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4H-Dewar Pyridines: Dearomative approach towards programmable piperidine isosteres
Jan Petrov?i? ; UNIVERSITà DEGLI STUDI DI PAVIA,2024.
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Abstract: Piperidine is the most frequently encountered aliphatic heterocycle in medicinal chemistry. Despite its prevalence, there is a constant demand for improvement of ADME (absorption, distribution, metabolism, excretion) properties of piperidine-containing drugs and drug candidates. 2-azabicyclo[2.2.0]hexanes present an exciting class of more rigid and structurally programmable piperidine isosteres. EVA (exit vector analysis) of the most frequently employed piperidine isosteres and 2-azabicyclo[2.2.0]hexanes is presented, and a side-by-side comparison is made. This dissertation describes our endeavors towards the expansion of accessible 2-azabicyclo[2.2.0]hex-5-ene chemical space, our exploration of 2-azabicyclo[2.2.0]hex-5-ene scaffold reactivity in olefin functionalization reactions and installation of synthetically useful handles. The malleability and practicality of 2-azabicyclo[2.2.0]hexane core is demonstrated by preparation of several isosteres of piperidine-containing drugs and lead compounds. A general blueprint for functionalized 2-azabicyclo[2.2.0]hexanes is devised. Special attention is devoted to “pseudoaxial” C5-substituted-2-azabicyclo[2.2.0]hexanes, which could serve as isosteres of piperidines in their thermodynamically unfavorable axial conformations without the need to introduce additional carbon atoms. La piperidina è l’eterociclo alifatico più frequente nella chimica farmaceutica (medicinal chemistry). Nonostante la sua prevalenza, c’è una costante domanda for il miglioramento delle proprietà ADME (assorbimento, distribuzione, metabolismo, escrezione) di farmaci e candidati farmaci contenenti strutture piperidiniche. Gli 2-azabiciclo[2.2.0]esani rappresentano un’interessante classe di isosteri della piperidina più rigidi e programmabili strutturalmente. L’EVA (exit vector analysis, analisi di vettore di uscita) degli isosteri della piperidina più frequentemente utilizzati e di 2-azabiciclo[2.2.0]esani viene mostrata, ed è stata eseguita una comparazione tra loro. Questa tesi descrive i nostri sforzi verso l’espansione di spazio chimico accessibile dei 2-azabiciclo[2.2.0]es-2-eni, la nostra esplorazione della reattività della struttura di tipo 2-azabiciclo[2.2.0]es-2-ene nelle reazioni di funzionalizzazione delle olefine e l’installazione di appigli sinteticamente utili. La malleabilità e praticabilità del nucleo di tipo 2-azabiciclo[2.2.0]es-2-ene è dimostrata dalla preparazione di diversi isosteri di farmaci e composti guida, contenenti strutture piperidiniche. Un progetto generale per la funzionalizzazione di 2-azabiciclo[2.2.0]es-2-eni è stato elaborato. Un’attenzione particolare è stata riservata ai 2-azabiciclo[2.2.0]es-2-eni con sostituenti sul C5 “psuedoassiali”, che possono servire come isosteri di piperidine nella loro conformazione assiale termodinamicamente sfavorevole, senza la necessità di introdurre atomi di carbonio addizionali.
Purchased from AmBeed: 100-54-9 ; 939-23-1 ; 3796-23-4 ; 3430-16-8 ; 154105-64-3
CAS No. : | 3796-23-4 | MDL No. : | MFCD00100032 |
Formula : | C6H4F3N | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | JTZSFNHHVULOGJ-UHFFFAOYSA-N |
M.W : | 147.10 | Pubchem ID : | 77417 |
Synonyms : |
|
Signal Word: | Danger | Class: | 3,6.1 |
Precautionary Statements: | P210-P233-P240-P301+P310-P303+P361+P353-P305+P351+P338 | UN#: | 1992 |
Hazard Statements: | H226-H300-H315-H319-H335 | Packing Group: | Ⅲ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
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