Full text
| |
| Author(s): |
Meire Yasuko Kawamura
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) |
| Defense date: | 2016-07-22 |
| Examining board members: |
Antonio Carlos Bender Burtoloso;
Roberto Gomes de Souza Berlinck
|
| Advisor: | Antonio Carlos Bender Burtoloso |
| Abstract | |
Pumiliotoxins and their congeners are a class of compounds isolated from the skin of some frogs from the Dendrobatidae, Mantellidae, Bufonidae, e Myobatrachidae families, possessing interesting pharmacological activities (cardiotonic activity in low concentrations). Because of the big number of compounds among these toxins (about 100), synthetic methodologies that provide the preparation of these compounds (as well as analogues) in great amounts and in a fast and efficient way using common intermediates, are very important for application in chemical-biology. The α,β-unsaturated diazoketones are promising intermediates for the rapid and efficient synthesis of a range of chemical skeletons, among them, the construction of indolizidine skeleton that pumiliotoxins present. It is important to note that α,β-unsaturated diazoketones with Z geometry (prepared from amino aldehydes) have already the correct stereochemistry for a direct cyclization to construct indolizidine skeletons. The key steps of the work consisted in the preparation of N-protected amino aldehydes, evaluation of Horner-Wadsworth-Emmons reaction in order to obtain α,β-unsaturated diazoketones with Z geometry, and the intramolecular N-H insertion reaction to provide the indolizidine cycle. Another part of the work consisted in the synthesis of iminosugars with piperidine core and aliphatic side chains (application in medicinal chemistry) and in the synthesis of (-)-1-deoxy-altronojirimycin, applying the same methodology (use of α,β-unsaturated diazoketones with Z geometry). (AU) | |
| FAPESP's process: | 13/26399-7 - The use of a,b-unsaturated diazoketones with Z geometry in the direct construction of functionalized indolizidine skeletons: application in the synthesis of dehydrodemethylpumiliotoxins |
| Grantee: | Meire Yasuko Kawamura |
| Support Opportunities: | Scholarships in Brazil - Master |