作者:Haiwen Xiao、Zhonglin Liu、Haigen Shen、Benxiang Zhang、Lin Zhu、Chaozhong Li
DOI:10.1016/j.chempr.2019.02.006
日期:2019.4
Direct trifluoromethylation of C(sp3)–H bonds, especially in late stages, remains a formidable challenge. Herein, we describe the copper-catalyzed benzylicC(sp3)–H trifluoromethylation. With Cu(I) or Cu(II) as the catalyst, (bpy)Zn(CF3)2 (bpy = 2,2′-bipyridine) as the CF3 source, and NFSI (or Selectfluor) as the oxidant, site-selective benzylicC(sp3)–H trifluoromethylation is successfully implemented
Direct preparation of benzylic manganese reagents from benzyl halides, sulfonates, and phosphates and their reactions: applications in organic synthesis
作者:YoungSung Suh、Jun-sik Lee、Seoung-Hoi Kim、Reuben D Rieke
DOI:10.1016/s0022-328x(03)00500-x
日期:2003.11
The use of highly active manganese (Mn)*, prepared by the Rieke method, was investigated for the direct preparation of benzylic manganese reagents. The oxidative addition of the highly active manganese to benzylic halides was easily completed under mild conditions. Moreover, benzylic manganese sulfonates and phosphates were prepared by direct oxidative addition of Mn* to the carbon–oxygen bonds of
Fluorous Synthesis of<sup>18</sup>F Radiotracers with the [<sup>18</sup>F]Fluoride Ion: Nucleophilic Fluorination as the Detagging Process
作者:Romain Bejot、Thomas Fowler、Laurence Carroll、Sophie Boldon、Jane E. Moore、Jérôme Declerck、Véronique Gouverneur
DOI:10.1002/anie.200803897
日期:2009.1.5
Tag team: The fluoro‐detagging of fluorous sulfonates by the [18F]fluoride ion was found to be an advantageous strategy for the preparation of various 18F‐labeled prosthetic groups and known radiotracers (see picture). Fluorous solid phase extraction (FSPE) was used to separate the excess fluorous precursor from the labeled material, which suggests that traditional purification protocols such as distillation
Pummerer Cyclization Revisited: Unraveling of Acyl Oxonium Ion and Vinyl Sulfide Pathways
作者:Xin Li、Rich G. Carter
DOI:10.1021/acs.orglett.8b02059
日期:2018.9.21
Two viable pathways (vinyl sulfide and acyl oxoniumion) for the Pummerer cyclization have been unraveled that expand the reaction scope and capabilities. Use of Brønsted-enhanced Lewis acidity was key to realization of the vinyl sulfide pathway, whereas selective complexation of the sulfur lone pair facilitated the unprecedented acyl oxoniumion pathway. Preliminary mechanistic investigations support
Nickel-catalyzed reductive monofluoroakylation of alkyl tosylate with bromofluoromethane to primary alkyl fluoride
作者:Ru Cui、Jie Sheng、Bing-Bing Wu、Duo-Duo Hu、Hong-Qian Zheng、Xi-Sheng Wang
DOI:10.1039/d1cc02837e
日期:——
A nickel-catalysed direct terminal monofluoromethlyation between alkyl tosylates and a low-cost, industrial raw material bromofluoromethane has been developed. This transformation has demonstrated high efficiency, mild conditions, and good functional-group compatibility. The key to success of this transformation lies in the ligand and mild base selection, ensuring the generation of various terminal