An asymmetric synthesis of l-[3-13C]alanine
β Scribed by Kazuhiko Takatori; Sanae Toyama; Shoko Narumi; Seishiro Fujii; Masahiro Kajiwara
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- French
- Weight
- 81 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0022-2135
- DOI
- 10.1002/jlcr.800
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β¦ Synopsis
Abstract
lβ[3β^13^C]Alanine was synthesized from [^13^C]methyl iodide by using Dellaria's oxazinone, prepared from phenyl[2β^13^C]bromoacetate and (S)β2βphenylglycinol, as a chiral glycine equivalent. Alkylation of the oxazinone with [^13^C]methyl iodide was achieved with high diastereoselectivity. Hydrolysis and removal of the chiral auxiliary of the alkylated oxazinone gave lβ[3β^13^C]alanine. Copyright Β© 2003 John Wiley & Sons, Ltd.
π SIMILAR VOLUMES
S p e c i f i c a l l y l a b e l e d , o p t i c a l isomers of a l a n i n e were synthesized from acetic-13C2 a c i d by a six-tjtep procedure with y i e l d s of 37-38% of t h e o p t i c a l l y a c t i v e m a t e r i a l .
The asymmetric peak heights observed in the 13C triplet signals, caused by the 13C-14N dipolar interaction, of the C-a nucleus in L-alanine can he explained by the fact that a given 'H decoupliig frequency cannot simultaneously fulfill the 'on-resonance' condition for each of the three 'H resonances
l-[4-l3 C]Glutamic acid (1) and l-[4-13 C]glutamine (2) were synthesized from sodium [2-13 C]acetate (5) and Dellaria's oxazinone 3 as a chiral glycine equivalent. Sodium [2-13 C]acetate (5) was converted to [2-13 C]acrylate 4. Diastereoselective Michael addition of the enolate of 3 to the acrylate