One-Step Synthesis of Nitrogen-Containing Medium-Sized Rings via α-Imino Diazo Intermediates
摘要:
Eight- and 9-membered dioxazocines and dioxazonines are readily synthesized starting from N-sulfonyl-1,2,3-triazoles in a single-step procedure. A perfect regioselectivity and generally good yields (up to 92%) are obtained under dirhodium catalysis using 1,3-dioxolane and 1,3-dioxane as solvents and reagents.
Nickel-Catalyzed Coupling of <i>N</i>-Sulfonyl-1,2,3-triazole with <i>H</i>-Phosphine Oxides: Stereoselective and Site-Selective Synthesis of α-Aminovinylphosphoryl Derivatives
nickel-catalyzed coupling of N-sulfonyl-1,2,3-triazole with various H-phosphine oxides for the construction of C(sp2)–P bonds is established. This unexpected reaction proceeds through a formal nickel-bound ketenimine pathway, representing a previously unknown 1,2-reactivity type of an azavinyl carbene. The method provides an efficient approach to the stereoselective and site-selective synthesis of α-aminovinylphosphoryl