Palladium-catalyzed synthesis of 1,3,4-alkatrien-2-yldihydrofurans from 2,3-allenylacetylacetates and propargylic carbonates and their application to synthesize polysubstituted dihydrofurylcyclopentenones
作者:Wei Shu、Shengming Ma
DOI:10.1016/j.tet.2010.02.030
日期:2010.4
and regioselective palladium(0)-catalyzed coupling–cyclization reaction of 2-(2′,3′-allenyl)acetylacetates with propargylic carbonates was reported. The reaction proceeded smoothly underneutralconditions, affording the O-attacked five-membered products with a 1,3,4-trienyl substituent exclusively in good to excellent yields. The products can be efficiently applied to the synthesis of polysubstituted
Palladium-Catalyzed Regioselective Cyclopropanating Allenylation of (2,3-Butadienyl)malonates with Propargylic Carbonates and Their Application to Synthesize Cyclopentenones
作者:Wei Shu、Guochen Jia、Shengming Ma
DOI:10.1021/ol802465k
日期:2009.1.1
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 ambient conditions.