β-Stereospecific hydroborations of the Δ8(14)-double bond in 13-epi-pimarenes were achieved in the absence of functional groups at C-16 or a double bond at C-15. The reaction carried out on 15,16-dihydrosandaracopimaric derivatives needed more time and a large excess of reagent due to stereochemical restrictions in the transition state.
A. S. Feliciano, M. Medarde, E. Caballero, F. Tomé and B. Hebrero, J. Chem. Soc., Perkin Trans. 1, 1992, 1665 DOI: 10.1039/P19920001665
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