heterocyclic-imidazoline compounds have been prepared and evaluated in vitro as imidazoline sites (I1 and I2) and alpha-adrenergic (alpha1 and alpha2) receptor ligands. Their pKi values indicate that linkage of the imidazoline moiety at the 2-position with an aromatic substituent dramatically decreases alpha-adrenergic affinity. I1 sites are more accessible by phenyl imidazolines substituted by a methyl or a methoxy
Fragmentation of Trifluoromethylated Alkenes and Acetylenes by <i>N</i>,<i>N</i>-Binucleophiles. Synthesis of Imidazolines or Imidazolidines (Oxazolidines) Controlled by Substituent
作者:Valentine G. Nenajdenko、Vasiliy M. Muzalevskiy、Aleksey V. Shastin、Elizabeth S. Balenkova、Evgeniy V. Kondrashov、Igor A. Ushakov、Alexander Yu. Rulev
DOI:10.1021/jo101107t
日期:2010.8.20
The reaction of β-halogeno-β-polyfluoromethylstyrenes with N,N- or N,O-binucleophiles leads to unexpected fragmentation products (imidazolines) or to heterocyclization giving CF3-substituted imidazolidines (N,N-) and oxazolidines (N,O-) depending on aryl substituent. The scope and the reaction mechanism are discussed.
Mazindol Analogues as Potential Inhibitors of the Cocaine Binding Site at the Dopamine Transporter
作者:William J. Houlihan、Lawrence Kelly、Jessica Pankuch、Judith Koletar、Leonard Brand、Aaron Janowsky、Theresa A. Kopajtic
DOI:10.1021/jm010302r
日期:2002.9.1
A series of mazindol. (2) and homomazindol (3) analogues with a variety of electron-donating and electron-withdrawing groups in the pendant aryl group and the benzo ring C, as well as H, methoxy, and alkyl groups replacing the hydroxyl group were synthesized, and their binding affinities at the dopamine transporter (DAT) on rat or guinea pig striatal. membranes were determined. Several active analogues were also evaluated for their ability to block uptake of DA, 5-HT, and NE and inhibit binding of [I-125] RTI-55 at HEK-hDAT, HEK-hSERT, and HEK-hNET cells. Mazindane (26) was found to be a pro-drug, oxidizing (5-H --> 5-OH) to mazindol on rat striatal membranes and HEk-hDAT cells. The 4',7,8-trichloro analogue (38) of mazindol was the I most potent and selective ligand. for HEK-hDAT cells (DAT K-i = 1.1 nM; SERT/DAT 1283 and NET/DAT = 38). Experimental results strongly favor the cyclic or ol tautomers of 2 and 3 to bind more, tightly at the DAT than the corresponding keto tautomers.
A mild and efficient one-pot synthesis of 2-dihydroimidazoles from aldehydes
作者:Hiromichi Fujioka、Kenichi Murai、Yusuke Ohba、Atsushi Hiramatsu、Yasuyuki Kita
DOI:10.1016/j.tetlet.2005.02.025
日期:2005.3
The reactions of various aldehydes and 1,2-diamines followed by NXS treatment proceed at 0 degrees C to give the corresponding dihydroimidazoles in high yields. The reaction is mild, and many functional groups such as halogens, nitrites, and esters can exist. (c) 2005 Elsevier Ltd. All rights reserved.