Identification and characterization of m4 selective muscarinic antagonists

Article abstract of DOI:10.1016/S0960-894X(98)00351-5

Our interest in the area of m4 muscarinic antagonists has led us to study a series of benzoxazine isoquinolines. One of the most potent and selective compounds of this series is example 1 with an IC₅₀ value of 90.7nM at m4 receptors, and 72-fold (m1), 38-fold (m2), 10-fold (m3), and 82- fold (m5) more selective compared to the other receptors. The synthesis and receptor binding affinity of analogs of 1 are reported.