transition‐metal catalysis. Unlike all known helical phosphines used so far in catalysis, the phosphorus function of phosphahelicenes is embedded in the helical structure itself. This crucial structural feature originates unprecedented catalytic behaviors and efficiency. An appropriate design and fine tuning allowed both high catalytic activity and good enantiomeric excesses to be attained in the gold promoted
Enantioselective Synthesis of 1‐Aryl Benzo[5]helicenes Using BINOL‐Derived Cationic Phosphonites as Ancillary Ligands
作者:Pablo Redero、Thierry Hartung、Jianwei Zhang、Leo D. M. Nicholls、Guo Zichen、Martin Simon、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.202010021
日期:2020.12.21
The synthesis of unprecedented BINOL‐derived cationic phosphonites is described. Through the use of these phosphanes as ancillary ligands in AuI catalysis, a highly regio‐ and enantioselective assembly of appropriately designed alkynes into 1‐(aryl)benzo[5]carbohelicenes is achieved. The modularsynthesis of these ligands and the enhanced reactivity that they impart to AuI‐centers after coordination