A Caltech Library Service

The Total Synthesis of Macrolide Antibiotics


Daub, John Powell (1983) The Total Synthesis of Macrolide Antibiotics. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/87f1-5d52.


An approach to the total synthesis of macrolide antibiotics via the key spiroketal intermediates i and ii, which possess all of the stereochemistry for the macrolides 10-deoxymethynolide (iii) and methynolide (iv), is described. Initially, the exocyclic enol ether v, which through hetero-Diels-Alder condensation with an α,β-unsaturated carbonyl compound would lead to these spiroketals i and ii, was prepared stereoselectively in optically pure form from 4,6-O-benzylidene-D-allal and was converted into the Prelog-Djerassi lactone (vi) by way of stereochemical confirmation. The low reactivity of this sensitive enol ether v toward hetero-Diels-Alder condensation led to the development of a new, high yield spiroketal synthesis through hetero-Diels-Alder condensation of the keto-enol ether vii with hetero-dienes; and, in this manner, the spiroketals i and ii were prepared stereoselectively. Cleavage of these spiroketals i and ii by thioketal exchange with 1,2-ethanedithiol led to seco-acid derivatives for the synthesis of the macrolides iii and iv. Additionally, a formal total synthesis of the antibiotic methymycin is achieved.

[See abstract in scanned thesis for chemical diagrams referenced above.]

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Dervan, Peter B.
Thesis Committee:
  • Dervan, Peter B. (chair)
  • Goddard, William A., III
  • Evans, David A.
Defense Date:16 August 1982
Funding AgencyGrant Number
Record Number:CaltechTHESIS:09032019-095416829
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Chapter 1.
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11784
Deposited By: Mel Ray
Deposited On:04 Sep 2019 14:28
Last Modified:19 Apr 2021 22:26

Thesis Files

PDF - Final Version
See Usage Policy.


Repository Staff Only: item control page