Improved Syntheses of 5′-S-(2-Aminoethyl)-6-N-(4-nitrobenzyl)-5′-thioadenosine (SAENTA), Analogues, and Fluorescent Probe Conjugates: Analysis of Cell-Surface Human Equilibrative Nucleoside Transporter 1 (hENT1) Levels for Prediction of the Antitumor Efficacy of Gemcitabine
摘要:
5'-S-(2-Aminoethyl)-6-N-(4-nitrobenzyl)-5'-thioadenosine (SAENTA), 5'-S-(2-acetamidoethyl)-6-N-[(4-substituted)benzyl]-5'-thioadenosine analogues, 5'-S-[2-(6-aminohexanamido)lethyl-6-N-(4-nitrobenzyl)-5'-thioadenosine (SAHENTA), and related compounds were synthesized by S(N)Ar displacement of fluoride from 6-fluoropurine intermediates with 4-(substituted)benzylamines. Conjugation of the pendant amino groups of SAENTA and SAHENTA with fluorescein-5-yl isothiocyanate (FITC) gave fluorescent probes that bound at nanomolar concentrations specifically to human equilibrative nucleoside transporter 1 (hENT1) produced in recombinant form in model expression systems and in native form in cancer cell lines. Transporter binding effects were studied and the ability of the probes to predict the potential antitumor efficacy of 2'-deoxy-2',2'-difluorocylidine (gemcitabine) was demonstrated.
seven novel NImNHP‐type pincer imidazolylphosphineruthenium complexes has been synthesized and fully characterized. The use of hydrogenation of benzonitrile as a benchmark test identified [RuHCl(CO)(NImNHPtBu)] as the most active catalyst. With its stable Ru−BH4 analogue, in which chloride is replaced by BH4, a broad range of (hetero)aromatic and aliphaticnitriles, including industrially interesting
已合成并充分表征了一系列七个新型的N Im N H P型钳型咪唑基膦膦钌配合物。使用苯甲腈加氢作为基准测试,确定了[RuHCl(CO)(N Im N H P t Bu)]是最具活性的催化剂。凭借其稳定的Ru-BH 4类似物(其中氯化物被BH 4替代),已在温和且无碱的条件下氢化了多种(杂)芳族和脂肪族腈,包括工业上有用的己二腈。
Catalytic Staudinger Reduction at Room Temperature
作者:Danny C. Lenstra、Joris J. Wolf、Jasmin Mecinović
DOI:10.1021/acs.joc.9b00831
日期:2019.5.17
catalytic Staudingerreduction at room temperature that enables the preparation of a structurally diverse set of amines from azides in excellent yields. The reaction is based on the use of catalytic amounts of triphenylphosphine as a phosphine source and diphenyldisiloxane as a reducing agent. Our catalytic Staudingerreduction exhibits a high chemoselectivity, as exemplified by reduction of azides
general hydrogenation of nitriles in the absence of basic additives is described. The system is based on the combination of [Ru(cod)(methylallyl)2] (cod=cyclooctadiene) and L2. A variety of aromatic and aliphaticnitriles is hydrogenated under mild conditions (50 °C and 15 bar H2) with this system. Kinetic studies revealed higher activity in the case of aromaticnitriles compared with aliphatic ones.
描述了一种在不存在碱性添加剂的情况下对腈进行一般氢化的新方案。该系统基于[Ru(cod)(甲基烯丙基)2 ](cod =环辛二烯)和L2的组合。使用该系统,可以在温和的条件下(50°C和15 bar H 2)对各种芳香族和脂肪族腈进行氢化。动力学研究表明,与脂族腈相比,芳族腈具有更高的活性。
作者:Danny C. Lenstra、Peter E. Lenting、Jasmin Mecinović
DOI:10.1039/c8gc02136h
日期:——
A highly efficient and sustainable catalytic Staudingerreduction for the conversion of organic azides to amines in excellent yields has been developed. The reaction displays excellent functional group tolerance to functionalities that are otherwise prone to reduction, such as sulfones, esters, amides, ketones, nitriles, alkenes, and benzyl ethers. The green nature of the reaction is exemplified by
[EN] AZETIDINE, PYRROLIDINE AND PIPERIDINE DERIVATIVES<br/>[FR] DERIVES DE L'AZETIDINE, DE LA PYRROLIDINE ET DE LA PIPERIDINE
申请人:MERCK SHARP & DOHME LIMITED
公开号:WO1996004274A1
公开(公告)日:1996-02-15
(EN) A class of substituted azetidine, pyrrolidine and piperidine derivatives are selective agonists of 5-HT1-like receptors, being potent agonists of the human 5-HT1D$g(a) receptor subtype whilst possessing at least a 10-fold selective affinity for the 5-HT1D$g(a) receptor subtype relative to the 5-HT1D$g(b) subtype; they are therefore useful in the treatment and/or prevention of clinical conditions, in particular migraine and associated disorders, for which a subtype-selective agonist of 5-HT1D receptors is indicated, whilst eliciting fewer side-effects, notably adverse cardiovascular events, than those associated with non-subtype-selective 5-HT1D receptor agonists.(FR) Classe de dérivés substitués de l'azétidine, de la pyrrolidine et de la pipéridine constituant des agonistes sélectifs des récepteurs du genre 5-HT1 qui sont puissants agonistes du sous-type de récepteur humain 5-HT1D$g(a) tout en possédant une affinité sélective au moins 10 fois plus forte pour le sous-type 5-HT1D$g(a) que le sous-type 5-HT1D$g(b). Ils s'avèrent de ce fait utiles dans le traitement et/ou la prévention d'états cliniques tels que la migraine ou des troubles associés pour lesquels un sous-type sélectif d'agoniste des récepteurs du 5-HT1D est indiqué, tout en provoquant moins d'effets secondaires, tels que certains phénomènes cardio-vasculaires adverses, que ceux qui sont associés à des agonistes non sélectifs du sous-type du récepteur du 5-HT1D.