Optically active dinuclear palladium complexes containing a Pd−Pd bond were prepared by using (R,R)-bis(tert-butylmethylphosphino)methane ((R,R)-t-Bu-MiniPHOS). The dinuclear palladium complexes coupled with silver triflate exhibited good to excellent enantioselectivities up to 99% in palladium-catalyzed alkylative ring-openingreactions of azabenzonorbornadienes.
Combination of Cp*Rh
<sup>III</sup>
‐Catalyzed C−H Activation and a Wagner–Meerwein‐Type Rearrangement
作者:Xiaoming Wang、Andreas Lerchen、Tobias Gensch、Tobias Knecht、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201610117
日期:2017.1.24
A combination of Cp*RhIII‐catalyzed C−H activation and Wagner–Meerwein‐type rearrangement was successfully achieved for the first time. Thus, bridged polycyclic molecules that are not readily accessible by other means were accessed under mild conditions with high efficiency (as low as 0.5 mol % Rh catalyst) in the coupling of N‐phenoxyacetamide with 7‐azabenzonorbornadiene.
A screening method for asymmetric catalysts is reported in which a metal-containing optically-active product of an asymmetric reaction is employed as a chiral catalyst in another asymmetric reaction; the rapid preparation and instant testing system of catalysts resulted in a considerable reduction in the time required for the screening process.