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Total synthesis of Butterfly Compound:
Reference: Sum, F. W.; Weiler, L. Chem. Commun. 1978, 985. DOI
Keywords: CarboxEster → Alkyl-OH • Allyl-X → Allyl-Br • Ketone → Enolphosphate • O-THP → O-H • Ketoester dianion+Alkyl-X • Alkyl-X+Enolate • Cu-Me+EnoateEster • Ketoester dianion+Alkyl-X • Alkyl-X+Enolate • O-H → O-SO2R • Cu-Me+EnoateEster • Allyl-OH → Allyl-Br • Finkelstein reaction •
Reagents: BuLi(n) • Bromoethanol • P(O)(OR)2Cl • LiCuMe2 • AlH4-Li+ • BuLi(n) • Bromide, lithium • Acetoacetate • BuLi(n) • P(O)(OR)2Cl • LiCuMe2 • NaH • NaH • Sulfonyl chloride, methane •

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