Studies on chemical carcinogens. XXIII. A simple method for characterization of the alkylating ability of compounds by using 4-(p-nitrobenzyl)pyridine.
describe Rh-catalyzed electrophilicamination of substituted isoxazolidin-5-ones for the synthesis of unprotected, cyclic β-amino acids featuring either benzo-fused or spirocyclic scaffolds. Using the cyclic hydroxylamines allows for retaining both nitrogen and oxygen functionalities in the product. The traceless, redox neutral process proceeds on a gram scale with as little as 0.1 mol% catalyst loading. In
亲电胺化涉及氮原子的 umpolung,提供了另一种独特的合成策略。最近出现的各种设计的 O 取代羟胺显着推进了这一研究领域。一个被低估的问题是转化的原子经济性:氧原子上必要的活化基团留在了共同产生的废物中。在此,我们描述了取代的异恶唑烷-5-酮的 Rh 催化亲电胺化,用于合成未受保护的环状 β-氨基酸,其特征是苯并稠合或螺环支架。使用环状羟胺可以保留产品中的氮和氧官能团。无痕氧化还原中性过程以克规模进行,催化剂负载量低至 0.1 mol%。与文献中的相关亲电胺化相比,一系列机械实验表明了一种独特的途径,包括螺环化,然后是骨架重排。本文提供的见解阐明了活性物质(由活化的羟胺生成的 Rh-nitrenoid)的细微反应,并扩展了亲电芳香取代的知识。
Antagonists of the Human A<sub>2A</sub> Adenosine Receptor. 4. Design, Synthesis, and Preclinical Evaluation of 7-Aryltriazolo[4,5-<i>d</i>]pyrimidines
作者:Roger J. Gillespie、Samantha J. Bamford、Ruth Botting、Mike Comer、Sarah Denny、Suneel Gaur、Michael Griffin、Allan M. Jordan、Anthony R. Knight、Joanne Lerpiniere、Stefania Leonardi、Sean Lightowler、Steven McAteer、Angela Merrett、Anil Misra、Antony Padfield、Mark Reece、Mona Saadi、Daniel L. Selwood、Gemma C. Stratton、Dominic Surry、Richard Todd、Xin Tong、Vicki Ruston、Rebecca Upton、Scott M. Weiss
DOI:10.1021/jm800961g
日期:2009.1.8
therapeutic intervention in the alleviation of the symptoms associated with Parkinson’sdisease. This is thought to occur, at least in part, by increasing the sensitivity of the dopaminergic neurons to the residual, depleted levels of striatal dopamine. We herein describe a novel series of functionalized triazolo[4,5-d]pyrimidine derivatives that display functional antagonism of the A2A receptor. Optimization
人类A 2A受体的拮抗作用被认为是减轻与帕金森氏病有关的症状的治疗干预点。认为这至少部分地通过增加多巴胺能神经元对残留的,耗尽的纹状体多巴胺水平的敏感性而发生。我们在此描述了一系列新颖的功能化的三唑并[4,5- d ]嘧啶衍生物,其显示出对A 2A受体的功能拮抗作用。这些化合物的优化已导致关键衍生物的效能,选择性和药代动力学特性得到改善。这些努力导致发现了60(V2006 / BIIB014),其在帕金森氏病的常用模型中证明了强烈的口服活性。此外,该衍生物已显示出优异的临床前药代动力学,并已成功完成I期临床研究。目前,该化合物正在与Biogen Idec合作进行进一步的临床评估。
Halogenolysis of Benzylcobaloximes
作者:B. D. Gupta、Manoj Kumar
DOI:10.1246/cl.1987.701
日期:1987.4.5
The reaction of substituted benzylcobaloximes p-RC6H4CH2Co(dmgH)2Py (R = OMe, NHCOCH3 and NMe2) and m-RC6H4CH2Co(dmgH)2Py (R = Me, OMe) with halogens (Cl2 and Br2) in chloroform under nitrogen forms ring substituted organic and organometallic products.
Synthesis and Application of a New Fluorous-Tagged Ammonia Equivalent
作者:Simon D. Nielsen、Garrick Smith、Mikael Begtrup、Jesper L. Kristensen
DOI:10.1002/chem.200903178
日期:2010.4.19
A novel fluorous‐tagged ammoniaequivalent has been developed. It is based on a nitrogen–oxygen bond, which can be cleaved in a traceless manner by a molybdenum complex or samarium diiodide. The application in the synthesis of ureas, amides, sulfonamides, and carbamates is described. The scope of the fluorous NO linker is exemplified by the synthesis of itopride, a drug used for the treatment of functional
2-[4-(P-Aminobenzyl)-1-piperazinyl]-8-ethyl-5,8-dihydro-5-oxopyrido-[2,3-d] pyrimidine-6-carboxylic acid, and its pharmaceutically acceptable salt. This novel compound can be prepared by reacting a compound of the formula ##STR1## wherein R is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, with a compound of the formula ##STR2## wherein R.sub.1 is an amino group or a group convertible to the amino group, and X is a reactive moiety capable of splitting off together with the hydrogen atom at the 4-position of the 1-piperazinyl group of the compound of the formula (II). Pharmaceutical compositions containing aforesaid compounds as active ingredients are useful for treating a bacterial infection of man and other warm-blooded animals.