Asymmetric Catalysis of the [5 + 2] Cycloaddition Reaction of Vinylcyclopropanes and π-Systems
作者:Paul A. Wender、Lars O. Haustedt、Jaehong Lim、Jennifer A. Love、Travis J. Williams、Joo-Yong Yoon
DOI:10.1021/ja058590u
日期:2006.5.1
our studies of metal-catalyzed [m + n (+...o)] cycloadditions, we have previously reported the rhodium-catalyzed [5 + 2] cycloaddition of vinylcyclopropanes (VCPs) and pi-systems. These studies have led to Rh(I) complexes that catalyze these reactions in minutes at room temperature or in water without organic solvents. We describe a comparative evaluation of several chiral catalysts for the [5 + 2]
An efficient Rh-catalyst system for the intramolecular [4+2] and [5+2] cycloaddition reactions
作者:Bin Wang、Ping Cao、Xumu Zhang
DOI:10.1016/s0040-4039(00)01432-5
日期:2000.10
A new Rh-catalyst system has been developed for the [4+2] and [5+2] cycloadditionreactions. This new system shows high reactivity at room temperature and the Rh-center bears tunable phosphine ligands. Up to 1000 turnovers have been obtained for the [4+2] cycloadditionreaction at room temperature.
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.
A rhodium catalyst is reported that catalyzes the cycloisomerization of dieneynes and trienes. This cycloisomerization reaction, formally the equivalent of an unactivated Diels-Alder reaction, proceeds at room temperature with [Rh(DIPHOS)(CH2Cl2)(2)] SbF6 as the catalyst. (C) 1998 Elsevier Science Ltd. All rights reserved.
A New and Selective Catalyst for the [5 + 2] Cycloaddition of Vinylcyclopropanes and Alkynes