Synthesis of isotopically labeled phosphoenolpyruvic acid
Phosphoenolypyruvic acid isotopically labeled at C/sub 1/ and C/sub 2/ as well as at the bridging oxygen of the phosphate was synthesized in eleven steps with an overall yield of 15-20%. The cornerstone of this synthesis was the use of 1,3-dithiane as an acyl anion equivalent. The anion derived from this compound was alkylated with isotopically labeled methyl iodide and carboxylated with isotopically labeled carbon dioxide. After protection of the carbonyl group as the benzyl ester, the carbonyl group was unmasked with N-bromosuccinimide. The oxygen of the carbonyl group was exchanged with /sup 18/O water and the benzyl group was removed via hydrogenolysis. The labeled pyruvic acid thus formed was converted to phosphoenolypyruvic acid with a modification of the Perkow reaction. This was accomplished in four steps with a 50% overall yield using dimethyl trimethylsilyl phosphite as the phosphorylating agent. The last four steps were accomplished without isolation of intermediates. The extent of isotopic enrichment was determined using /sup 31/P NMR.
- Research Organization:
- Wisconsin Univ., Madison (USA)
- OSTI ID:
- 6763279
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
CARBOXYLIC ACIDS
EVEN-EVEN NUCLEI
ISOTOPE APPLICATIONS
ISOTOPES
KETO ACIDS
LABELLED COMPOUNDS
LIGHT NUCLEI
MAGNETIC RESONANCE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN 18
OXYGEN ISOTOPES
PHOSPHORUS 31
PHOSPHORUS ISOTOPES
PYRUVIC ACID
RESONANCE
SPECTRA
STABLE ISOTOPES
SYNTHESIS
TRACER TECHNIQUES