Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 4 of 4 for “"syn selective"”.
-
Diastereoselective α-Alkylation of Chiral β-Borylated Esters
The use of boron in the synthesis and development of asymmetric methodologies and various biological and medicinal compounds has increased significantly over the last decade. This thesis reports the development of a novel diastereoselective reaction for the α-alkylation of chiral β-borylated …
-
Asymmetrische Synthese von Tarchonanthuslacton und Pironetin-Bausteinen
… Aim of this thesis was an efficient asymmetric synthesis of the aforementioned natural product. The keyintermediates in the synthesis are an unsaturated SAMP-hydrazone and an alpha,beta-unsaturated lactone. The SAMP-hydrazone was easily prepared utilizing a stereoselective alpha-alkylation of …
-
Nucleophilic Addition to Azoalkenes; Diastereoselective Synthesis of β-Hydroxy Ketones and β,γ-Fused γ-Lactams
… enolates to alkyl halides is a fundamental synthetic transformation, but its utility is limited because the key bond-forming step proceeds in a bimolecular nucleophilic substitution fashion. Here in the first part of the dissertation, we describe how an umpolung strategy that involves the …
-
Organokatalytische Synthesen biologisch aktiver Naturstoffe : Totalsynthesen von Amaminol A und B und (+)-Mitsugashiwalacton sowie Synthesen 2,6-disubstituierter Tetrahydropyranen
… work, for the first time, developed a complete synthesis of amaminol B, which, starting from 2E,4E-hepta-2,4-dien-1-ol and in a process of only eleven steps achieves a total yield of 21%. The overall concept of the complete synthesis of amaminol A and B is characterised by three key …