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|All Authors / Contributors:||
Tifelle Ngouansavanh; Jieping Zhu; Université de Paris-Sud. Faculté des Sciences d'Orsay (Essonne).
|Description:||1 vol. (456 p.) : ill. en noir et en coul. ; 30 cm.|
|Responsibility:||Tifelle Ngouansavanh ; [sous la direction de] Zieping Zhu.|
This scientific project focuses in particular on the development of new reactions tandem, combining oxidation process and multi-component reactions and on the approach towards total synthesis of (-)-norsuaveoline. In the first part of this work, we have developed a new concept: the oxidative Passerini reaction in the presence of IBX. The reaction is carried out in mild conditions and provided a wide variety of alpha-acyloxycarboxamides in one step. Primary alcohol is an efficient partner in the oxidative Passerini reaction and this methodology has demonstrated the potential of such a process, particularly when the aldehyde is unstable or difficult to handle. Then, this concept has been extended to the Ugi reaction and allowed a dual acylation of nitrogen and alpha-carbon centers of tetrahydroisoquinoline and provided Csp3-Csp2 bonds in one step. Morever this tandem oxidation / UGI reaction is particularly rapid and efficient for the synthesis of polypetides, without the use of peptide-coupling agents and protection / deprotection steps. Eventually, the second part of this research project described our approach towards the total synthesis of an alkaloid : the (-)-norsuaveoline. The original and synthetic approach based on modular construction of the molecule from the right side starting from L-(-)-glutamic acid, and a late formation of indole nucleus by a palladium catalysed heteroannulation with substituted o-iodoanilines. During this work, we validated three key-steps of the synthesis : formation of oxazole with lithiated methylisocyanide, intramolecular Kondrat'eva reaction leading to a trisubstituted pyridine and formation of a indole derivative with a palladium catalysed heteroannulation already developed in our laboratory.