An efficient synthesis of highly potent and selective acetylcholinesterase (AChE) inhibitors, bis-tacrines and their isosteres 2-4, has been accomplished by bis-amination of 9-chloro-tetrahydroacridine (9a) and its analogs. The critical intermediates were concisely prepared in situ by heating the corresponding ortho-amino aromatic acids and cycloketones in the presence of phosphorus oxychloride. (C) 2000 Elsevier Science Ltd. All rights reserved.
An efficient synthesis of highly potent and selective acetylcholinesterase (AChE) inhibitors, bis-tacrines and their isosteres 2-4, has been accomplished by bis-amination of 9-chloro-tetrahydroacridine (9a) and its analogs. The critical intermediates were concisely prepared in situ by heating the corresponding ortho-amino aromatic acids and cycloketones in the presence of phosphorus oxychloride. (C) 2000 Elsevier Science Ltd. All rights reserved.