Tg. Back et K. Minksztym, Synthesis of a novel azidocastasterone derivative as a potential photoaffinity label for the brassinosteroid receptor, SYNLETT, (2), 1999, pp. 201-203
(22R, 23R, 24R)-24-Azido-26,27,28-trinorcastasterone (3) was synthesized fr
om stigmasterolin 12 steps via the reaction of Ti(O-iPr)(2)(N-3)(2) with th
e corresponding suitably protected threo-22-hydroxy-23,24-epoxide 4.