A convenient method for the synthesis of tritium-labeled brassinosteroids with very high specific activity is reported. A 3H-labeled 24-epicastasterone was isolated in high yield (40 mCi), radiochemical purity (>97%) and a specific activity up to 99 Ci mmol−1. The labeling strategy was designed to employ a radiolabeling step at the late stage of the synthetic sequence.
A. Marek, M. R. Patil and T. Elbert, RSC Adv., 2015, 5, 65214 DOI: 10.1039/C5RA10966C
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