Synthesis and mass spectral characterization of mycobacterial phosphatidylinositol and its dimannosides.
J Org Chem
; 77(16): 6743-59, 2012 Aug 17.
Article
em En
| MEDLINE
| ID: mdl-22845613
ABSTRACT
A family of naturally occurring mycobacterial phosphatidylinositol (PI) and its dimannosides (PIM(2), AcPIM(2), and Ac(2)PIM(2)) that all possess the predominant natural 190/160 phosphatidyl acylation pattern were prepared to study their mass spectral fragmentations. Among these, the first synthesis of a fully lipidated PIM (i.e., (160,180)(190/160)-PIM(2)) was achieved from (±)-1,24,5-diisopropylidene-D-myo-inositol in 16 steps in 3% overall yield. A key feature of the strategy was extending the utility of the p-(3,4-dimethoxyphenyl)benzyl protecting group for its use at the O-3 position of inositol to allow installation of the stearoyl residue at a late stage in the synthesis. Mass spectral studies were performed on the synthetic PIMs and compared to those reported for natural PIMs identified from a lipid extract of M. bovis BCG. These analyses confirm that fragmentation patterns can be used to identify the structures of specific PIMs from the cell wall lipid extract.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatidilinositóis
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Inositol
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Manosídeos
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Mycobacterium bovis
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article