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|Title:||Functionalization of aldehydes via N-heterocyclic carbene and base organic catalysts||Authors:||Yang, Ruojie||Keywords:||DRNTU::Science::Chemistry::Organic chemistry::Organic synthesis||Issue Date:||2014||Publisher:||Nanyang Technological University||Source:||Yang, R. (2014). Functionalization of aldehydes via n-heterocyclic carbene and base organic catalysts. Doctoral thesis, Nanyang Technological University, Singapore.||Abstract:||In this thesis, direct and efficient functionalization of aldehydes with organocatalysts towards synthetic attractive molecules is presented. Chapter II describes the direct α-functionalization of simple aldehydes under oxidative NHC catalysis and the direct generation of ester enolates by using simple nonfunctionalized aldehydes as substrates. The same transformation with only catalytic amount of quinone-derived oxidant can be realized by using much cheaper terminal oxidants MnO2, providing an economic solution for large scale industrial synthesis. Chapter III presents the [3+2] annulations of isatin and β-branched unsaturated aldehyde catalyzed by N-heterocyclic carbene. Synthetic attractive spirocyclic oxindole products are synthesized in generally good yield and diastereoand enantioselectivity. Followed in chapter IV, the first base catalyzed in-situ generation of enesulfonamide is discussed. This enamide derivative underwent facile formal [4+2] addition reactions with α,β-unsaturated imines, producing highly substituted tetrahydropyridines as single diasteromer, which possess huge potential in the synthesis of pharmaceutical and biological compounds.||URI:||https://hdl.handle.net/10356/61843||DOI:||10.32657/10356/61843||Rights:||This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).||Fulltext Permission:||embargo_20220731||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Theses|
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