Stable and reusable nanoscale Fe<sub>2</sub>O<sub>3</sub>-catalyzed aerobic oxidation process for the selective synthesis of nitriles and primary amides
作者:Kathiravan Murugesan、Thirusangumurugan Senthamarai、Manzar Sohail、Muhammad Sharif、Narayana V. Kalevaru、Rajenahally V. Jagadeesh
DOI:10.1039/c7gc02627g
日期:——
nitriles and amides from easily available starting materials using cost-effective catalysts and green reagents is highly desired. In this regard, herein we report the nanoscale iron oxide-catalyzed environmentally benign synthesis of nitriles and primary amides from aldehydes and aqueous ammonia in the presence of 1 bar O2 or air. Under mild reaction conditions, this iron-catalyzed aerobic oxidation process
在腈纶或酰胺基团形式的功能化分子中可持续引入氮基是至关重要的,因为在许多生命科学分子,天然产物和材料中都发现了含氮基序。因此,非常需要使用具有成本效益的催化剂和绿色试剂从容易获得的起始原料合成腈和酰胺的方法。就这一点而言,本文报道了在1 bar O 2的存在下,由醛和氨水进行的纳米级氧化铁催化的腈和伯酰胺的环境友好合成。或空气。在温和的反应条件下,该铁催化的需氧氧化过程继续进行,以合成功能化且结构多样的芳族,脂族和杂环腈。另外,应用该铁基方案,还已经在水介质中制备了伯酰胺。
A Ritter-Type Route to <i>N</i>-Benzylamides by Multicomponent Reaction Based on <i>p</i>-(Trifluoromethyl)-<i>p</i>-quinols
作者:Chengjie Feng、Yifei Li、Xinyao Sheng、Ling Pan、Qun Liu
DOI:10.1021/acs.orglett.8b02762
日期:2018.10.19
A novel multicomponent reaction of p-(trifluoromethyl)- p-quinolsilyl ethers, ketones, and nitriles was developed for the efficient synthesis of p-trifluoromethylated N-benzylamides. The key step of the reaction involves the formation of an unstable condensation precursor in situ generated form the condensation of p-(trifluoromethyl)- p-quinolsilyl ethers with ketones. This work provides a significant
Dimesitylcarbene (2a) was shown to decay by undergoing dimerization and to have a half-life of 160 ms, some 5 orders of magnitude longer-lived than diphenylcarbene. Didurylcarbene (2b) was twice as long-lived as 2a, while decamethyldiphenylcarbene (2c) decayed mainly unimolecularly by abstracting H from the o-methyl group and became shorter-lived than 2b. 2,4,6-Tri(tert-butyl)diphenylcarbene (14) decayed
Dimesitylcarbene (2a) 显示通过二聚作用而衰变,半衰期为 160 ms,比二苯基卡宾长约 5 个数量级。二十二烷基卡宾 (2b) 的寿命是 2a 的两倍,而十甲基二苯基卡宾 (2c) 主要通过从邻甲基中提取 H 以单分子方式衰变,并且比 2b 寿命更短。2,4,6-三(叔丁基)二苯基卡宾 (14) 几乎完全通过从邻叔丁基中提取 H 进行单分子衰变,并显示出 125 μs 的寿命。2c 和 14 的 H 和 D 提取的阿伦尼乌斯图提供了与经典原子转移反应一致的数据,尽管两个系统之间的动力学参数非常不同。
Catalytic Reduction of Nitriles by Polymethylhydrosiloxane Using a Phenalenyl-Based Iron(III) Complex
作者:Shyamal Das、Hari Sankar Das、Bhagat Singh、Rahul Koottanil Haridasan、Arpan Das、Swadhin K. Mandal
DOI:10.1021/acs.inorgchem.9b01377
日期:2019.9.3
The reduction of nitriles to primary amines using an inexpensive silane such as polymethylhydrosiloxane (PMHS) is an industrially important reaction. Herein we report the synthesis of an earth-abundant Fe(III) complex bearing a phenalenyl-based ligand that was characterized by mass spectroscopy, elemental analysis, cyclicvoltammetry, and single-crystal X-ray diffraction. The complex showed excellent