Nucleophilic and electrophilic substitutions of difluoropropargyl bromides
作者:Gerald B. Hammond
DOI:10.1016/j.jfluchem.2005.12.024
日期:2006.5
electrophilically substituted difluoropropargyl derivatives via magnesium and fluoride promoted reactions. An indium-mediated reaction of silyldifluoropropargyl bromide, followed by electrophilic trapping with bromine led to a very useful bromoallene, which was then used in reactions with nucleophiles (C, O, N, P, S, Hal) to yield a de facto bimolecular nucleophilic substitution of a difluoropropargyl
Stereoselective Functionalization of Racemic Cyclopropylzinc Reagents via Enantiodivergent Relay Coupling
作者:Lun An、Fei-Fei Tong、Shu Zhang、Xingang Zhang
DOI:10.1021/jacs.0c04462
日期:2020.7.8
cyclopropylzinc reagents. This strategy relies on a one-pot, two-step enantiodivergent relay coupling (EDRC) process of the racemic cis-cyclopropylzinc reagents with two different electrophiles, which involves kinetic resolution of racemic cis-cyclopropylzinc reagents through a nickel-catalyzed enantioselective coupling with alkyl electrophiles, followed by a stereospecific relay coupling of the remaining
Supported gold nanoparticles catalyzed cis-selective semihydrogenation of alkynes using ammonium formate as the reductant
作者:Shengzong Liang、Gerald B. Hammond、Bo Xu
DOI:10.1039/c6cc01318j
日期:——
nanoparticles with low loading (0.5 mol %) are able to semihydrogenate non-fluorinated and gem-difluorinated alkynes to cis-alkenes with high selectivity, using cost-effective and easy-to-handle ammoniumformate as...
and other areas, methods to access various fluorinated compounds are needed. Herein, we report the synthesis of difluoropropargyl vinyl ethers from ketones and aldehydes using difluoropropargyl bromide dicobalt complexes. We applied difluoropropargyl vinyl ethers to the synthesis of difluorodienone or difluoroallene under thermal conditions and trifluoro-pyran under acid-catalyzed conditions.
Concise Preparation of 2,2-Difluorohomopropargyl Carbonyl Derivatives. Application to the Synthesis of 4,4-Difluoroisoquinolinone Congeners
作者:Satoru Arimitsu、Begoña Fernández、Carlos del Pozo、Santos Fustero、Gerald B. Hammond
DOI:10.1021/jo7025965
日期:2008.4.1
of 2,2-difluorohomopropargyl esters was achieved using a magnesium-promoted Barbier reaction of substituted difluoropropargyl bromides with alkyl chloroformates. These 2,2-difluorohomopropargyl esters were effective precursors in the synthesis of homopropargylic amidesby aminolysis using AlMe3, as well as of ketonesthrough the reaction of the corresponding Weinreb amides with Grignard reagents. Ring