Palladium catalysed cascade hydrostannylation-bis-cyclisation-intramolecular anion capture. Routes to bridged- and spiro-cyclic small and macrocyclic heterocycles
Palladiumcatalysedcascade hydrostannylation of terminal alkynes in α,ω-enynes at 0–25°C followed by bis-cyclisation initiated by insertion of Pd(0) into an aryl iodide at 100–110°C and terminating in an intramolecular Stille coupling provides a wide range of exo-methylene and membered spiro- and bridged-ring heterocycles.
Palladium Catalysed Tandem Cyclisation–Anion Capture. Part 5: Cascade Hydrostannylation-bis-cyclisation-intramolecular Anion Capture. Synthesis of Bridged- and Spiro-Cyclic Small and Macrocyclic Heterocycles
作者:Adele Casaschi、Ronald Grigg、José M Sansano、David Wilson、James Redpath
DOI:10.1016/s0040-4020(00)00660-8
日期:2000.9
A series of O- and N-α,ω-enyne derivatives of 2-iodoarylethers and 2-iodoarylamides undergo palladiumcatalysedcascade hydrostannylation of the ω-alkyne moiety at 0–25°C followed by bis-cyclisation at 100–110°C terminating in intramolecular sp3–sp2 Stille coupling. These cascades provide a wide range of 5/6 and 5/12–17 membered bicyclic spiro- and bridged-ring heterocycles.