Enantioselective Synthesis of C2-Symmetric Spirobipyridine Ligands through Cationic Rh(I)/Modified-BINAP- Catalyzed Double [2 + 2 + 2] Cycloaddition
摘要:
Enantioenriched C-2-symmetric spirobipyridine ligands were efficiently synthesized through a cationic rhodium(I)/(R)-Segphos or (R)-H-8-BINAP complex-catalyzed enantioselective intramolecular double [2 + 2 + 2] cycloaddition of bis-diynenitriles.