An efficient synthesis of 3-(N-piperidinemethyl)-2,2,5,5-tetramethyl-1-oxy-3-pyrroline, a promising radioprotector for cancer radiotherapy
摘要:
Nitroxides can ameliorate the toxic effects of radiation during cancer therapy. Nitroxides are paramagnetic and can be used in magnetic resonance imaging (MRI) and electron paramagnetic resonance imaging (EPRI) to monitor in vivo oxidative stress status. Compound 5 (3-(N-piperidinemethyl)-2,2,5,5-tetramethyl-1-oxy-3-pyrroline) was found to be the most effective nitroxide radioprotector. An efficient synthesis for this promising radioprotector was developed. Published by Elsevier Ltd.
[EN] METAL AMIDES OF CYCLIC AMINES<br/>[FR] AMIDES MÉTALLIQUES D'AMINES CYCLIQUES
申请人:HARVARD COLLEGE
公开号:WO2015013630A1
公开(公告)日:2015-01-29
Compounds, and oligomers of the compounds, are synthesized with cyclic amine ligands attached to a metal atom. These compounds are useful for the synthesis of materials containing metals. Examples include pure metals, metal alloys, metal oxides, metal nitrides, metal phosphides, metal sulfides, metal selenides, metal tellurides, metal borides, metal carbides, metal silicides and metal germanides. Techniques for materials synthesis include vapor deposition (chemical vapor deposition and atomic layer deposition), liquid solution methods (sol-gel and precipitation) and solid-state pyrolysis. Suitable applications include electrical interconnects in microelectronics and magnetoresistant layers in magnetic information storage devices. The films have very uniform thickness and high step coverage in narrow holes.
The disclosure shows a liquid crystal composition that contains a compound having an effect of preventing photolysis of the liquid crystal composition and having high solubility in the liquid crystal composition, and that satisfies at least one of characteristics such as high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large positive or negative dielectric anisotropy, large specific resistance, high stability to ultraviolet light or heat, and a suitable elastic constant, etc. and so on.
The disclosure shows a liquid crystal composition that contains a compound having the following azolidine ring (Q-1) or azepane ring (Q-2), a liquid crystal display device and so on.
with DPROXYL-3-ylmethyl methanesulfonate (5). Fluorescence intensities (around 520nm) after reduction of the radical increased to 1.43-, 1.38-, and 1.61-folds for 2a, 2b and 3b respectively; 3a alone exhibited a decrease in intensity on reduction. Since 4 was readily solvolyzed in PBS or even methanol to afford fluorescein and 4-carboxy-TEMPO, its fluorescence change could not be measured. Hybrid compound
새로운 18F-표지된 친디엔체와 테트라진 화합물과의 IeDDA 반응을 이용한 18F-표지 방법
申请人:FutureChem Co., Ltd. (주)퓨쳐켐(120040453668) Corp. No ▼ 124611-0260311BRN ▼121-81-46715
公开号:KR20200097846A
公开(公告)日:2020-08-20
테트라진 화합물과 친디엔체 간의 IeDDA (Inverse electron Demand Diels-Alder) 반응을 이용한 F-18 방사성동위원소의 표지기술에 관한 것으로, 본 발명의 케톤 화합물은 이차 아민과 함께 수용액 상에서 쉽게 엔아민을 형성하며 테트라진 화합물과 매우 빨리 컨쥬게이션 반응을 일으킨다. 특히 수용액에서 물의 양이 많을수록 반응이 잘 진행되는 특징이 있어 펩타이드나 항체 등의 생체화합물에 적합한 장점이 있다. 또한, 여러 입체 이성체를 형성시키는 기존 반응과 달리 주생성물 이외에 소량의 한가지 구조이성질체만 생성되는 특징이 있으며 고성능 액체크로마토그래피법 등을 이용하여 정제할 수 있는 장점이 있다. 나아가, 기존의 낮은 수율의 F-표지 테트라진 또는 F-표지 TCO 합성에 비해 본 발명의 화학식 1인 F-표지된 케톤 화합물은 그 전구체로부터 높은 F-표지 수율로 합성될 수 있다.
这段文本描述了使用IeDDA(Inverse electron Demand Diels-Alder)反应来制备F-18放射性同位素标记技术中的酮化合物。该酮化合物与二次胺在溶液中很容易形成烯胺,并与四氢喹啉类化合物迅速发生共轭反应。特别是在溶液中水的量越多,反应进行得越顺利,适用于生物化合物如肽和抗体等。此外,与形成多种立体异构体的传统反应不同,该反应除了主生成物外只生成少量一种结构异构体,可以利用高性能液相色谱法等方法进行纯化。此外,与现有低产率的F-标记四氢喹啉或F-标记TCO合成相比,本发明化合物F-标记的酮化合物可以以更高的产率从其前体合成。
Synthesis, Physical Properties, and Cytotoxicity of Nitroxyl-Aziridine Hybrid
synthesized by aziridine formation reaction of nitroxyl‐introduced aldehyde and guanidinium ylide in good diastereoselectivity. The relative configuration at aziridine C(2)C(3) bond of the major diastereoisomer was determined to be cis by X‐ray crystallographic analysis. Application of chiral guanidinium ylide resulted in the formation of the corresponding optically active aziridine in 84% ee. Reversible