Journal of the American Chemical Society, Vol.133, No.39, 15372-15375, 2011
Gold-Catalyzed 1,2-Difunctionalizations of Aminoalkynes Using Only N-and O-Containing Oxidants
We report two viable routes for the 1,2difunctionalization of aminoalkynes using only oxidants. In the presence of a gold catalyst, nitrones enable the oxoamination of aminoalkynes 1 to form 2-aminoamides 2. With a suitable gold catalyst, nitrosobenzenes implement an alkyne/nitroso metathesis of the same substrates to give 2-oxoiminylamides 3. These two novel oxidations also provide 1,2-aminoalcohols with opposite regioselectivity via NaBH(4) reduction in situ.