我们已经进行了一系列的化学计量研究,以确定可行的步骤为一个假设的催化循环的芳族溴化物与TMSCF 3的钯介导的羰基化偶联。我们的工作表明,带有Xantphos或t Bu 3 P作为膦配体的苯甲酰基Pd(II)配合物是由相应的Pd II(Ph)Br配合物从13暴露于化学计量的13 CO中生成的二氧化碳不能进行金属转移和还原消除为三氟苯乙酮。相反,在碱和另外的CO的存在下,这些有机金属配合物容易进行还原性消除为酰氟。试图确定酸性氟化物是否可以代表苯乙酮生产的中间体的尝试是没有意义的。尽管转化效率仍然很低,但只有在硼酸酯存在下,我们才能观察到所需产物的某些形成。最后,我们研究了四种膦连接的Pd II(Ph)CF 3配合物(Xantphos,D t BPF,t Bu 3 P和三苯膦)与一氧化碳的反应性。除了t Bu 3 P连接的配合物,所有其他金属配合物导致三氟乙酰苯的容易形成。我们在三苯基膦的情
Oxygen-atom insertion of NHC–copper complex: The source of oxygen from N,N-dimethylformamide
摘要:
An unprecedented protocol for oxygen-atom insertion reaction of NHC-copper complexes has been developed by employing N,N-dimethylformamide as the oxygen source, which allows the preparation of imidazolinones from carbene complexes and decodes one of the mysterious transformations of NHC-metal complexes as well. (C) 2013 Elsevier B.V. All rights reserved.
Application of Vinamidinium Salt Chemistry for a Palladium Free Synthesis of Anti-Malarial MMV048: A “Bottom-Up” Approach
作者:Dinesh J. Paymode、Le Chang、Dan Chen、Binglin Wang、Komirishetty Kashinath、Vijayagopal Gopalsamuthiram、D. Tyler McQuade、N. Vasudevan、Saeed Ahmad、David R. Snead
DOI:10.1021/acs.orglett.1c01725
日期:2021.7.16
MMV390048 (1) is a clinical compound under investigation for antimalarial activity. A new syntheticroute was developed which couples two aromatic fragments while forming the central pyridine ring over two steps. This sequence takes advantage of raw materials used in the existing etoricoxib supply chain and eliminates the need for palladium catalysts, which were projected to be major cost-drivers.
The present invention relates to compounds that are Nrf2 activators. The compounds have the structural formula I defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of diseases or disorders associated with Nrf2 activation.
Recyclable Trifluoromethylation Reagents from Fluoroform
作者:Jacob B. Geri、Nathaniel K. Szymczak
DOI:10.1021/jacs.7b05408
日期:2017.7.26
We present a strategy to rationally prepare CF3- transfer reagents at ambient temperature from HCF3. We demonstrate that a highly reactive CF3- adduct can be synthesized from alkalimetalhydride, HCF3, and borazine Lewis acids in quantitative yield at room temperature. These nucleophilic reagents transfer CF3- to substrates without additional chemical activation, and after CF3 transfer, the free borazine