A testing ground for cyclopentannulation strategies: the triquinane natural product hirsutene is obtained through the intramolecular organocatalytic [3+2] cycloaddition of the 1,7-enyne (E)-1 . The cycloaddition is stereospecific: reaction of the corresponding Z isomer provides the epimeric diquinane.
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Wang et al. (2003) studied this question.
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