## Abstract The synthesis of racemic [2‐^11^C]phenylglycine, starting with ^11^CO~2′~ is reported. The [^11^C]benzaldehyde, prepared as previsously described in a two‐step reaction from the corresponding [^11^C]benzoic acid salt, was used in a modified Bücherer‐Strecker reaction. The radiochemical
Synthesis of racemic [2′-13C]tryptophan
✍ Scribed by B. R. Branchini; F. G. Prendergast; G. A. Spencer; J. D. Hugdahl; B. D. Ray; M. D. Kemple
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- French
- Weight
- 310 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
2-l3C] Indole was synthesized in 39% yield by a three-step procedure starting with K13CN. The labeled indole was converted to D,L[2'-13d tryptophan in three subsequent steps and the overall yield from K13CN was 13.5%. Proton and 13C-NMR, and GC/mass spectral analyses confirmed the position and extent of 13C incorporation.
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## Abstract A Strecker synthesis of isobutyraldehyde, K^13^CN and ammonia produced D,L‐[1‐^13^C] valine in 83% yield. This racemic mixtue was then converted to the L‐form via a D‐amino acid oxidase ‐ branched amino acid aminotransferase system in an overall yield of 75% based on K^13^CN. Given the
## Abstract [2′‐^13^C]Biotin was synthesized in 51% yield by reaction of the hydrolysis product of biotin, 3,4‐diaminotetrahydro‐2‐thiophenvalerianic acid, with [^13^C]phosgene.
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CIQuinoline and [3-Clquinoline were synthesised by a five-step process starting from isatin. Acetylation of isatin with acetyl chloride labelled in either the 1or 2-position, was followed by the Pfitzinger reaction to give 2-hydroxy-4-quinoline carboxylic acid labelled in the 2- or 3-position. Dec
## Abstract We have developed a stereospecific chemomicrobiological synthesis of labeled tryptophan. L‐[3‐^13^C]Serine, [1‐^15^N]‐ and [2‐^13^C]indole were used as precursors for the synthesis of L‐[β‐^13^C]‐, L‐[1′‐^15^N]‐, and L‐[2′‐^13^C]tryptophan, respectively. The labeled precursors were inco