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Total synthesis of Isopetasol:
Reference: Yamakawa, K.; Izuta, I.; Oka, H.; Sakaguchi, R. Tetrahedron Lett. 1974, 2187. DOI
Keywords: Ketone → Ketal • Ketone → Alkyl-OH • CompRed-Ketone/Enone+M-H • KetoEster+Li-Me • CompE+-CarboxEster/Ketone+M-R • Claisen acylation, carbonate • Ketone enolate+Carbonate • Robinson annulation, ketone • Ketone enolate+Enone • Cyclohexenone • Ketone → Ketal • CompE+-Ketone/Enone+glycol • Ketal → Ketone • Dehydration → Enoate •
Reagents: Methyl vinyl ketone • TsOH • Glycol • O=C(OR)2 • NaH • MeLi • BH4-Na+

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