ISSN:
0170-2041
Schlagwort(e):
N-Acetylneuraminic acid
;
Sialidase
;
Vibrio cholerae
;
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The peracetylated methyl ester 1 of N-acetylneuraminic acid was transformed into the oxazoline derivative 2, which was hydrogenated with Pd/C/H2 to give the 4-deoxy-Neu5Ac2en derivative 3. Acid cleavage of the oxazoline 2 by trifluoroacetic acid (THF) gave the 4-epi-Neu5Ac2en derivative 4a, which was saponified to the known 4-epi-Neu5Ac2en 4b. Treatment of 4a with triphenylphosphane/diethylazodicarboxylate (DEAD)/HN3 in toluene gave the 4-azido-4-deoxy-Neu5Ac2en derivative 5a as well as the 4-epi-azido-4-deoxy-Neu5Ac2en derivative 6a. Both epimers could be saponified yielding the free dehydrosialic acid derivatives 5b and 6b. Furthermore, 4-formamido-4-deoxy-Neu5Ac2en 7b was prepared via the derivative 7a, which was formed from 5a by reaction with triphenylphosphane/formyl acetate. In addition, the free dehydrosialic acid derivatives 5b and 6b were transformed into the stable P—N ylides 8 and 10, but only 8 could be hydrolyzed to the triethylammonium salt of 4-amino-4-deoxy-Neu5Ac2en 9a, which was converted into the zwitter ionic compound 9b. Finally 4-acetamido-4-deoxy-Neu5Ac2en 11e was prepared from 4-acetamido-4-deoxy-N-acetylneuraminic acid 10 via the derivatives 11a and 11b by well-known methods. The compounds 4b, 5b, 6b, 7b, 9b, and 11c were investigated as inhibitors of Vibrio cholerae sialidase, and their Ki values were determined.
Zusätzliches Material:
1 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/jlac.199119910124
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