Synthesis of (22R,23R)‐ and (22S,23S)‐[4‐14C]‐24‐EPIBRASSINOLIDE

Abstract
The title compounds were synthesized for metabolic studies in plants and animals, with 14C labelling being made at position 4 of the epibrassinolides 4 and 5 in an overall radiochemical yield of 3.22% and 4.46%, respectively, based on barium [14C]carbonate.