An inexpensive and efficient synthetic method for the preparation of pyromellitic dianhyride in ionic liquid
摘要:
In this article, pyromellitic dianhydride could be successfully obtained in 76.7% total yield by an aerobic oxidation of 1,4-bis(chloromethyl)-2,5-dimethylbenzene or 1,5-bis(chloromethyl)-2,4-dimethylbenzene catalyzed by VO(acac)(2)/Cu(2-Eth)(2)/DABCO in [hmim]OTf and a subsequent dehydration of pyromellitic acid upon heating with acetic anhydride. The starting materials including 1,2-bis(chloromethyl)-4,5-dimethylbenzene were prepared by dichloromethylation of their corresponding xylene catalyzed by [C(12)mim]Br in aqueous media.
By an example of previously uncharacterized products obtained by alkylarenes radical chlorination was demonstrated that combination of various interpretation methods applied to the retention indices (RI) in the gas chromatography on the standard nonpolar phases (comparison of RI of products and initial compounds, characteristics of succession of the chromatographic elution of the structural isomers with the use of estimation of molecular dynamic parameters, application of the additive schemes to RI calculation, and using of structural analogy CH3<----> Cl for testing the results obtained) permitted unambiguous identification of the structure even without data of mass spectrometry.
[EN] BENZIMIDAZOLE OR INDOLE AMIDES AS INHIBITORS OF PIN1<br/>[FR] AMIDES DE BENZIMIDAZOLE OU D'INDOLE EN TANT QU'INHIBITEURS DE PIN1
申请人:PFIZER
公开号:WO2006040646A1
公开(公告)日:2006-04-20
The invention relates to compounds of the formula (1) and to pharmaceutically acceptable salts and solvates thereof, wherein the variables are defined herein. The invention also relates to methods of treating abnormal cell growth in mammals by administering the compounds of formula (1) and to pharmaceutical compositions for treating such disorders that contain the compounds of formula (1). The invention also relates to methods of preparing the compounds of formula (1).
The present invention provides spiro-oxazolones, which act as V1a receptor modulators, and in particular as V1a receptor antagonists, their manufacture, pharmaceutical compositions containing them and their use as medicaments. The present compounds are useful as therapeutics acting peripherally and centrally in the conditions of inappropriate secretion of vasopressin, anxiety, depressive disorders, obsessive compulsive disorder, autistic spectrum disorders, schizophrenia, aggressive behavior and phase shift sleep disorders, in particular jetlag.
Direct Synthesis of Substituted Naphthalenes from 1,3-Dicarbonyl Compounds and 1,2-Bis(halomethyl)benzenes Including a Novel Rearrangement Aromatization of Benzo[<i>c</i>]oxepine
unexpected rearrangement aromatization of benzo[c]oxepine has been revealed to synthesize substituted naphthalenes. This observation was further exploited to develop an efficient approach for the construction of naphthalenes from simple and commercially available 1,3-dicarbonylcompounds and 1,2-bis(halomethyl)benzene compounds via a new domino reaction sequence.
苯并[ c ]氧杂环丁烷的意外重整芳构化已表明可以合成取代的萘。进一步利用这一观察结果,开发了一种有效的方法,可通过简单的和可商购的1,3-二羰基化合物和1,2-双(卤甲基)苯化合物通过新的多米诺反应序列来构建萘。
作者:Anxin Wu、Arindam Chakraborty、Dariusz Witt、Jason Lagona、Fehmi Damkaci、Marie A. Ofori、Jessica K. Chiles、James C. Fettinger、Lyle Isaacs
DOI:10.1021/jo0258958
日期:2002.8.1
Cyclic ethers 5a,d-f and 25-26 undergo highly diastereoselective dimerizationreactions to yield methylene-bridged glycoluril dimers with the formal extrusion of formaldehyde. Last, it is possible to perform selective heterodimerization reactions using both cyclic ethers and glycoluril derivatives bearing ureidyl NH groups. These reactions deliver the desired C- and S-shaped heterodimers with low to moderate
(±)-1, a recently discovered, valuable, floral-type odorant, has been synthesized by a straightforward procedure (Scheme 1). To determine the properties of the enantiomers of 1, their separation by preparative HPLC and the determination of their absolute configuration by X-ray crystallography were carried out (Figure). Furthermore, the analogues 2–6 were synthesized, either from differently methylated