TY - JOUR

T1 - Development of the First Tritiated Tetrazine

T2 - Facilitating Tritiation of Proteins

AU - Radjani Bidesi, Natasha Shalina

AU - Battisti, Umberto Maria

AU - Lopes van de Broek, Sara

AU - Shalgunov, Vladimir

AU - Dall, Anne-Mette

AU - Bøggild Kristensen, Jesper

AU - Sehlin, Dag

AU - Syvänen, Stina

AU - Moos Knudsen, Gitte

AU - Herth, Matthias Manfred

N1 - © 2022 The Authors. ChemBioChem published by Wiley-VCH GmbH.

PY - 2022

Y1 - 2022

N2 - Tetrazine (Tz)-trans-cyclooctene (TCO) ligation is an ultra-fast and highly selective reaction and it is particularly suited to label biomolecules under physiological conditions. As such, a 3 H-Tz based synthon would have wide applications for in vitro/ex vivo assays. In this study, we developed a 3 H-labeled Tz and characterized its potential for application to pretargeted autoradiography. Several strategies were explored to synthesize such a Tz. However, classical approaches such as reductive halogenation failed. For this reason, we designed a Tz containing an aldehyde and explored the possibility of reducing this group with NaBT 4 . This approach was successful and resulted in [ 3 H]-(4-(6-(pyridin-2-yl)-1,2,4,5-tetrazin-3-yl)phenyl)methan-t-ol with a radiochemical yield of 22 %, a radiochemical purity of 96 % and a molar activity of 0.437 GBq/μmol (11.8 Ci/mmol). The compound was successfully applied to pretargeted autoradiography. Thus, we report the synthesis of the first 3 H-labeled Tz and its successful application as a labeling building block.

AB - Tetrazine (Tz)-trans-cyclooctene (TCO) ligation is an ultra-fast and highly selective reaction and it is particularly suited to label biomolecules under physiological conditions. As such, a 3 H-Tz based synthon would have wide applications for in vitro/ex vivo assays. In this study, we developed a 3 H-labeled Tz and characterized its potential for application to pretargeted autoradiography. Several strategies were explored to synthesize such a Tz. However, classical approaches such as reductive halogenation failed. For this reason, we designed a Tz containing an aldehyde and explored the possibility of reducing this group with NaBT 4 . This approach was successful and resulted in [ 3 H]-(4-(6-(pyridin-2-yl)-1,2,4,5-tetrazin-3-yl)phenyl)methan-t-ol with a radiochemical yield of 22 %, a radiochemical purity of 96 % and a molar activity of 0.437 GBq/μmol (11.8 Ci/mmol). The compound was successfully applied to pretargeted autoradiography. Thus, we report the synthesis of the first 3 H-labeled Tz and its successful application as a labeling building block.

U2 - 10.1002/cbic.202200539

DO - 10.1002/cbic.202200539

M3 - Journal article

C2 - 36333105

VL - 23

JO - ChemBioChem

JF - ChemBioChem

SN - 1439-4227

IS - 23

M1 - e202200539

ER -