Palladium-catalyzed regioselective cyclopropanating allenylation of (2,3-butadienyl)malonates with propargylic carbonates and their application to synthesize cyclopentenones.

@article{Shu2009PalladiumcatalyzedRC,
  title={Palladium-catalyzed regioselective cyclopropanating allenylation of (2,3-butadienyl)malonates with propargylic carbonates and their application to synthesize cyclopentenones.},
  author={Wei Ping Shu and Guochen Jia and Shengming Ma},
  journal={Organic letters},
  year={2009},
  volume={11 1},
  pages={117-20}
}
An efficient and highly regioselective route to synthesize polysubstituted 1,3,4-alkatrien-2-yl cyclopropane derivatives via Pd(0)-catalyzed highly regioselective coupling cyclization of (2,3-butadienyl)malonate or bis(phenylsulfonyl)methane with propargylic carbonates was reported. The reaction proceeded smoothly under neutral conditions to afford the products in 73-96% yields. The products may be efficiently converted to cyclopentenone derivatives via a catalytic Pauson-Khand reaction under… CONTINUE READING

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