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Alternative syntheses of [73,75Se]selenoethers exemplified for homocysteine[73,75Se]selenolactone

  • J. Ermert , T. Blum , K. Hamacher and Heinz H. Coenen
Published/Copyright: September 25, 2009
Radiochimica Acta
From the journal Radiochimica Acta Volume 89 Issue 11-12

The present work describes two radiosynthetic pathways to prepare homocysteine[75Se]selenolactone 1 starting from n.c.a. [75Se]selenite 2. It was achieved either by alkylation reaction of n.c.a. methyl[75Se]selenide 4 or by hydrolysis of alkylated 1,3-dicyclohexyl[75Se]selenourea 11.

N.c.a. methyl[75Se]selenide 4 is available using sulfur as non-isotopic carrier. However, the radiochemical yield of the substitution of 2-tert.-butoxycarbonylamino-4-bromobutyric acid ethylester 5 with n.c.a. methyl-[75Se]selenide is only in the range of 15-20%. Birch reduction of protected n.c.a. [75Se]selenomethionine 6 formed leads to a RCY of 5-10% homocysteine[75Se]selenolactone 1.

Alternatively, the synthesis of homocysteine[75Se]selenolactone 1 is possible by hydrolysis of the corresponding [75Se]selenouronium salt 11 available by addition of 2-tert.-butoxycarbonylamino-4-bromobutyric acid ethylester 5 to 1,3-dicyclohexyl[75Se]selenourea 10. A method was developed for the synthesis of 1,3-dicyclohexyl[75Se]selenourea 10 by addition of c.a. [75Se]SeH2 to 1,3-dicyclohexylcarbodiimide, which leads to 20-30% RCY of c.a. homocysteine[75Se]selenolactone 1.

Published Online: 2009-9-25
Published in Print: 2001-11-1

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  2. Impact of the contributions of Glenn T. Seaborg on nuclear science
  3. Characteristics of two fission modes
  4. Excitation energy division in 51V+197Au collisions 75 MeV above the barrier
  5. Thin target cross sections for proton-induced formation of radionuclides from lead for Ep≤71 MeV
  6. Radiochemical study on the mechanism of target fragmentation of Cu, Nb, Pr and Au targets induced by 12C and 40Ar projectiles
  7. Metal ion - molecule reactions of Bk+: comparison with Pu+ and Tb+
  8. Aqueous chemistry of transactinides
  9. Quantum chemical predictions of properties and experimental behaviour of elements 106, 107, and 108
  10. Startup of transactinide chemistry in JAERI
  11. Physico-chemical characterization of seaborgium as oxide hydroxide
  12. First attempt to chemically identify element 112
  13. ISOLDE target and ion source chemistry
  14. Separation of actinide redox species with cation exchange chromatography and its application to the analysis of spent fuel leaching solutions
  15. Development of digital autoradiography technique for the determination of the platinum-group elements in geological materials
  16. Radionuclide speciation in the environment: a review
  17. Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz
  18. α-Crystalline polyantimonic acid - an adsorbent for radiostrontium, and a potential primary barrier in waste repositories
  19. Application of radiotracer techniques to a kinetic study of the interaction of Eu with humic acid
  20. Distribution of 212Pb, 214Pb and 210Pb with its daughter products on aerosol fractions from Vienna and Badgastein (Austria)
  21. Sorption studies of Cs+, Ba2+, and Co2+ ions on bentonite using radiotracer, ToF-SIMS, and XRD techniques
  22. Use of extraction chromatography for thorium purification from Eskisehir-Beylikahir Thorium-REEs ore deposit
  23. Pollutant concentrations in a sediment core dated by Th-isotopic ratios and the 210Pb dating method
  24. On the origin of 129I in rain water near Zürich
  25. Determination of uranium and thorium in complex matrices by two solvent extraction separation techniques and photon electron rejecting alpha liquid spectrometry
  26. Using 13N as tracer in heterogeneous atmospheric chemistry experiments
  27. Continuous on-line calibration of diffusive soil-atmosphere trace gas transport using vertical 220Rn- and 222Rn-activity profiles
  28. A radiochromatograpic study of the reaction of 51CrO3 with hydrochloric acid
  29. Pion transfer processes of pionic atoms in the gas mixtures containing hydrogen at various pressures
  30. Production of positron emitters of metallic elements to study plant uptake and distribution
  31. Gallium-67 production at Bucharest U-120 classical cyclotron
  32. Alternative syntheses of [73,75Se]selenoethers exemplified for homocysteine[73,75Se]selenolactone
  33. Formulation and preliminary clinical application of the 99mTc(V)-dimercaptosuccinic acid "instant" kit
https://doi.org/10.1524/ract.2001.89.11-12.863

Articles in the same Issue

  1. Preface: The Fifth International Conference on Nuclear and Radiochemistry, NRC5
  2. Impact of the contributions of Glenn T. Seaborg on nuclear science
  3. Characteristics of two fission modes
  4. Excitation energy division in 51V+197Au collisions 75 MeV above the barrier
  5. Thin target cross sections for proton-induced formation of radionuclides from lead for Ep≤71 MeV
  6. Radiochemical study on the mechanism of target fragmentation of Cu, Nb, Pr and Au targets induced by 12C and 40Ar projectiles
  7. Metal ion - molecule reactions of Bk+: comparison with Pu+ and Tb+
  8. Aqueous chemistry of transactinides
  9. Quantum chemical predictions of properties and experimental behaviour of elements 106, 107, and 108
  10. Startup of transactinide chemistry in JAERI
  11. Physico-chemical characterization of seaborgium as oxide hydroxide
  12. First attempt to chemically identify element 112
  13. ISOLDE target and ion source chemistry
  14. Separation of actinide redox species with cation exchange chromatography and its application to the analysis of spent fuel leaching solutions
  15. Development of digital autoradiography technique for the determination of the platinum-group elements in geological materials
  16. Radionuclide speciation in the environment: a review
  17. Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz
  18. α-Crystalline polyantimonic acid - an adsorbent for radiostrontium, and a potential primary barrier in waste repositories
  19. Application of radiotracer techniques to a kinetic study of the interaction of Eu with humic acid
  20. Distribution of 212Pb, 214Pb and 210Pb with its daughter products on aerosol fractions from Vienna and Badgastein (Austria)
  21. Sorption studies of Cs+, Ba2+, and Co2+ ions on bentonite using radiotracer, ToF-SIMS, and XRD techniques
  22. Use of extraction chromatography for thorium purification from Eskisehir-Beylikahir Thorium-REEs ore deposit
  23. Pollutant concentrations in a sediment core dated by Th-isotopic ratios and the 210Pb dating method
  24. On the origin of 129I in rain water near Zürich
  25. Determination of uranium and thorium in complex matrices by two solvent extraction separation techniques and photon electron rejecting alpha liquid spectrometry
  26. Using 13N as tracer in heterogeneous atmospheric chemistry experiments
  27. Continuous on-line calibration of diffusive soil-atmosphere trace gas transport using vertical 220Rn- and 222Rn-activity profiles
  28. A radiochromatograpic study of the reaction of 51CrO3 with hydrochloric acid
  29. Pion transfer processes of pionic atoms in the gas mixtures containing hydrogen at various pressures
  30. Production of positron emitters of metallic elements to study plant uptake and distribution
  31. Gallium-67 production at Bucharest U-120 classical cyclotron
  32. Alternative syntheses of [73,75Se]selenoethers exemplified for homocysteine[73,75Se]selenolactone
  33. Formulation and preliminary clinical application of the 99mTc(V)-dimercaptosuccinic acid "instant" kit
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