Reduction of the ethyl ketone (5) with L-Selectride or zinc borohydride proceeds stereoselectively to give the alcohols syn-(6) or anti-(7), respectively, which are converted, in turn, into (±)-exo-brevicomin and (±)-endo-brevicomin.
D. P. Richardson, W. Wilson, R. J. Mattson and D. M. Powers, J. Chem. Soc., Perkin Trans. 1, 1990, 2857 DOI: 10.1039/P19900002857
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