Brassinosteroids and their congeners, brassinolide 1, castasterone 2, 25-methylbrassinolide 3, 25-methylcastasterone 4 and (24R)-24-phenylbrassinone 5, have been stereoselectively synthesized by employing the pyranone derivative 19 as a versatile intermediate for the construction of the side chain.
M. Tsubuki, K. Keino and T. Honda, J. Chem. Soc., Perkin Trans. 1, 1992, 2643 DOI: 10.1039/P19920002643
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