17β-<i>O</i>-Aminoalkyloximes of 5β-Androstane-3β,14β-diol with Digitalis-like Activity: Synthesis, Cardiotonic Activity, Structure−Activity Relationships, and Molecular Modeling of the Na<sup>+</sup>,K<sup>+</sup>-ATPase Receptor
作者:Alberto Cerri、Nicoletta Almirante、Paolo Barassi、Alessandra Benicchio、Giorgio Fedrizzi、Patrizia Ferrari、Rosella Micheletti、Luisa Quadri、Enzio Ragg、Roberto Rossi、Marco Santagostino、Antonio Schiavone、Fulvio Serra、Maria Pia Zappavigna、Piero Melloni
DOI:10.1021/jm990627w
日期:2000.6.1
with a 17-aminoalkoxyiminoalkyl or -alkenyl substituent was synthesized and evaluated for inhibition of Na(+),K(+)-ATPase and for inotropic activity. The highest inhibition was found with compounds having the substituent in configuration 17beta and the amino group at a distance of 6 or 7 bonds from C(17) of the digitoxigenin skeleton. The presence of the oxime function strengthens the interaction with
合成了一系列具有17-氨基烷氧基亚氨基烷基或-烯基取代基的洋地黄样化合物,并评估了其对Na(+),K(+)-ATPase的抑制作用和正性肌力活性。在具有构型17beta的取代基且氨基距洋地黄毒苷骨架的C(17)6或7个键的距离处发现具有最高的抑制作用。肟功能的存在加强了与受体的相互作用,如果α,β-不饱和的话,则更有效,从而模仿了天然洋地黄化合物中不饱和内酯的电子状态。活性最高的化合物显示Na(+),K(+)-ATPase抑制能力(IC(50))比标准地黄毒苷原和地高辛高17-25倍,而正性肌力(EC(50))高3-11倍。孤立的豚鼠左心房。这些特征得到了分子模型的支持,该分子模型暗示了上述基团与Na(+),K(+)-ATPase的H1-H2域中特定氨基酸残基的可能相互作用。一些互动是文献中已经描述的经典互动;发现了碱性基团与Cys138的新的非常强的相互作用,为设计与受体此区域相互作用的