A1 Adenosine Receptor Antagonists as Ligands for Positron Emission Tomography (PET) and Single-Photon Emission Tomography (SPET)
摘要:
The high affinity of 8-cyclopentyl-1,3-dipropylxanthine (CPX) for the A(1) adenosine receptor (A(1)AR) provides a good lead for developing radioligands suitable for positron emission tomography (PET) and single-photon emission tomography (SPET). This study tested the hypothesis that the kinds of chemical modifications made in the synthesis of CPX analogues containing carbon-ii, fluorine-18, or radioiodine will not alter affinity for the A(1)AR. This report describes the synthesis and radioligand binding assays of unlabeled CPX analogues having methyl, 2-methoxyethyl, 2-fluoropropyl, or 3-fluoropropyl substituents, respectively, at either N-1 (13a-d) or N-3 (8a-d) or an (E)-3-iodoprop-2-en-1-yl substituent at N-3 (8f). Compounds 8d,f and 13b,d antagonized the binding of [H-3]CPX to the A(1)AR of rat brain with affinities similar to those of CPX; compound 8c was twice as potent as CPX. Analogues 8a,b and 13a were less potent than CPX, but for each the K-i of antagonism was greater than or equal to 0.5 nM. Attempts to iodinate the 8-(4-hydroxyphenyl) analogue of CPX failed, probably because the xanthine substituent strongly deactivated the phenol toward electrophilic iodination. In summary, several of the modifications of the propyl groups of CPX needed to produce ligands for imaging by PET and SPET preserve or enhance affinity for the A(1)AR.
我们报告了一种新的电化学无负载电解质方法,用于通过草酸氧化合成尿素、氨基甲酸酯和硫代氨基甲酸酯。这种简单、实用且无光气的路线包括在有机碱存在下通过草酸的阳极脱羧原位生成异氰酸酯中间体,然后一锅加入合适的亲核试剂以提供相应的尿素,氨基甲酸酯和硫代氨基甲酸酯。此程序适用于不同的胺、醇和硫醇。此外,当使用单程连续电化学流动条件并且该反应在碳石墨 C gr /C gr 在流动池中,可以在 6 分钟的停留时间内以高产率获得尿素化合物,解锁在批量条件下无法访问的底物,同时易于扩展。
NOVEL REVAMIPIDE PRODRUGS, PREPARATION METHOD AND USE THEREOF
申请人:SAMJIN PHARMACEUTICAL CO., LTD.
公开号:US20150141409A1
公开(公告)日:2015-05-21
Disclosed are a novel rebamipide prodrug, a method for preparing the same, and use thereof. Also, a pharmaceutical composition comprising the novel rebamipide prodrug as an active ingredient is provided. The rebamipide prodrug is increased 25-fold in absorption rate compared to rebamipide itself, and can be applied to the prophylaxis or therapy of gastric ulcer, acute gastritis, chronic gastritis, xerophthalmia, cancer, osteoarthritis, rheumatoid arthritis, or obesity.
A facile acid-assisted de-tert-butylation reaction that can instantly “turn off” the dynamicity of hindered urea bonds (HUBs) and stabilize HUB-containing structures.
[EN] INDAZOLE COMPOUNDS AS CCR1 RECEPTOR ANTAGONISTS<br/>[FR] COMPOSÉS INDAZOLE COMME ANTAGONISTES DES RÉCEPTEURS CCR1
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2009134666A1
公开(公告)日:2009-11-05
Disclosed indazoles compounds that are useful as antagonists of CCR1 activity and are thus useful for treating a variety of diseases and disorders that are mediated or sustained through the activity of CCR1 including autoimmune diseases, such as rheumatoid arthritis and multiple sclerosis. Also disclosed are pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
USE OF SUBSTITUTED 2,3-DIHYDRO-1-BENZOFURAN-4-CARBOXYLIC ACIDS OR SALTS THEREOF AS ACTIVE SUBSTANCES AGAINST ABIOTIC PLANT STRESS
申请人:Bayer CropScience AG
公开号:US20150322094A1
公开(公告)日:2015-11-12
Use of substituted 2,3-dihydro-1-benzofuran-4-carboxylic acids of the general formula (I) or salts thereof
where the radicals in the general formula (I) are as defined in the description, for increasing stress tolerance in plants with respect to abiotic stress, for enhancing plant growth and/or for increasing plant yield, and specific processes for preparing the aforementioned compounds.
the intermediate formation of the corresponding isocyanate, which, in turn, reacts further with a nucleophilic reagent also present in the mixture and results in carbamoylation with good yield. On the basis of this reaction a practical carbamoylation procedure was devised and a comparative study on suitability of different solvents and phosphorus (III) derivatives for carbamoylation reaction was conducted