Novel methods for stereocontrolled cycloaddition/dearomatization reactions under catalytic conditions

Abstract : Alkaloids are, in general, a family of heterocyclic compounds of vegetal originthat incorporate nitrogen atoms in their complex structure. Their interest lies in theoutstanding biological activities they present, and for this reason they are widely usedby the pharmaceutical industry. In particular, pyrrolidine and piperidine rings arefundamental scaffolds found in a large number of such structures. On the other hand,one of the main objectives of synthetic chemistry is to obtain these types ofmolecules in an asymmetric way. Among others, metal catalysis has proven to bevery useful for this purpose. For example, ferrocenyl proline ligands previouslydeveloped in our group gave rise to densely substituted enantiopure pyrrolidines.Likewise, these types of ligands have been evaluated in different types ofcycloaddition reactions, which have resulted in the asymmetric formation of tricyclicstructures of biological interest. In contrast, a collective racemic synthesis oftetracyclic compounds of the Securinega family has been developed. This synthesisprovides an access to different natural products of the family due to the divergencegiven by a bicyclic lactone intermediate.
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Aitor Lacambra. Novel methods for stereocontrolled cycloaddition/dearomatization reactions under catalytic conditions. Organic chemistry. Université de Bordeaux, 2017. English. ⟨NNT : 2017BORD0576⟩. ⟨tel-02160811⟩

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