Concave 1,10-Phenanthrolines as Ligands for Cyclopropanations - Towards a Deeper Understanding of the Stereoselectivity
作者:Friederike Eggers、Ulrich Lüning
DOI:10.1002/ejoc.200801261
日期:2009.5
Four new mono- and bimacrocyclic 1,10-phenanthrolines – 3b and 4a–c – containing aryl bridgeheads have been synthesised. The etherification of the aryl bridgeheads was accomplished by Williamson or Mitsunobu reactions. A key step in the synthesis of the macrocyclic phenanthrolines 3 and 4 is the Suzuki coupling of 2,9-diiodo-1,10-phenanthroline (12) with the appropriately substituted boronic acids