Degree Type

Dissertation

Date of Award

2019

Degree Name

Doctor of Philosophy

Department

Chemistry

Major

Chemistry

First Advisor

George A. Kraus

Abstract

Methyl coumalate is a bio-renewable material derived from malic acid. In the first chapter, we focused on the Diels-Alder reaction of methyl coumalate with a variety of dienophiles, including enamines, magnesium salts of indoles and hydroxyquinones. Some provided the bicyclic lactone intermediates, which could be further transformed into aromatic esters by acid/base catalyzed ring opening reactions. Others went through a Diels-Alder/retro Diels-Alder cascade and the carbon dioxide was extruded, affording the corresponding products. As a result, isophthalates, naphthalates and anthraquinone derivatives were successfully synthesized according to this strategy. The natural product Tomichaedin was also synthesized in over 40% yield.

In the second chapter, we have developed a method to in situ generate nitroquinone, and a variety of nucleophiles were tested for the conjugate addition. Substituted nitroquinones can be synthesized in moderate yield via a 1,4-addition – tautomerization cascade. Nucleophiles including indoles, electron rich aromatics and heterocycles all showed good reactivity. Additionally, a divergent synthesis towards Lagumycin and Phenathroviridone skeleton was proposed.

Copyright Owner

Huangchao Yu

Language

en

File Format

application/pdf

File Size

125 pages

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