Oxidative or metal-mediated cyclization approaches to carbocycles and heterocycles
A method for preparation of bicyclic aromatic orthoesters from the corresponding aldehydes via DDQ-mediated oxidative cyclization is described in chapter 1 of the thesis, the intermediate in our method is similar as the one which is impossible to be generated from carboxylate acid derivatives and al...
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| Main Author: | |
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| Other Authors: | |
| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2015
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| Online Access: | https://hdl.handle.net/10356/62199 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A method for preparation of bicyclic aromatic orthoesters from the corresponding aldehydes via DDQ-mediated oxidative cyclization is described in chapter 1 of the thesis, the intermediate in our method is similar as the one which is impossible to be generated from carboxylate acid derivatives and alcohols directly. In chapter 2, a new strategy for the aromatic C–H bond functionalization is described. α-Tetralone could be oxidatively synthesized from the corresponding acylsilane with ethyl iodoacetate. Direct acylation of aromatic ring with acylsilane was achieved in the absence of strong Lewis acid or transition-metal. Finally, a W(CO)6-mediated intramolecular cyclization reaction from o-alkynylphenyl derivatives to afford 7-membered nitrogen-containing heterocyclic compounds 3,1-benzoxazepines is depicted. This method provided us a simple way to construct 7-membered heterocycles efficiently and regioselectively. |
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