CoMFA Study of Novel Phenyl Ring-Substituted 3α-(Diphenylmethoxy)tropane Analogues at the Dopamine Transporter
摘要:
A series of phenyl ring-substituted analogues of 3 alpha-(diphenylmethoxy)tropane (benztropine) has been prepared as novel probes for the dopamine transporter. Cross-validated comparative molecular field analysis (CoMFA) models of the binding domain on the dopamine transporter were constructed using 37 geometry-optimized structures of these compounds and their corresponding binding affinities (Ki values) for the displacement of [H-3]WIN 35,428 or potency of [H-3]dopamine uptake inhibition (IC50 values) in rat caudate putamen tissue. The most predictive model (q(2) = 0.78) correlated the steric component of CoMFA to the dependent variable of [H-3]WIN 35,428 binding affinities. A novel series of seven phenyl ring-substituted analogues of 3a-(diphenylmethoxy)tropane was prepared, and our best molecular model was used to accurately predict their binding affinities. This study is the first to provide a CoMFA model for this class of dopamine uptake inhibitors. This model represents an advancement in the design of novel dopamine transporter ligands, based on 3a-(diphenylmethoxy)tropane, and further substantiates structure-activity relationships that have previously been proposed for this class of compounds. This CoMFA model can now be used to predict the binding affinities of novel 3a-(diphenylmethoxy)tropane analogues at the dopamine transporter and will be useful in the design of molecular probes within this class of dopamine uptake inhibitors.
Abstract Triflic acid (TfOH) has been proven to be effective as a tolerant acidic mediator in electrophilic aromatic aroylation with CF3‐bearing aroyl chlorides. The TfOH‐mediated aroylation of fluorobenzene proceeds with high selectivity to give CF3‐bearing aryl fluorophenyl ketones in good yields, which are hardly obtained with the aid of AlCl3 or direct condensation reagents.
A novel Brønsted acid catalyst for Friedel–Crafts acylation
作者:Anna G. Posternak、Romute Yu. Garlyauskayte、Lev M. Yagupolskii
DOI:10.1016/j.tetlet.2008.11.038
日期:2009.1
Bis(trifluoroalkylsulfonylimino)trifluoromethanesulfonic acid has demonstrated remarkable catalytic ability in the electrophilic acylation of aromatic substrates. Various perfluoroalkyl substituted aroyl chlorides are employed in Friedel–Crafts acylation typically using 1 mol % of catalyst.