(E )-N-(but-2-ynyl)-N-(3-cyclopropylallyl)-4-methylbenzenesulfonamide;(E)-N-(but-2-yn-1-yl)-N-(3-cyclopropylallyl)-p-toluenesulfonamide;N-but-2-ynyl-N-(3-cyclopropylallyl)-4-methylbenzenesulfonamid;N-but-2-ynyl-N-[(E)-3-cyclopropylprop-2-enyl]-4-methylbenzenesulfonamide
Iridium Catalyzed Carbocyclizations: Efficient (5+2) Cycloadditions of Vinylcyclopropanes and Alkynes
作者:Michaela-Christina Melcher、Henrik von Wachenfeldt、Anders Sundin、Daniel Strand
DOI:10.1002/chem.201405729
日期:2015.1.7
Third‐row transition metal catalysts remain a largely untapped resource in cycloaddition reactions for the formation of medium‐sized rings. Herein, we report the first examples of iridium‐catalyzed inter‐ and intramolecular vinylcyclopropane (VCP)–alkyne (5+2) cycloadditions. DFT modeling suggests that catalysis by iridium(I) proceeds through a mechanism similar to that previously reported for rhodium(I)‐catalyzed
Selectivity in Nickel-Catalyzed Rearrangements of Cyclopropylen-ynes
作者:Gang Zuo、Janis Louie
DOI:10.1021/ja043253r
日期:2005.4.1
The Ni/NHC-catalyzed rearrangement of cyclopropylen-ynes is described. Two different heterocycles, cyclopentane- or cycloheptene-based, were obtained. However, by employing ItBu as the NHC ligand, cyclopentane products were obtained selectively under mild conditions.