Synthesis and substance P receptor binding activity of androstano[3,2- b]pyrimido[1,2-a]benzimidazoles

Article abstract of DOI:10.1021/jm00080a025

Several heterosteroids containing a dihydroethisterone skeleton were prepared and shown to displace substance P in a receptor binding assay. Further biochemical (kinetic and Scatchard analyses) and pharmacological evaluation (substance P-induced plasma extravasation and salivation in the rat) of a representative example in this series (5a) established that these compounds are competitive antagonists at the substance P receptor.