我们最近报道,外消旋5,11-顺二乙基-5,6,11,12-四氢丙烯-2,8-二醇(THC,rac-2b)充当雌激素受体α(ERalpha)的激动剂和雌激素受体β(ERbeta)的完全拮抗剂(Sun et al。Endocrinology 1999,140,800-804)。为了进一步研究这种新颖的ER亚型选择性雌激素活性,我们合成了一系列顺式和反式二烷基四氢大麻酚。通过对映体纯的α-烷基-β-芳基丙酸酯的酰基糊精缩合,然后在温度下,在路易斯酸介导的双环化下,以高度对映和非对映选择性的方式制备顺式-二甲基,-二乙基和-二丙基THC 2a-c。最小差向异构的条件。ERalpha和ERbeta的顺式和反式异构体的二甲基,二乙基,在竞争性结合试验中测定了二丙基四氢大麻酚的含量,在哺乳动物细胞中通过报道基因测定了它们的转录活性。发现几乎所有检查的THC对ERbeta都具有亲和力。所有这些THC都是
我们最近报道,外消旋5,11-顺二乙基-5,6,11,12-四氢丙烯-2,8-二醇(THC,rac-2b)充当雌激素受体α(ERalpha)的激动剂和雌激素受体β(ERbeta)的完全拮抗剂(Sun et al。Endocrinology 1999,140,800-804)。为了进一步研究这种新颖的ER亚型选择性雌激素活性,我们合成了一系列顺式和反式二烷基四氢大麻酚。通过对映体纯的α-烷基-β-芳基丙酸酯的酰基糊精缩合,然后在温度下,在路易斯酸介导的双环化下,以高度对映和非对映选择性的方式制备顺式-二甲基,-二乙基和-二丙基THC 2a-c。最小差向异构的条件。ERalpha和ERbeta的顺式和反式异构体的二甲基,二乙基,在竞争性结合试验中测定了二丙基四氢大麻酚的含量,在哺乳动物细胞中通过报道基因测定了它们的转录活性。发现几乎所有检查的THC对ERbeta都具有亲和力。所有这些THC都是
5,6,11,12-Tetrahydrochrysenes: synthesis of rigid stilbene systems designed to be fluorescent ligands for the estrogen receptor
作者:Kwang Jin Hwang、James P. O'Neil、John A. Katzenellenbogen
DOI:10.1021/jo00030a039
日期:1992.2
We have prepared a series of tetrahydrochrysenes as fluorescent ligands for the estrogen receptor. The stilbene chromophore in this tetracyclic system is held rigid and is adorned with an electron-donating hydroxyl group at C-8 that corresponds to the phenolic hydroxyl of estrogens and an electron acceptor at C-2 to give a donor-acceptor fluorophore. Additional substituents at C-5 and C-11 provide additional bulk that improves receptor binding affinity without distorting the planar conjugated system. The tetrahydrochrysene core was prepared by an acyloin condensation of alpha-alkyl m-methoxyhydrocinnamate esters, followed by a double dehydrative cyclization. The cis and trans isomers of the alkyl substituted systems could be separated and their stereochemistry ascertained by X-ray crystallographic analysis; the trans isomer has the higher receptor binding affinity, and the derivative with ethyl substituents at C-5 and C-11 has the best affinity. The donor-acceptor systems were prepared by functional group manipulations on one of the aromatic methoxy groups: conversion to the trifluoromethanesulfonate was followed by a palladium-mediated carbonylation to give the acetyl derivative and methoxycarbonylation to give the ester. The ester was further elaborated to the amide and nitrile. The nitro compound was prepared by nitration of protio system, itself prepared by hydrogenolysis of the trifluoromethanesulfonate. As will be described later, these tetrahydrochrysenes provide a favorable combination of estrogen receptor binding affinity and long wavelength, high quantum yield fluorescence to make them useful as fluorescent ligands for the estrogen receptor.