HeterocyclicN-Acetoxyarylamines, Models for the Putative Ultimate Carcinogens of Aromatic Amines: 2-Acetoxyamino-5-phenylpyridine and 2-Acetoxyaminopyridine
摘要:
The structures of O-acetyl-N-(5-phenyl-2-pyridyl)-hydroxylamine, C13H12N2O2, (I), and O-acetyl-N-(2-pyridyl)hydroxylamine, C7H8N2O2, (II), have been determined in order to confirm earlier structure assignments based on spectroscopic information. Compound (I) is the probable mutagenic metabolite of the phenylalanine pyrolysis product 2-amino-5-phenyl-pyridine, The crystal structures of (I) and (II) are the first reported for heterocyclic N-acetoxyarylamines, the corresponding homocyclic arylamine derivatives being extremely unstable. In the solid state, both (I) and (II) exist as hydrogen-bended dimers, with the arylamine N atom acting as donor and the pyridine N atom of a neighboring inversion-related molecule as acceptor; the distance between donor and acceptor N atoms is 3.007(2) in (I) and 2.956(2) Angstrom in (II). This orientation of the N-H bond results in the rotation of the acetoxy group out of the plane of the pyridine ring by 22.5(2) in (I) and 27.4(2)degrees in (II).
[EN] COMPLEXES FOR NUCLEOPHILIC, RADICAL, AND ELECTROPHILIC POLYFLUOROALKYLATION<br/>[FR] COMPLEXES POUR POLYFLUOROALKYLATION NUCLÉOPHILE, RADICALAIRE ET ÉLECTROPHILE
申请人:UNIV MICHIGAN REGENTS
公开号:WO2017223406A1
公开(公告)日:2017-12-28
Disclosed herein are borazine complexes and use of the same in perfluoroalkylation reactions.
本文披露了硼氮烷配合物及其在全氟烷基化反应中的应用。
Borazine‐CF
<sub>3</sub>
<sup>−</sup>
Adducts for Rapid, Room Temperature, and Broad Scope Trifluoromethylation
作者:Jacob B. Geri、Michael M. Wade Wolfe、Nathaniel K. Szymczak
DOI:10.1002/anie.201711316
日期:2018.1.26
A fluoroform‐derived borazine CF3− transfer reagent is used to effect rapid nucleophilic reactions in the absence of additives, within minutes at 25 °C. Inorganic electrophiles spanning seven groups of the periodic table can be trifluoromethylated in high yield, including transition metals used for catalytic trifluoromethylation. Organic electrophiles included (hetero)arenes, enabling C−H and C−X
Triarylbismuthanes as Threefold Aryl-Transfer Reagents in Regioselective Cross-Coupling Reactions with Bromopyridines and Quinolines
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1002/ejoc.201402455
日期:2014.8
Cross-coupling studies using bromopyridines and bromoquinolines with triarylbismuths as threefold coupling reagents in substoichiometric amounts under Pd-catalysed conditions are disclosed. The reactivity was high with both mono- and dibromopyridyl substrates, and mono- and bis-couplings were carried out regioselectively. A library of monoaryl and diaryl pyridines was formed in high yields. A one-pot
Microwave assisted batch and continuous flow Suzuki–Miyaura reactions in GVL using a Pd/PiNe biowaste-derived heterogeneous catalyst
作者:Federica Valentini、Benedetta Di Erasmo、Marta Ciani、Shaomin Chen、Yanlong Gu、Luigi Vaccaro
DOI:10.1039/d4gc00497c
日期:2024.4.22
of the Suzuki–Miyaura (SM) cross-coupling process with a circular economy approach. For the first time, in this study, we have combined the use of our biowaste-derived heterogeneous catalyst Pd/PiNe with the biomass-derived reaction medium γ-valerolactone (GVL) proving that an optimised protocol can be obtained for the SM process with a significant substrate scope. The microwaveirradiation technology
为了开发替代性和低影响的合成途径,我们在此报告了不同工具的开发和同时使用,以通过循环经济方法提高铃木-宫浦(SM)交叉耦合过程的整体可持续性。在这项研究中,我们首次将生物废物衍生的多相催化剂 Pd/PiNe 与生物质衍生的反应介质 γ-戊内酯 (GVL) 结合使用,证明可以为 SM 工艺获得优化的方案一个重要的底物范围。微波辐射技术大大提高了能量效率,可以合成不同的联苯并减少反应时间。此外,SM 反应的良好效率和选择性导致了后处理程序的进一步优化,最大限度地减少了废物的产生和与该过程相关的E因子值 (3.2–9.4)。优化的条件对游离羧酸基团具有良好的耐受性,实现了非甾体抗炎镇痛药芬布芬的一步经济、定量制备。最后,与连续流动方案的优化协同进行了MW辅助工艺的放大,并实现了芬布芬的废物最小化合成。
Bumagin; Bykov, Russian Journal of General Chemistry, 1996, vol. 66, # 12, p. 1925 - 1938