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[reaction: see text] Siphonarienolone (1) has been synthesized from siphonarienal (3) in 66% over four steps. Synthesis of 3, in turn, has been achieved in two steps (85% combined yield) from 4, prepared from 3-buten-1-ol in seven steps (23% combined yield). Also, a two-step conversion of 3 into siphonarienone (2) is reported.
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Magnin‐Lachaux et al. (2004) studied this question.
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