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Title: Progress towards the total synthesis of Herquline A and B
Author: Yang, He
ISNI:       0000 0004 5370 8862
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2015
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Herquline A and B were isolated from the fungal strain \(Penicillium\) \(herquei\) Fg-372 and have been shown to exhibit potent platelet aggregation inhibitory activities. The unusual and strained structure of herquline A makes it a highly attractive and challenging synthetic target. Herquline B is conceived to be an analogue of herquline A, even though its absolute structure has not been elucidated. A biomimetic approach was initially investigated in Chapter 2, featuring an intramolecular direct oxidative phenol coupling strategy. While extensive experimentation failed to afford the desired coupling products, an advanced piperazine intermediate possessing a similar ring system to that in herquline A was accessed. Chapter 3 describes the transition metal-mediated intramolecular aryl coupling strategy. Small amounts of biaryl coupling products were fashioned. The conformational analysis of diketopiperazines and piperazines is also introduced. Chapter 4 describes the efforts in the synthesis of analogues of herquline B. The intramolecular coupling at the piperazine stage was found to be challenging and only trace amounts of the desired products were obtained.
Supervisor: Not available Sponsor: University of Birmingham ; School of Chemistry ; Chinese Scholarship Council (CSC)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry