An Efficient Transformation from Benzyl or Allyl Halides to Aryl and Alkenyl Nitriles
摘要:
A novel approach to aryl or alkenyl nitriles from benzyl and allyl halides has been developed. A tandem TBAB-catalyzed substitution and the subsequent novel oxidative rearrangement are involved in this transformation. To the best of our knowledge, this is the first transformation from allyl halides to alkenyl nitriles. The broad reaction scope and the mild conditions may make these methods of use in organic synthesis.
A combination of trimethylsilyl chloride and hydrous natural montmorillonite clay: an efficient solid acid catalyst for the azidation of benzylic and allylic alcohols with trimethylsilyl azide
Synthesis of Polysubstituted Imidazoles and Pyridines<i>via</i>Samarium(III) Triflate-Catalyzed [2+2+1] and [4+2] Annulations of Unactivated Aromatic Alkenes with Azides
作者:Yingchun Wang、Jiuling Li、Yan He、Yuyang Xie、Hengshan Wang、Yingming Pan
DOI:10.1002/adsc.201500584
日期:2015.10.12
Samarium(III) triflate-catalyzed [2+2+1] and [4+2] annulations have been identified for the preparation of fully substituted imidazoles and 2,3,5-trisubstituted pyridines from the readily available unactivatedaromaticalkenes and azidomethyl aromatics. These reactions proceeded smoothly with one- or two-nitrogen synthons to afford a range of two types of skeletally distinct N-heterocycles in good
A Highly Efficient Single-Chain Metal–Organic Nanoparticle Catalyst for Alkyne–Azide “Click” Reactions in Water and in Cells
作者:Yugang Bai、Xinxin Feng、Hang Xing、Yanhua Xu、Boo Kyung Kim、Noman Baig、Tianhui Zhou、Andrew A. Gewirth、Yi Lu、Eric Oldfield、Steven C. Zimmerman
DOI:10.1021/jacs.6b04477
日期:2016.9.7
metal-organic nanoparticles (MONPs) are readily synthesized via Cu(II)-mediated intramolecular cross-linking of aspartate-containing polyolefins in water. In situ reduction with sodium ascorbate yields Cu(I)-containing MONPs that serve as highly efficient supramolecular catalysts for alkyne-azide "click chemistry" reactions, yielding the desired 1,4-adducts at low parts per million catalyst levels. The
A facile synthesis of 2,5-disubstituted oxazoles via a copper-catalyzed cascade reaction of alkenes with azides
作者:Jiu-ling Li、Ying-chun Wang、Wei-ze Li、Heng-shan Wang、Dong-liang Mo、Ying-ming Pan
DOI:10.1039/c5cc06487b
日期:——
A novel and efficient approach to 2,5-disubstitutedoxazoles is developed via a 1,3-dipolar cycloaddition/ring cleavage/1,2-H migration/denitrogenation/copper-catalyzed aerobic oxidative dehydrogenative cyclization cascade. The desired products can be obtained from readily available...
A series of novel substituted 1,2,3-triazolyldihydroquinolines 6a-o was designed and synthesized from 2-acetylthiophene in five-step reaction sequence involving modified Boltzmann-Rahtz reaction of β-Enaminone; Vilsmeier-Haack chloroformylation using DMF/POCl3; Ohira-Bestmann homologation of aldehyde to alkyne as key steps. The reaction of alkyne 4 with various aryl azides in the presence of copper