2-Trihalogenomethylbenzazoles. Part IV. Reactions with difunctional nucleophiles. Formation of heterocyclic rings on the 2-position of benzazoles
作者:B. C. Ennis、G. Holan、E. L. Samuel
DOI:10.1039/j39670000033
日期:——
1,4-difunctional nucleophiles. Similarly, aromatic ortho-disubstituted nucleophiles yielded the corresponding azole derivatives. Other heterocyclicrings on the 2-position of benzimidazole were formed in reactions with semicarbazide and mercaptoethanol. The nature and activation of the trihalogenomethyl groups in these cyclisations is discussed, and some reactions of the cyclisation products are also
Synthesis of substituted aryl amidines from aminoacetonitriles
作者:Zhiwei Yin、Zhongxing Zhang、Juliang Zhu、Henry Wong、John F. Kadow、Nicholas A. Meanwell、Tao Wang
DOI:10.1016/j.tetlet.2005.04.142
日期:2005.7
oxidized by NiO2–H2O or MnO2 in the presence of a wide range of NH2-containing compounds to afford aryl amidines, presumably via iminium intermediates. A ‘one-pot’ procedure for the preparation of heteroaryl amidinesfrom N-containing heteroaryl halides through a process comprising sequential SNAr substitution and oxidation has also been developed.
2-(4,5-Dihydroimidazol-2-yl)benzimidazoles as highly selective imidazoline I2/adrenergic α2 receptor ligands
作者:Francieszek Sączewski、Piotr Tabin、Robin J. Tyacke、Alys Maconie、Jarosław Sączewski、Anita Kornicka、David J. Nutt、Alan L. Hudson
DOI:10.1016/j.bmc.2006.05.062
日期:2006.10
2-(4,5-Dihydroimidazol-2-yl)benzimidazoles have been identified as selective imidazoline I-2/alpha(2)-adrenoceptor ligands. 4-Methyl (2) and 4-chloro (4) derivatives display 12 affinity at nanomolar concentration (K-i = 4.4 and 17.7 nM, respectively) and high I-2/alpha(2) selectivity ratio = 4226 and 5649, respectively. An evidence has been obtained that pK(a) value influences considerably the I-2/alpha(2)-selectivity ratio of this class of imidazoline 12 receptor ligands. (c) 2006 Elsevier Ltd. All rights reserved.