We discovered a facile rearrangement of N-(hetero)aryl 2-imidazolines into diversely substituted imidazo[4,5-b]pyridines and benzimidazoles, under Bechamp reduction conditions. Combined with the earlier reported protocol for Pd-catalyzed (hetero)arylation of 2-imidazolines, it provides a simple two-step access to a range of compounds based on these medicinally important heterocyclic cores. (C) 2013 Elsevier Ltd. All rights reserved.
Pd-Catalyzed N-arylation of 2-imidazolines Provides Convenient Access to Selective Cyclooxygenase-2 Inhibitors
作者:Mikhail Krasavin
DOI:10.2174/1570178611310040002
日期:2013.5.1
The re-emergence, in the recent years, of cyclooxygenase as a biological target in therapeutic areas other than
inflammation is likely to require new optimized leads, particularly suited for the requirements of specific drug development
programs. We developed a convenient synthesis of the known imidazole-based selective COX-2 inhibitors bearing
primary sulphonamide and methyl sulfone substituents, via Pd-catalyzed imidazoline N-arylation as a key step, followed
by dehydrogenation.