Imidazole-Catalyzed Monoacylation of Symmetrical Diamines
作者:Sanjeev K. Verma、B. N. Acharya、M. P. Kaushik
DOI:10.1021/ol101604q
日期:2010.10.1
An imidazole-catalyzed protocol for monoacylation of symmetricaldiamines has been developed. The protocol gave selective monoacylation of aliphatic (cyclic and acyclic) primary and secondary diamines. In the reaction, imidazole acts as both catalyst and a leaving group. Different monoacylated piperazines and other diamines were synthesized at room temperature in an ethanol/water solvent system.
their conformational behavior using temperature-dependent 1H NMR spectroscopy. All investigated piperazines occur as conformers at room temperature resulting from the restrictedrotation of the partial amide double bond. In the case of selected mono-N-benzoylated and unsymmetrically N,N′-substituted derivatives, the appearance of the 1H NMR spectrum was further shaped by the limited interconversion of
合成了选定的N-苯甲酰化哌嗪化合物,并使用温度依赖性1 H NMR 光谱研究其构象行为。由于部分酰胺双键的旋转受限,所有研究的哌嗪在室温下均以构象异构体形式出现。在选定的单-N-苯甲酰化和不对称N , N'-取代衍生物的情况下, 1 H NMR谱的外观通过哌嗪椅构象的有限互变进一步形成。因此,确定了两个不同的聚结点T C,并且计算出它们产生的活化能垒 Δ G ‡介于 56 至 80 kJ mol -1之间。在大多数情况下,酰胺位点的T C和 Δ G ‡似乎高于环反转的相应值。通过与哈米特常数的相关性分析了取代基对旋转和反转势垒的影响。所获得的结果在文献数据的背景下进行讨论和解释。与游离仲胺相比,在胺位点连接的额外芳基取代基导致旋转和反转势垒减少。为了支持和证明 NMR 分析的结果,获得了选定哌嗪的单晶并进行了 XRD 分析。为了强调这一结果,对两种潜在的 TGase 2 抑制剂进行了研究,显示出具有相似值的能量势垒。
COMPOUNDS, PHARMACEUTICAL COMPOSITIONS AND USE THEREOF AS INHIBITORS OF RAN GTPASE
申请人:THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING / MCGILL UNIVERSITY
公开号:US20200246365A1
公开(公告)日:2020-08-06
Compounds of general formula IA, IB and IC outlined below, including pharmaceutically acceptable salts, solvates and hydrates thereof. Such compounds and pharmaceutical compositions comprising them may be used in medical conditions involving Ran GTPase.
Anionic phenoxy-amido rare-earth complexes as efficient catalysts for amidation of aldehydes with amines
作者:Chao Wang、Lingling Huang、Min Lu、Bei Zhao、Yaorong Wang、Yong Zhang、Qi Shen、Yingming Yao
DOI:10.1039/c5ra20285j
日期:——
n-BuLi in tetrahydrofuran (THF) in situ, gave the anionic phenoxy-amido rare earth amido complexes [NO]12Ln[N(SiMe3)2][Li(THF)]2 [Ln = Y (1), Yb (2), Sm (3), Nd (4)] in high isolated yields. Similar reactions of Ln[N(SiMe3)2]3(μ-Cl)Li(THF)3 with [HNO]2Li(THF)}2, and [HNO]3Li(THF)}2 in THF gave the anionic rare-earth amides [NO]22Ln[N(SiMe3)2][Li(THF)]2 [Ln = Sm (5), Nd (6)] and [NO]32Ln[N(SiMe3)2][Li(THF)]2