Brassinolide and its analogues, VIII. Synthesis of 25‐methyldolichosterone, 25‐methyl‐2,3‐diepidolichosterone, 25‐methylcastasterone and 25‐methylbrassinolide

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<jats:title>Abstract</jats:title><jats:p>Two naturally occurring C<jats:sub>29</jats:sub>‐brassinosteroids, 25‐methyldolichosterone (<jats:bold>1</jats:bold>) and 25‐methyl‐2,3‐diepidolichosterone (<jats:bold>2</jats:bold>), were synthesized from stigmasterol. 25‐Methylcastasterone (<jats:bold>3</jats:bold>) and 25‐methylbrassinolide (<jats:bold>4</jats:bold>) were also synthesized, and the latter was found to be a more potent plant growth‐regulator than brassinolide itself.</jats:p>

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