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ID 114085
Title Alternative
Development of Novel Functional Molecules Based on the Molecular Structure Characteristics of Diketopiperazines
Author
Keywords
diketopiperazine
conformation
CH/p interaction
N-methylation
siderophore
organocatalyst
Content Type
Journal Article
Description
This article focuses on our investigation of the molecular structure characteristics of diketopiperazines (DKPs), and application of these findings to the development of novel functional molecules. DKPs bearing a benzyl moiety are known to adopt a folded conformation, in which the benzyl moiety is folded over the DKP ring. In order to investigate the driving force behind the folded conformation, we synthesized DKPs bearing a benzyl moiety with different para-substituents, and demonstrated that the folded conformation likely arose from intramolecular CH/p interactions, based on the electronic effects of para-substituents on the benzyl group in 1H NMR spectroscopy. On the other hand, N4-methylation of DKPs bearing a benzyl moiety was found to change their folded conformation to an extended conformation, based on single crystal X-ray crystallography and 1H NMR spectroscopy analysis. Next, we attempted to synthesize both hydroxamate-type siderophores containing the DKP ring: rhodotorulic acid and erythrochelin. Facile synthesis of rhodotorulic acid and its N,N′-dimethylated derivative was achieved by microwave-assisted cyclization of the corresponding dipeptide precursors. Interestingly, N,N′-dimethylated rhodotorulic acid was found to be more soluble in various organic solvents than rhodotorulic acid. Moreover, erythrochelin was synthesized for the first time, and its metal-chelating ability with not only Fe(III) but also Mg(II) was confirmed based on electrospray ionization mass spectrometry (ESI-MS) analysis. Finally, we synthesized DKPs bearing a primary amino group, and found that they could catalyze the asymmetric aldol reaction between hydroxyacetone and p-nitrobenzaldehyde.
Journal Title
Journal of the Pharmaceutical Society of Japan
ISSN
13475231
00316903
NCID
AA11696503
AN00284903
Publisher
日本薬学会
Volume
137
Issue
12
Start Page
1505
End Page
1516
Published Date
2017-12-01
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Pharmaceutical Sciences