A new methodology permitting the chlorination of different alpha-methylated nitrogen containing heterocycles into N-alpha-trichloromethylated derivatives is described here. The combination of microwave technology with a PCl5/POCl3 protocol has allowed to reach trichloromethyl derivatives with high yields in a few minutes. (c) 2006 Elsevier Ltd. All rights reserved.
Methods of preparation of 2-trihalogenomethyl-benzimidazoles, -benzothiazoles, and -benzoxazoles have been investigated. It has been shown that the reaction of the mono-salts of o-phenylenediamines, o-aminophenols, and o-aminothiophenols with trichloroacetonitrile or trichloroacetimidate esters affords 2-trichloromethyl substituted benzimidazoles, benzoxazoles, and benzothiazoles. This method has been
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
FLUORINATING AGENT, PROCESS FOR PRODUCING THE SAME, AND USE THEREOF
申请人:Mitsui Chemicals, Inc.
公开号:EP1072576A1
公开(公告)日:2001-01-31
The invention disclose a hydrogen fluoride containing composition comprising hydrogen fluoride and a compound which is liquid in the standard state (25 °C, 1 atmosphere) and has a boiling point of 120 °C or more and pka of 12 or more at 25 °C, and use of the composition for a fluorination agent.
The compound which can be preferably used is represented by the formula (1):
wherein R1 to R4 are a substituted or unsubstituted alkyl or aryl group and can be the same or different, and R1 or R2 or R3 and R4 can bond to form a ring having a nitrogen atom or a nitrogen atom and other hetero atom, or R1 and R3 can bond to form a ring having a nitrogen atom or a nitrogen atom and other hetero atom.
The fluorination agent of the invention exerts effect with a similar reaction mechanism to hydrogen fluoride, can be applied to the halogen exchange reaction of a halogen containing organic compound, and can produce a fluorine containing compound with safety and ease without specific equipment or technique.
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.
HORI M.; KATAOKA T.; SHIMIZU H.; IMAI Y., CHEM. AND PHARM. BULL., 1979, 27, NO 9, 1973-1981