The enantiomerically pure cis-1,2-diol 2, which is obtained by microbial oxidation of toluene, has been converted, via a sequence of reactions including high-pressure promoted Diels–Alder cycloaddition and oxa-di-π-methane rearrangement steps, into the triquinane (−)-hirsutene (1).
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Banwell et al. (2002) studied this question.
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