Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA.
Bioorg Med Chem Lett. 2010 Feb 1;20(3):935-8. doi: 10.1016/j.bmcl.2009.12.064. Epub 2009 Dec 23.
Synthesis, radioligand binding and molecular modeling studies of several 9-aminomethyl-9,10-dihydroanthracene (AMDA) analogs were carried out to determine the extent of the steric tolerance associated with expansion of the tricyclic ring system and amine substitution at 5-HT(2A) and H(1) receptors. A mixture of (7,12-dihydrotetraphene-12-yl)methanamine and (6,11-dihydrotetracene-11-yl)methanamine in a 75-25% ratio was found to have an apparent K(i) of 10nM at the 5-HT(2A) receptor. A substantial binding affinity for (7,12-dihydrotetraphene-3-methoxy-12-yl)methanamine at the 5-HT(2A) receptor (K(i)=21 nM) was also observed. Interestingly, this compound was found to have 100-fold selectivity for 5-HT(2A) over the H(1) receptor (K(i)=2500 nM). N-Phenylalkyl-AMDA derivatives, in which the length of the alkyl chain varied from methylene to n-butylene, were found to have only weak affinity for both 5-HT(2A) and H(1) receptors (K(i)=223 to 964 nM). Our results show that large rigid annulated AMDA analogs can be sterically accommodated within the proposed 5-HT(2A) binding site.
合成、放射性配体结合和分子建模研究了几种 9-氨甲基-9,10-二氢蒽(AMDA)类似物,以确定三环系统扩展和 5-HT(2A)和 H(1)受体上的胺取代所带来的空间位阻容忍度。发现(7,12-二氢四苯-12-基)甲胺和(6,11-二氢四苯-11-基)甲胺的混合物以 75-25%的比例在 5-HT(2A)受体上具有 10 nM 的表观 K(i)。还观察到(7,12-二氢四苯-3-甲氧基-12-基)甲胺在 5-HT(2A)受体上具有相当大的结合亲和力(K(i)=21 nM)。有趣的是,发现该化合物对 5-HT(2A)受体具有 100 倍的选择性,对 H(1)受体的选择性(K(i)=2500 nM)。N-芳基烷基-AMDA 衍生物中,烷基链的长度从亚甲基变化到正丁烯,发现对 5-HT(2A)和 H(1)受体的亲和力都很弱(K(i)=223 至 964 nM)。我们的结果表明,大的刚性稠合 AMDA 类似物可以在拟议的 5-HT(2A)结合位点内容纳。