Reticular Synthesis of tbo Topology Covalent Organic Frameworks
作者:Xing Kang、Xing Han、Chen Yuan、Cheng Cheng、Yan Liu、Yong Cui
DOI:10.1021/jacs.0c06605
日期:2020.9.23
The metal-organicframework (MOF) HKUST-1 with a tbo topology serves as an archetypal tunable and isoreticular framework platform for targeting desired applications, but the design and synthesis of tbo-covalent organic frameworks (COFs) remains a formidable challenge. Here we demonstrate the successful use of reticular chemistry as an appropriate strategy for the design and deliberate construction
Copper-Mediated Difluoromethylation of (Hetero)aryl Iodides and β-Styryl Halides with Tributyl(difluoromethyl)stannane
作者:G. K. Surya Prakash、Somesh K. Ganesh、John-Paul Jones、Aditya Kulkarni、Kamil Masood、Joseph K. Swabeck、George A. Olah
DOI:10.1002/anie.201205850
日期:2012.11.26
Owing to their unique properties, molecules containing the difluoromethyl group (CF2H) are of great interest. Tributyl(difluoromethyl)stannane has now been used for the selective and efficient direct ipso difluoromethylation of aryl iodides, heterocyclic iodides, and β‐styryl halides (see scheme). The straightforward preparation of the difluoromethylating reagent makes this approach particularly valuable
Selective Late‐Stage Hydrodefluorination of Trifluoromethylarenes: A Facile Access to Difluoromethylarenes
作者:Socrates B. Munoz、Chuanfa Ni、Zhe Zhang、Fang Wang、Nan Shao、Thomas Mathew、George A. Olah、G. K. Surya Prakash
DOI:10.1002/ejoc.201700396
日期:2017.4.26
A selective reductive monodefluorination reaction of trifluoromethyl arenes was developed. Mediated by magnesium metal, various difluoromethylated aromatics were accessed at room temperature in the presence of acetic acid. This protocol shows tolerance to a wide range of functional groups and it was applicable in late-stage hydrodefluorination of complex pharmaceutical compounds, affording the corresponding
to a nickel(0) complex is described. A nickel(0) complex that bears two N-heterocyclic carbene (NHC) ligands of low steric demand is able to cleave C(sp3)-F bonds of trifluoromethylarenes to afford the corresponding trans-difluorobenzyl nickel(II) fluoride complexes. Isolation and characterization studies suggested that the cleavage of the C(sp3)-F bond proceeds via an η2-arene nickel(0) complex. Taking
Access to Difluoromethylated Arenes by Pd-Catalyzed Reaction of Arylboronic Acids with Bromodifluoroacetate
作者:Zhang Feng、Qiao-Qiao Min、Xingang Zhang
DOI:10.1021/acs.orglett.5b03206
日期:2016.1.4
of aryl boronic acids with bromodifluoroacetate is described. The reaction proceeds under mild reaction conditions with hydroquinone and Fe(acac)3 as additives. Preliminary mechanistic studies reveal that a difluorocarbene pathway is involved in the reaction, which is unusual compared to the most traditional approaches. This reaction has advantages of high efficiency and excellent functional group compatibility