Synthesis and Biological Evaluation of Antibacterial Small Molecule Activators of Caseinolytic Protease P and the Synthetic Utility of Metal Carboxylate Salts in Amidation Reactions with Amines
Bibliographic record
Abstract
This thesis is presented in two parts and summarizes work carried out in the laboratory of Professor Robert A. Batey at the University of Toronto from September 2009 through March 2016. Part 1 of this thesis covers the synthesis and biological evaluation of two types of small molecules which target bacterial Caseinolytic Protease P (ClpP); these are the cyclic acyldepsipeptide (ADEP) class of antibiotics and related analogues (Chapter 2) and the ACP1 analogues (Chapter 3). Part 2 of this thesis outlines work related to the synthetic utility of metal carboxylate salts in amide bond-forming reactions with amines.\nPart 1 of this thesis begins with an introductory chapter (Chapter 1) on antibiotics to familiarize the reader with antibiotic classes, bacterial mechanisms of drug resistance as well as strategies for antibacterial drug discovery. Next, Chapter 2 details the total synthesis and biological evaluation of the A54556 ADEP natural products and related analogues. In the course of our investigations on this class of compound, a rapid two-step synthetic approach was developed that utilized a combination of solid-phase peptide chemistry and a novel lanthanide salt-promoted macrolactonization reaction. Importantly, this methodology was used to prepare several structurally diverse analogues. Chapter 3 then describes the synthesis and biological evaluation of ACP1 and related analogues. In contrast to the ADEPs, ACP1 was discovered using a high-throughput screen and several structurally unique analogues were synthesized in an attempt to improve potency and understand the structural features that impart biological activity. \nPart 2 of this thesis covers amidation reactions from the direct coupling of metal carboxylate salts with amines or ammonium salts in the presence of the coupling reagent HBTU (Chapter 4). A wide variety of carboxylate salts were examined and the methodology was later extended to multistep, one-pot variants using carboxylate salts that were generated in situ.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".