Chirality Transfer in Acyclic Allylic Systems and New Pd-Catalyzed Heck Reaction/C-H Activation Cascades

Liron, Frédéric (2004): Chirality Transfer in Acyclic Allylic Systems and New Pd-Catalyzed Heck Reaction/C-H Activation Cascades. Dissertation, LMU München: Faculty of Chemistry and Pharmacy

Abstract

In the first part, the use of chirality transfer in acyclic allylic systems was assessed for an intra- and an intermolecular reaction. The thermal [2,3] sigmatropic rearrangement of acyclic allylic phosphinites proved to be highly enantioselective, even at 110 °C and led to enantiomerically pure allylic phosphine oxides. The substitution pattern of the substrate and the reaction conditions were fully optimized.The chirality transfer concept was also used intermolecularly in asymmetric allylic substitution reactions. This allowed to build up enantiomerically pure quaternary centers. The product were then reacted to obtain enantionerically pure tertiary alcohols, desymmetrized 1,3 diols and aldol compounds. In a second part, it was found that Heck reaction leading to neopentylic palladium species underwent, in the absence of nucleophile, a C-H activation reaction, leading to spiro cyclopropyl compounds.

• Item Type: Theses (Dissertation, LMU Munich)
• Keywords: chirality transfer, [2,3] sigmatropic rearrangement, allylic substitution, cascade reactions
• Subjects: 500 Natural sciences and mathematics; 500 Natural sciences and mathematics > 540 Chemistry and allied sciences
• Faculties: Faculty of Chemistry and Pharmacy
• Language: English
• Date of oral examination: 26. July 2004
• 1. Referee: Knochel, Paul
• Signature of the printed copy: 0001/UMC 14132