Journal
CCS CHEMISTRY
Volume 3, Issue 12, Pages 377-387Publisher
CHINESE CHEMICAL SOC
DOI: 10.31635/ccschem.021.202000725
Keywords
axial chirality; biaryls; Catellani reaction; atroposelectivity; biaryl monophosphine oxides
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Funding
- National Natural Science Foundation of China [21772046, 2193103]
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This study successfully established an unprecedented atroposelective Catellani reaction between phosphine oxide-containing aryl bromides, aryliodides, and nucleophiles for the construction of phosphine-containing biaryl atropisomers, showing promising synthetic utility and potential for further applications.
An unprecedented atroposelective Catellani reaction between phosphine oxide-containing aryl bromides, aryliodides, and nucleophiles for the construction of phosphine-containing biaryl atropisomers was established using an enantiopure norbornene derivative as the chiral mediator. A broad range of atropisomeric biaryl-based monophosphine oxides were obtained in good efficiency with excellent enantioselectivity. This set of three component catalytic systems successfully inhibited two-component cross-couplings and promoted the formation of an aryl-aryl chiral axis via a key atropisomeric Pd intermediate. Meanwhile, an optically active atropisomeric biaryl with two stereogenic axes was also obtained with this strategy. The synthetic utility of this methodology was illustrated through further transformations into monophosphine ligands which have been used for further applications in asymmetric catalysis. In addition, a detailed mechanism study by DFT calculation was conducted. [GRAPHICS] .
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