Carbene-catalyzed enantioselective carbon-heteroatom bond (C-N, C-P, C-S) construction
N-Heterocyclic carbene (NHC) has emerged as one of the crucial synthetic tools for asymmetric transformations of readily available materials into complex moieties. Particularly, a great deal of success has been achieved on the front of enantioselective carbon-carbon bond formation. However, in sharp...
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| 格式: | Thesis-Doctor of Philosophy |
| 語言: | English |
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Nanyang Technological University
2021
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| 在線閱讀: | https://hdl.handle.net/10356/151852 |
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| 機構: | Nanyang Technological University |
| 語言: | English |
| 總結: | N-Heterocyclic carbene (NHC) has emerged as one of the crucial synthetic tools for asymmetric transformations of readily available materials into complex moieties. Particularly, a great deal of success has been achieved on the front of enantioselective carbon-carbon bond formation. However, in sharp contrast, NHC-mediated asymmetric carbon-heteroatom bond (C-X) construction was seldomly explored. In this thesis, three novel NHC-catalyzed strategies have been developed to access C-N, C-P, and C-S bonds asymmetrically. Firstly, utilization of the NHC-bound unsaturated acyl azolium intermediate has been demonstrated to access dihydropyrimidinone scaffold (C-N bond formation) and carbon-centered chiral tertiary phosphine (C-P bond formation). In the last part, rarely explored NHC-bound alkynyl acyl azolium intermediate has been discussed and applied to obtain atroposelective axially chiral sulfone-bearing styrene derivatives (C-S bond formation). |
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