Simple and Efficient Method for Acetylation of Alcohols, Phenols, Amines, and Thiols Using Anhydrous NiCl<sub>2</sub> Under Solvent-Free Conditions
作者:Gangadhar Meshram、Vishvanath D. Patil
DOI:10.1080/00397910902906529
日期:2009.11.18
Abstract Solvent-free acetylation of alcohols, phenols, amines, and thiols with acetic anhydride (Ac2O) in the presence of 0.1 mol% (13 mg) anhydrous NiCl2, an inexpensive and easily available catalyst, is described. Excellent yields, short reaction time, and mild reaction conditions are important features of this method.
Aminopyrazine compounds as modulators of an adenosine receptor are provided. The compounds may find use as therapeutic agents for the treatment of diseases mediated through a G-protein-coupled receptor signaling pathway and may find particular use in oncology.
Dual-Channel Enzymatic Inhibition Measurement (DEIM) Coupling Isotope Substrate via Matrix-Assisted Laser Desorption/Ionization Time of Flight Mass Spectrometry
作者:Min Tao、Li Zhang、Yinlong Guo
DOI:10.1007/s13361-018-2054-3
日期:2018.12.1
A novel dual-channel enzymatic inhibition measurement (DEIM) method was developed to improve the repeatability with light/heavy isotope substrates, producing reliable relative standard deviations (< 3%) by employing acetylcholinesterase (AChE) as the model enzyme. The matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) was adapted for enzyme-inhibited method due to its good salt-tolerance and high throughput; meanwhile, dual-channel enzymatic reactions were performed to improve the repeatability of each well. The acetylcholinesterase inhibition measurement was conducted by mixing the quenched enzyme reaction solution of blank group (with heavy isotope as substrate) and experimental group (with light isotope as substrate), of which the inhibition rate might be affected by isotope effects. Hence, inverse study and Km measurement were implemented to validate the method. The inverse study shows similar inhibition rate (68.9 and 70.3%) and the Km of isotope substrates are analogous (0.139 and 0.135 mM), which demonstrated that the novel method is feasible to AChE inhibition measurement. Finally, the method was applied to herb extracts, half of which exhibit inhibition to AChE. The precise dual-channel enzymatic inhibition measurement (DEIM) method could be regarded as a promising approach to potential enzyme inhibitor screening.
以乙酰胆碱酯酶(AChE)为模型酶,建立了一种新型的双通道酶抑制测量(DEIM)方法,以提高轻/重同位素底物的重复性,产生可靠的相对标准偏差(< 3%)。由于基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)具有良好的耐盐性和高通量,因此被用于酶抑制方法;同时,双通道酶反应提高了每孔的重复性。乙酰胆碱酯酶抑制率的测定是将空白组(以重同位素为底物)和实验组(以轻同位素为底物)的淬火酶反应液混合后进行的,其中抑制率可能会受到同位素效应的影响。因此,我们采用了反演研究和 Km 测量来验证该方法。反向研究表明,抑制率相似(68.9%和 70.3%),同位素底物的 Km 值相似(0.139 和 0.135 mM),这表明新方法在 AChE 抑制测定中是可行的。最后,该方法被应用于草药提取物,其中一半对 AChE 有抑制作用。精确的双通道酶抑制测量(DEIM)方法可被视为筛选潜在酶抑制剂的一种有前途的方法。
[EN] TRICYCLIC COMPOUNDS TO DEGRADE NEOSUBSTRATES FOR MEDICAL THERAPY<br/>[FR] COMPOSÉS TRICYCLIQUES POUR DÉGRADER DES NÉO-SUBSTRATS POUR UNE THÉRAPIE MÉDICALE
申请人:C4 THERAPEUTICS INC
公开号:WO2022081927A1
公开(公告)日:2022-04-21
The invention provides tricyclic compounds that degrade neosubstrates for use in the treatment of disorders described herein, including, for example, abnormal cellular proliferation, neurodegenerative diseases, and autoimmune diseases.
[EN] HETEROARYLPIPERIDINES, PYRROLIDINES AND PIPERAZINES AND THEIR USE AS ANTIPSYCHOTICS AND ANALGETICS
申请人:HOECHST-ROUSSEL PHARMACEUTICALS, INC.
公开号:WO1993009102A1
公开(公告)日:1993-05-13
(EN) Heteroarylpiperidines, pyrrolidines, and piperazines are useful as antipsychotic and analgesic agents. The compounds are especially useful for treating psychoses by administering to a mammal a psychoses-treating effective amount of one of the compounds. The compounds are also useful as analgesics by administering a pain-relieving effective amount of one of the compounds to a mammal.(FR) Des hétéroarylpiperidines, pyrrolidines et piperazines sont utiles comme agents neuroleptiques et analgésiques. Les composés sont particulièrement utiles dans le traitement de psychoses par administration à un mammifère d'une dose efficace de traitement de psychose d'un des composés. Les composés sont également utiles en tant qu'analgésiques par administration à un mammifère d'une dose efficace calmant la douleur d'un des composés.