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[structure: see text] The ABC tristetrahydropyran substructure 1 of the natural products thyrsiferol (2) and venustatriol (3) has been synthesized in 14 steps from farnesyl acetate, with effective control of all aspects of regio- and stereoselectivity in the formation of each tetrahydropyran ring.
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McDonald et al. (2002) studied this question.
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