mashima, Kazushi Hayashi, Yukiko Agura, Kazushi Ohshima, Takashi |
| Copyright Year | 2014 |
| Abstract | Acylation is one of the most abundant organic transformations of alcohols (esterification) and amines (amidation). Because of the greater nucleophilicity of the amino group compared to the hydroxyl group and the stability of amides compared to esters, N-acylation occurs predominantly in organic synthetic reactions. We reported that the μ-oxo-tetranuclear zinc cluster Zn4(OCOCF3)6O efficiently catalyzes highly chemoselective acylation of hydroxyl groups in the presence of primary and secondary alkyl amino groups to afford the corresponding esters in high yields. Not only zinc carboxylate complexes but also various carboxylate complexes of first-row late transition metals, such as Mn, Fe, Co, and Cu, become catalysts for such the hydroxy group-selective acylation in the presence of amines. Among these carboxylate compounds, we found that the combination of an octanuclear cobalt carboxylate cluster [Co4(OCOR)6O]2 (R = CF3, CH3, and tBu) with nitrogen-containing ligands such as 2,2′-bipyridine show sufficient catalytic activity toward O-selective transesterification. Notably, an alkoxide-bridged dinuclear complex, Co2(OCOtBu)2(bpy)2(μ2-OCH2-C6H4-4-CH3)2, was successfully isolated as a key intermediate that proceeds with Michaelis–Menten behavior through an ordered ternary complex mechanism similar to dinuclear metallo-enzymes, suggesting that the formation of alkoxides, followed by coordination of the ester, is responsible for the unique O-selective acylation. |
| Related Links | http://www.degruyter.com/downloadpdf/j/pac.2014.86.issue-3/pac-2014-5036/pac-2014-5036.xml |
| Ending Page | 343 |
| Page Count | 9 |
| Starting Page | 335 |
| ISSN | 00334545 |
| e-ISSN | 13653075 |
| DOI | 10.1515/pac-2014-5036 |
| Journal | Pure and Applied Chemistry |
| Issue Number | 3 |
| Volume Number | 86 |
| Language | English |
| Publisher | Walter de Gruyter GmbH |
| Publisher Date | 2014-03-04 |
| Access Restriction | Open |
| Subject Keyword | Pure and Applied Chemistry Inorganic Chemistry Acylation Catalysts Chemoselectivity Clusters Cobalt Omcos-17 Zinc Journal: Pure and Applied Chemistry, Vol- 86 |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
