Access Type

Open Access Dissertation

Date of Award

1-1-2010

Degree Type

Dissertation

Degree Name

Ph.D.

Department

Chemistry

First Advisor

JAMES H. RIGBY

Abstract

ABSTRACT

TRANSITION METAL-MEDIATED HIGHER-ORDER CYCLOADDITION REACTIONS: APPLICATION TO THE TOTAL SYNTHESIS OF COMPLEX NATURAL PRODUCTS

by

BILAL ABOU ALEIWI

October 2010

Advisor: Dr. James H. Rigby

Major: Chemistry (Organic)

Degree: Doctor of Philosophy

Chromium (0)-mediated [6ð + 2ð] and [6ð + 2ð + 2ð] cycloaddition reactions between cyclic trienes and alkynes is reported. The development, investigation and the application of these reactions in the total synthesis of complex ring systems and natural products is described. Two natural products, namely, ∆ 9(12) -Capnellene and Echinopines A and B were targeted.

An investigation led to the successful development of a methodology to form the linear triquinane ring system of the natural product ∆ 9(12) -Capnellene. This methodology relies mainly on a tandem Chromium (0)-mediated [6ð + 2ð] cycloaddition reaction and a radical cyclization reaction.

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