Beilstein J. Org. Chem.2011,7, 944–950, doi:10.3762/bjoc.7.105
utilization of gold(I)/chiralphosphine catalysts for the construction of noncentrochirality [45][46][47].
Experimental
General: 1H NMR spectra were recorded at 300 MHz (JEOL AL 300). 13C NMR spectra were obtained with complete proton decoupling at 75 MHz (JEOL AL 300). HRMS data were obtained on a Bruker
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Graphical Abstract
Scheme 1:
Cationic gold(I)/PPh3-complex catalyzed intramolecular hydroalkenylation of alkynes.
Beilstein J. Org. Chem.2011,7, 555–564, doi:10.3762/bjoc.7.64
NHC–Au(I) complex (S)-6a was consequently investigated as the catalyst in the asymmetric intramolecular hydroamination of allenes. This reaction has been achieved with high enantioselectivity by a chiralphosphine–Au(I) complex [87][88][89][90][91][92][93]. Treatment of allene 11 with (S)-6a and
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Graphical Abstract
Figure 1:
Monodentate NHCs with sterically hindered N-substituents.