对个性化医疗和新疗法的日益重视需要开发用于评估体内生物化学的非侵入性策略。体内酶活性和基因表达的检测对于疾病和基因治疗的表征具有潜在的重要意义。磁共振成像 (MRI) 是一种特别有前途的工具,因为它是非侵入性的,没有相关的放射性,但可以穿透深层组织。我们现在展示了一类新的双1 H/ 19 F 核磁共振 (NMR) lacZ基因报告分子专门揭示在小鼠体内生长的人类肿瘤异种移植物中的酶活性。我们报告了六种新型分子的设计、合成和表征,以及对小鼠体内最有效记者的评估。底物显示单个19 F NMR 信号,暴露于 β-半乳糖苷酶会诱导大的19 F NMR 化学位移响应。在三价铁离子的存在下,释放的苷元产生强烈的质子 MRI T 2对比。双模态方法允许检测底物和产品成像,提高酶检测的信心。
Radical “On Water” Addition to the C═N Bond of Hydrazones: A Synthesis of Isoindolinone Derivatives
作者:Tae Kyu Nam、Doo Ok Jang
DOI:10.1021/acs.joc.7b03193
日期:2018.7.20
A radical “on water” addition to the C═Nbond of hydrazones has been described. Hydrazone, diphenylsilane, alkyl iodide, and triethylborane afforded the corresponding addition products “on water” in good yields. A significant solvent effect was observed from the water. The developed protocol can be applied to the synthesis of 3-substituted isoindolinone derivatives. Moreover, the process offers environmentally
A facile catalytic one-pot synthesis of N-acylhydrazones via acceptorless dehydrogenativecoupling of readily available alcohols and benzohydrazides (R2CONHNH2) using arene ruthenium (II) complexes has been described. The coupling of alcohols with various benzohydrazides using ruthenium catalysts provide a wide range of N-acylhydrazones in good to excellent yields (63–93%; 32 examples). The present
已经描述了使用芳烃钌 (II) 配合物通过容易获得的醇和苯并酰肼 (R 2 CONHNH 2 ) 的无受体脱氢偶联,轻松催化一锅法合成N-酰基腙。使用钌催化剂将醇与各种苯并酰肼偶联提供了广泛的N-酰基腙具有良好至极好的收率(63–93%;32 个例子)。本协议提供了高选择性的腙,没有任何烷基化产物,并耐受一系列官能团。对照实验表明,该机制通过醇的无受体脱氢进行,氢和水是唯一的副产物。克级合成说明了本策略的有用性。
Cu(II) Catalyzed Imine C–H Functionalization Leading to Synthesis of 2,5-Substituted 1,3,4-Oxadiazoles
作者:Srimanta Guin、Tuhin Ghosh、Saroj Kumar Rout、Arghya Banerjee、Bhisma K. Patel
DOI:10.1021/ol202409r
日期:2011.11.18
symmetrical and unsymmetrical 2,5-disubstituted [1,3,4]-oxadiazoles has been accomplished through an imine C–H functionalization of N-arylidenearoylhydrazide using a catalytic quantity of Cu(OTf)2. This is the first example of amidic oxygen functioning as a nucleophile in a Cu-catalyzed oxidative coupling of an imine C–H bond. These reactions can be performed in air atmosphere and moisture making it exceptionally
Dual <sup>19</sup>F/<sup>1</sup>H MR Gene Reporter Molecules for <i>in Vivo</i> Detection of β-Galactosidase
作者:Jian-Xin Yu、Vikram D. Kodibagkar、Rami R. Hallac、Li Liu、Ralph P. Mason
DOI:10.1021/bc200647q
日期:2012.3.21
demonstrate a novel class of dual 1H/19F nuclear magnetic resonance (NMR) lacZ gene reportermolecule to specifically reveal enzyme activity in human tumor xenografts growing in mice. We report the design, synthesis, and characterization of six novelmolecules and evaluation of the most effective reporter in mice in vivo. Substrates show a single 19F NMR signal and exposure to β-galactosidase induces a
对个性化医疗和新疗法的日益重视需要开发用于评估体内生物化学的非侵入性策略。体内酶活性和基因表达的检测对于疾病和基因治疗的表征具有潜在的重要意义。磁共振成像 (MRI) 是一种特别有前途的工具,因为它是非侵入性的,没有相关的放射性,但可以穿透深层组织。我们现在展示了一类新的双1 H/ 19 F 核磁共振 (NMR) lacZ基因报告分子专门揭示在小鼠体内生长的人类肿瘤异种移植物中的酶活性。我们报告了六种新型分子的设计、合成和表征,以及对小鼠体内最有效记者的评估。底物显示单个19 F NMR 信号,暴露于 β-半乳糖苷酶会诱导大的19 F NMR 化学位移响应。在三价铁离子的存在下,释放的苷元产生强烈的质子 MRI T 2对比。双模态方法允许检测底物和产品成像,提高酶检测的信心。