The synthesis of l-proline derived hexaazamacrocyclic ligands of C3 symmetry via intramolecular methyl ester aminolysis
作者:Michał Achmatowicz、Janusz Jurczak
DOI:10.1016/s0957-4166(01)00068-4
日期:2001.3
A convenient synthesis of enantiomerically pure 18-, 21-. and 24-membered hexaaza-crown ligands is presented. Linear alpha,omega -aminoesters, prepared from L-proline, undergo intramolecular aminolysis to afford the corresponding 18-, 21-, and 24-membered macrocyclic amides in satisfactory yields (42, 65. and 22%, respectively). These were subsequently transformed into the title macrocyclic hexamines via exhaustive reduction with a borane-dimethylsulfide complex. X-Ray structures of two larger macrocyclic amides are also presented. (C) 2001 Elsevier Science Ltd. All rights reserved.