Abstract
A convergent synthesis of biosynthetic precursors of brassinosteroids - secasterol and 24-episecasterol with Δ²-bond in cycle A is described. The key stages in the construction of the side chain of these compounds were Julia olefination of steroid 22-aldehyde followed by asymmetric Sharpless dihydroxylation of the intermediate Δ²²-olefin. Toxicity of synthesized compounds against breast carcinoma MCF-7 cells was studied.
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