3 beta-Amino compounds with 17 beta-(3-furyl) and (4-pyridazinyl) ring systems were prepared from digitoxigenin 1b and found to have similar cardiotonic properties to the analogous 3 beta-hydroxy compounds when tested in the isolated guinea-pig atrial preparation. Derivatives with 3 alpha-acetoxy functions were found to have higher than expected activities. Particularly potent was the pyridazine N1-oxide
由
洋地黄毒苷1b制备了具有17个β-(3-
呋喃基)和(4-
哒嗪基)环系统的3个β-
氨基化合物,当在分离的豚鼠中进行测试时,发现它们具有与类似的3个β-羟基化合物相似的强心剂。心房准备。发现具有3个α-乙酰氧基官能团的衍
生物具有比预期更高的活性。特别有效的是
哒嗪N 1-氧化物19。所有异心烯内酯和不饱和酸酐18都没有活性。