Journal of the Chemical Society. Chemical communications p. 612 - 613 (1989)
Update date:2022-08-11
Topics:
Wei-Shan, Zhou
Jiang, Biao
Pan, Xin-fu
A stereoselective synthesis of the natural promoting steroids, brassinolide, homobrassinolide, and typhasterol is described, which involves construction of a side chain by lactonisation of Z-(5) under acidid conditions to give an α,β-unsaturated δ-lactone (6) with the inversion of the configuration at C-22 of the epoxy steroid in quantitative yield.
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