We designed and synthesized novel N-substituted 7-azaindoline derivatives as selective M1 and M4 muscarinic acetylcholine receptors (mAChRs) agonists. Hybridization of compound 2 with the HTS hit compound 5 followed by optimization of the N-substituents of 7-azaindoline led to identification of compound 1, which showed highly selective M1 and M4 mAChRs agonistic activity, weak human ether-a-go-go related
N,N-Dimethylcarbamoylation of the anilinic nitrogen atom N(1) on the Spiro 7-azaindoline consists of two steps. The first step is N,N-dimethylcarbamoylation of the pyridyl nitrogen atom N(7), leading to the formation of an isolable intermediate. The second step is intermolecular migration of the N,N-dimethylcarbamoyl group from the pyridyl nitrogen atom N(7) to the anilinic nitrogen atom N(1). We accomplished optimization of the reaction conditions based on the revealed reaction mechanism and a large scale synthesis of compound 3 in quantitative yield. (c) 2013 Elsevier Ltd. All rights reserved.
Process Development for the Synthesis of a Selective M<sub>1</sub> and M<sub>4</sub> Muscarinic Acetylcholine Receptors Agonist
A practical and chromatography-free synthetic process to selective M1 and M4muscarinic acetylcholine receptors agonist was developed and demonstrated on a several hundred gram scale. The key feature of this route is N,N-dimethylcarbamoylation of the anilinic nitrogen on the spiro 7-azaindoline structure via intermolecular migration of the N,N-dimethylcarbamoyl group. The resulting compound 1 was prepared