Abstract

Both enantiomers of 2, 3, and 4, three bioactive analogs of muscarinic agonist BGT-A were prepared respectively and underwent functional studies and radioreceptor binding assays. 6 S enantiomers of 2, 3, and 4 showed obvious muscarinic activity, while 6 R ones elicited little muscarinic activity by functional studies. Besides, the affinity of 6 S enantiomers of 2, 3, and 4 was greatly larger than that of their 6 R enantiomers respectively. All these pharmalogical results indicated the 6 S configuration was beneficial for the active BGT-A analogs to bind with the muscarinic receptors. The finding was in good agreement with our previous SAR study to BGT-A and its active analogs by computational approach. The understanding to the relationship between muscarinic activity and absolute configuration will provide the basis for successive screening of BGT-A analogs as effective muscarinic agonists or antagonists in clinical use.

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