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UBC Theses and Dissertations
Macrolides : chemistry and progress towards a catalytic antibody Spracklin, Douglas K.
Abstract
As part of a continuing study examining the chemistry and conformational behaviour of keto 13-tetradecanolides, 11 -oxo- 13-tetradecanolide (24) was synthesized. In the preparation of the acyclic precursor, optimal yields were obtained when the C-11 ketone was protected until the macrocyclic ring had been formed. Otherwise, a protected β-hydroxy group was eliminated under both acidic and basic conditions. The cyclization was accomplished via a trichlorobenzoyl chloride intermediate. Reduction of 24 using lithium tri-sec-butylborohydride (L-Selectride) gave the (11R* , 13S*)isomer of 49 in >99.8% diastereoselectivity. The relative stereochemistry of 49 was determined by reduction and conversion of the 1,3-diol to an acetonide for ¹³C NMR analysis. Molecular mechanics calculations were used to determine the possible low energy conformations for compounds 24 and 49. Reduction of 24 from the preferred twist [3434] conformations would be expected to give rise to product 49 as is indeed observed. The calculations also predicted ¹H NMR coupling constants in good agreement with the observed values for both 24 and 49. [chemical compound diagrams] As part of an effort to develop a catalytic antibody for the synthesis of macrocyclic lactones, polyclonal antibodies against the phosphonate hapten 130 were raised. These antibodies demonstrated hapten-specific binding, but they did not catalyze the lactonization of a corresponding hydroxy ester substrate under the conditions examined. [chemical compound diagrams]
Item Metadata
Title |
Macrolides : chemistry and progress towards a catalytic antibody
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
As part of a continuing study examining the chemistry and conformational
behaviour of keto 13-tetradecanolides, 11 -oxo- 13-tetradecanolide (24) was synthesized.
In the preparation of the acyclic precursor, optimal yields were obtained when the C-11
ketone was protected until the macrocyclic ring had been formed. Otherwise, a protected
β-hydroxy group was eliminated under both acidic and basic conditions. The cyclization
was accomplished via a trichlorobenzoyl chloride intermediate.
Reduction of 24 using lithium tri-sec-butylborohydride (L-Selectride) gave the
(11R* , 13S*)isomer of 49 in >99.8% diastereoselectivity. The relative stereochemistry
of 49 was determined by reduction and conversion of the 1,3-diol to an acetonide for ¹³C
NMR analysis.
Molecular mechanics calculations were used to determine the possible low energy
conformations for compounds 24 and 49. Reduction of 24 from the preferred twist
[3434] conformations would be expected to give rise to product 49 as is indeed observed.
The calculations also predicted ¹H NMR coupling constants in good agreement with the
observed values for both 24 and 49.
[chemical compound diagrams]
As part of an effort to develop a catalytic antibody for the synthesis of macrocyclic
lactones, polyclonal antibodies against the phosphonate hapten 130 were raised. These
antibodies demonstrated hapten-specific binding, but they did not catalyze the lactonization
of a corresponding hydroxy ester substrate under the conditions examined.
[chemical compound diagrams]
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Extent |
4321238 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-11
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0059352
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.