微波辅助合成2-芳基-2-恶唑啉,5,6-二氢-4 H -1,3-恶嗪和4,5,6,7-四氢-1,3-恶氮杂s
摘要:
提出了通过微波辅助多磷酸(PPA)酯促进的ω-氨基醇的环化反应合成5至7元环亚氨基醚的第一个通用程序。使用聚磷酸乙酯/ CHCl 3有效地制备了2-芳基-2-恶唑啉和5,6-二氢-4 H -1,3-恶嗪。在无溶剂条件下,多磷酸三甲基甲硅烷基酯可合成迄今未报道的4,5,6,7-四氢-1,3-氧杂氮杂pine。该方法具有良好的收率和优异的收率,并且反应时间短。在手性底物中研究了PPA酯的反应机理和作用。
Addition Reaction of Carboxylic Anhydrides to the Carbon-Nitrogen Double Bond of Unsubstituted Cyclic Imidates
作者:Shiro Kobayashi、Michihisa Isobe、Takeo Saegusa
DOI:10.1246/bcsj.55.1921
日期:1982.6
cyclic (SAn and GAn) carboxylic anhydrides were added at room temperature to the C=N bond of unsubstituted cyclic imidates of 2-oxazoline (OZO) and 5,6-dihydro-4H-1,3-oxazine (OZI) to give addition products quantitatively. In contrast to these findings, the reactions of acetyl halides with OZO and OZI yielded ringopened products and the reactions of carboxylic anhydrides with 2-benzyl-2-oxazoline (BzOZO)
Hexaalkylguanidinium salts as ionic liquids – applications in titanium and aluminium alcoholate assisted synthesis
作者:Maria Arkhipova、Svetlana Eichel、Gerhard Maas
DOI:10.1039/c4ra09567g
日期:——
hexaalkylguanidinium-based roomtemperature ionic liquids was screened. The solvent/solute combinations which displayed the highest alcoholate solubility and stability were applied as Lewis-acidic catalytic media for several dehydrating cyclocondensations: lactamisation of ω-aminocarboxylic acids, directamidation of carboxylicacids, synthesis of oxazolines from carboxylicacids and 2-aminoethanol, lactonisation
<i>N</i>-Nitrosotolazoline: Decomposition Studies of a Typical <i>N</i>-Nitrosoimidazoline
作者:Richard N. Loeppky、Jianzheng Shi
DOI:10.1021/tx700318k
日期:2008.2.1
protonation of the imino nitrogen atom followed by slow general base-catalyzed addition of H2O to the 2-carbon of the imidazoline ring to give a tetrahedral intermediate, which is also a alpha-hydroxynitrosamine. Rapid decomposition of this species gives rise to the diazonium from which the products are derived by nucleophilic attack, elimination, and rearrangement. The proposed mechanism is supported by
Ultrasound-Accelerated, Concise, and Highly Efficient Synthesis of 2-Oxazoline Derivatives Using Heterogenous Calcium Ferrite Nanoparticles and Their DFT Studies
作者:Anjaneyulu Bendi、Shalu Atri、G. B. Dharma Rao、Mohd Jamshaiya Raza、Nutan Sharma
DOI:10.1155/2021/7375058
日期:2021.10.21
rapid and operationally simple approach for synthesising biologically relevant 2-oxazoline derivatives has been developed through highly efficient ultrasound-promoted coupling reactions of thioamides and amino alcohols using calcium ferritenanoparticles as heterogeneous catalysts. The major advantage of using ultrasound irradiation lies in the drastic reduction of reaction time as compared with conventional
使用铁酸钙纳米颗粒作为多相催化剂,通过硫代酰胺和氨基醇的高效超声促进偶联反应,开发了一种快速且操作简单的合成生物相关 2-恶唑啉衍生物的方法。与传统搅拌相比,使用超声波辐射的主要优点在于反应时间的显着减少。此外,已在 DFT/B3LYP/6-311 + G (d, p) 理论水平上对合成的 2-恶唑啉衍生物进行了量子化学研究,以预测优化的几何形状。分子特性,例如键长、键级、美利肯电荷、前沿分子轨道、全局反应性描述符、分子静电势图、
A facile synthesis of 2-oxazolines using a PPh3–DDQ system
作者:Quancai Xu、Zhengning Li
DOI:10.1016/j.tetlet.2009.09.127
日期:2009.12
A facile and efficient synthesis of 2-oxazolines from N-(2-hydroxyethyl)amides using a triphenylphosphine–2,3-dichloro-5,6-dicyanobenzoquinone (PPh3–DQQ) system is described. The reaction proceeds under neutral and mild conditions, and excellent yields are obtained.