Document Type
Thesis
Date of Degree Completion
Spring 2019
Degree Name
Master of Science (MS)
Department
Chemistry
Committee Chair
Timothy K. Beng
Second Committee Member
JoAnn Peters
Third Committee Member
Levente Fabry-Asztalos
Fourth Committee Member
Gil Belofsky
Abstract
The stereocontrolled synthesis of functionalized piperazines is of great interest to pharmaceutical companies owing to their multiple biological activities such as antidepressant, antiparasitic, anticancer and antiretroviral. Current methods towards functionalized piperazines include intramolecular cyclization of appropriately tethered on acyclic precursors as well as α-C–H functionalization of intact piperazine rings. Although effective for the most part, these methods suffer from drawbacks such as the use of expensive catalysts, potentially toxic reagents, limited scope and functional group compatibility. Seeking to side-step some of the aforementioned limitations, we herein describe a step-economical-, cost-effective-, transition metal-free-, and mild approach to highly functionalized piperazines, including [3.3.1]-bicyclic piperazines. The success of a novel enolate hydroalkylation methodology hinges on a cascade reaction triggered by the addition of allyl magnesium bromide to a vicinally functionalized piperazinonate. Furthermore, we have successfully synthesized fluorinated ketopiperazine, in hopes of potentially modulating biological properties such as pharmacokinetic and physicochemical properties. The [3.3.1] azabicyclic piperazinols and fluorine-containing 2-oxopiperazines are subsequently engaged in structure-activity-relationship (SAR) studies on neglected tropical diseases (NTDs), including leishmaniasis.
Recommended Citation
Moreno, Antonio, "Modular Synthesis and Hydroalkylation of Vicinally Functionalized Ketopiperazines: A solution to the Piperazine Problem" (2019). All Master's Theses. 1215.
https://digitalcommons.cwu.edu/etd/1215
Language
English