Palladium-catalyzed syntheses of oxygen- and nitrogen heterocycles via transmetalation of functionalized alkynyl stannanes

[[abstract]]The reaction between CpFe(CO)(2)I, hydroxy- or aminoalkynyl stannanes, and PdCl2(CH3CN)(2) (8.0 mol. %) generates a reactive iron-alkynyl intermediate that reacts in situ with RCHO/BF3 . Et2O to yield an iron oxa- or azacarbeniums quantitatively, further producing oxygen-and nitrogen heterocycles in high yields after Me3NO-oxidation of these carbenium salts.[[fileno]]2010327010046[[department]]化學