Conformationally restricted analogs of muscle-relaxant 3-amino-2-methyl-N-(3-phenyl-5- isoxazolyl) propanamides (1) and 5-(3-aminopropylamino)-3-phenylisoxazoles (2) were prepared, and their muscle-relaxant and other pharmacological activities were tested and compared with those of the corresponding acyclic derivatives. 7-(3-Diethylamino-2- methylpropanoyl)-3-phenyl-4, 5, 6, 7-tetrahydroisoxazolo [5, 4-b] pyridine (8) exhibited ...