Synthesis of [6″-3H]-, (6″-2H)- and (2-2H)-maltotriose
✍ Scribed by Bernd Sauerbrei; Jutta Niggemann; Stefan Gröger; Sungsook Lee; Heinz G. Floss
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 698 KB
- Volume
- 280
- Category
- Article
- ISSN
- 0008-6215
No coin nor oath required. For personal study only.
✦ Synopsis
To prepare labeled precursors for biosynthetic studies, methods for the specific introduction of tritium and deuterium into the reducing and the terminal glucose unit of maltotriose were developed. Thus [6"-3H]- and (6"-2H)-maltotriose (17) and (18) were prepared via selective methoxytritylation, deprotection and subsequent modified Pfitzner-Moffatt oxidation, followed by reduction with sodium borotritiide or sodium borodeuteride, respectively. A simple two step procedure utilizing the Lobry de Bruyn/van Ekenstein transformation gave (2-2H)maltotriose (20).
📜 SIMILAR VOLUMES
## Abstract The enantioselective synthesis of [5‐^2^H]‐5‐epi‐shikimic acid starting from commercially available L‐shikimic acid has been accomplished in this work. The introduction of the stable isotope was facilitated by an enzymic reduction of a ketone. An interesting stereospecific enolisation w
with the DessNartin periodinane (1) in fluorotrichloromethane (freon 11). Use of the freon solvent greatly improved the recovery of this volatile aldehyde. Similarly the oxidation of 3,4-2Hz-3Z-hexen-1-ol (5) yielded 3,4-'HZ- 3Z-hexenal (6) in a 92% isolated yield with a purity of greater than 99%.
## 2 , : 'H-NMR (CDCI,): 5.93 (dd, J = 10.7. 1.5); 5.67 6a. 7.7,8,octun-S-oiir @a): 'H-NMR (CDCI,): 3.98, 3.78 ( A R , . 0 ] o l l a l r (9a): ' H-N MR (CDCI,) : 4.02, 3.65 (.4 R, -c/io.~-aspiro~3.5/nori-X-i~.nr~ (7b): 'H-NMR (CDCI,): 6.04 (d, J = 10.4); 5.63 (d, ( d , J = 10.7);4.I0(dd,J=11.7,1.
Deuterated oleates have been synthes/zed by semihydrogenation of acetylenic intermediates. [ll-2H~]Oleate was prepared by two-carbon chain extension of the C~6 alcohol obtained from [1-2l-I~]octyl bromide and 7-octyn-l-oL [8-2H2] and [7-=H2]oleates were both prepared from dimethyl suberate, tetradeu