Isoxazole derivatives as centrally acting muscle relaxants. III. Synthesis and activity of conformationally restricted analogs.
作者:TOCHIRO TATEE、KAZUHISA NARITA、SHUJI KURASHIGE、SHINJI ITO、HIROSHI MIYAZAKI、HIROSHI YAMANAKA、MICHINAO MIZUGAKI、TAKAO SAKAMOTO、HIDEOMI FUKUDA
DOI:10.1248/cpb.35.3676
日期:——
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 muscle-relaxant and anticonvulsant activities comparable with those of corresponding acyclic derivatives, i.e. 3-diethylamino-2-methyl-N- (3-phenyl-5-isoxazolyl) propanamides (1e-g), but other types of compounds showed decreased activities. The preferred conformation of the present isoxazole derivatives for muscle-relaxant activity is discussed. 7-Benzyl-6-methyl-3-phenyl-4-pyrrolidino-4, 5, 6, 7-tetrahydroisoxazolo [5, 4-b] pyridine (3d) showed moderate central nervous system-depressant activity.
制备了肌松药3-氨基-2-甲基-N- (3-苯基-5-异恶唑基)丙酰胺 (1) 和5- (3-氨基丙氨基) -3-苯基异恶唑 (2) 的构象限制性类似物,并测定了其肌松及其它药理活性,并与相应的无环衍生物进行了比较。7- (3-二乙氨基-2-甲基丙酰基) -3-苯基-4, 5, 6, 7-四氢异恶唑并 [5, 4-b] 吡啶 (8) 显示与相应无环衍生物、即3-二乙氨基-2-甲基-N- (3-苯基-5-异恶唑基)丙酰胺 (1e-g) 相当的肌松及抗惊活性,而其它类型的化合物则活性降低。对本异恶唑衍生物的肌松活性优势构象进行了讨论。7-苄基-6-甲基-3-苯基-4-吡咯烷基-4, 5, 6, 7-四氢异恶唑并 [5, 4-b] 吡啶 (3d) 显示中度中枢神经系统抑制活性。