Thl: perawtylstcd mcthyl cstcr dcrivativcs of 7-rpi-i-NeuSAc (ta), H-epi-NeuSAc (3 a), and 7.8-bis-epi-NcuSAc (4 a) wcrc transformed hy trimcihylsilyl trifluoromethanesulronale into the corrcsponding 2-cieoxy-2,3-didehydro derivatives 2b-4 b. As minor products the 4.5-osazolino derivatives 5 b rind
On the side-chain conformation of N-acetylneuraminic acid and its epimers at C-7, C-8, and C-7,8
β Scribed by Rudolf Christian; Gerhard Schulz; Hannelore H. Brandstetter; Erich Zbiral
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 631 KB
- Volume
- 162
- Category
- Article
- ISSN
- 0008-6215
No coin nor oath required. For personal study only.
β¦ Synopsis
The side-chain conformation of N-acetylneuraminic acid and analogs has been studied by n.m.r. spectroscopy. The results of the 1H-, 13C-n.m.r.-, and 1H-nuclear-Overhauser-enhancement measurements were used to distinguish between different local-minima conformations suggested by hard-sphere calculations. Attempts were made to correlate the major conformation determined for each compound with the behavior towards activation with N-acetylneuraminic acid-CMP-synthetase.
π SIMILAR VOLUMES
A ncw approach to 5-acetamido-3.5-dideoxy-~-g/ycero-~-u/fro-2iionulopyranosonic acid (6; 7,8-bis-epi-NeuSAc) and S-acetamido-.~,~-dideoxy-D-y/ycrro-L-aIrro-?-nonulopyranosonic acid (9; 'I-epi-Ncu5Ac) is prcsented.
## Antibiotics U 1200 Preparation of the Three C1-C7 (I), C8-C15 (II), and C16-N22 (III) Fragments of the Hsp90 Inhibitor Herbimycin A (IV). -(CENTONZE-AUDUREAU,
## Abstract A HofmannβMartius rearrangement mechanism is suggested for the reaction of known azomethines (I) with cyclohexaneβ1,3βdione.