Synthesis of a constrained ligand comprising carboxylate and amine donor groups via direct 1,8-functionalization of positionally protected fluorene
作者:Dirk Burdinski、Karen Cheng、Stephen J. Lippard
DOI:10.1016/j.tet.2004.10.111
日期:2005.2
The synthesis of 1,8-bis(dimethylaminomethylethynyl)-3,6-di(tert-butyl)fluorene-9-yl-acetic acid, a potentially dinucleating ligand containing two N-donor and bridging carboxylate groups, is described. The electronically disfavored 1,8-disubstitution of the fluorene ring system was achieved by using tert-butyl protecting groups in the 3- and 6-positions of the fluorene molecule in combination with