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■ Macrobicyclic and Macrotricyclic Derivatives of N,N’,N’’,N’’’-Tetrasubstituted Cyclen and Cyclam

Sergei M. Kobelev, Alexei D. Averin, Alexei K. Buryak, Andrei I. Vovk, Valerii P. Kukhar, Franck Denat, Roger Guilard, and Irina P. Beletskaya*

*Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119991, Moscow, Russia

Abstract

N,N’N’’,N’’’-Tetrabenzyl derivatives of cyclen and cyclam possessing two bromine atoms in trans-positioned phenyl rings were introduced in the Pd-catalyzed amination reactions with oxadiamines and polyamines to provide a wide series of macrobicyclic compounds with tetrabenzyl substituted cyclen and cyclam central moieties in yields up to 31%. Macrocycles based on 1,7-dibenzylcyclen were modified with two 3-bromobenzyl substituents and introduced in the Pd-catalyzed macrocyclization with di- and trioxadiamines to afford spherically shaped macrotricyclic cryptands in yields up to 33%. An alternative approach to isomeric macrotricyclic cryptands employed Pd-catalyzed amination of di(Boc)-di(3-bromobenzyl)cyclen followed by the dialkylation of the resulting bicycle with two bromobenzyl groups and final catalytic macrocyclization step (yields up to 24%).