Phloroglucinol based podands, versatile tripodal ligands
作者:Gilles Ulrich、Sébastien Bedel、Claude Picard
DOI:10.1016/s0040-4039(02)02213-x
日期:2002.12
The synthesis of four phloroglucinol based podands is described. Ligands 4 and 5 have three bipyridine arms and an induced octahedral cavity ideal for transition metal complexation. The iron(II) complex of 4 is described. Tripodes 6 and 7 possess three bipyridine-carboxylate arms, and are designed for the encapsulation of luminescent lanthanide salts. Some preliminary optical properties of the corresponding Eu3+ and Tb3+ are presented. (C) 2002 Elsevier Science Ltd. All rights reserved.
Carboxylate Derivatives of Oligopyridines Bearing Bromomethyl Groups
The synthesis of various oligopyridines possessing a carboxylate and at least one bromoethyl group is reported. The bipyridine and terpyridine cores were constructed in good yields via a Stille cross-coupling, starting from bromopicolines and ethyl bromopicolinate. The bromomethyl function was obtained by free radical bromination using NBS in benzene or bromine in benzene/water biphasic mixture. The building of two model podands by nucleophilic displacement of benzylic bromine by an amine or by a phenol group is described.