Deoxygenative <i>gem</i>-difluoroolefination of carbonyl compounds with (chlorodifluoromethyl)trimethylsilane and triphenylphosphine
作者:Fei Wang、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.3762/bjoc.10.32
日期:——
phosphonium ylide represents one of the most straightforward methods. RESULTS: The combination of (chlorodifluoromethyl)trimethylsilane (TMSCF2Cl) and triphenylphosphine (PPh3) can be used for the synthesis of gem-difluoroolefins from carbonyl compounds. Comparative experiments demonstrate that TMSCF2Cl is superior to (bromodifluoromethyl)trimethylsilane (TMSCF2Br) and (trifluoromethyl)trimethylsilane
Chlorodifluoromethyl aryl ketones and sulfones as difluorocarbene reagents: The substituent effect
作者:Fei Wang、Laijun Zhang、Ji Zheng、Jinbo Hu
DOI:10.1016/j.jfluchem.2011.05.009
日期:2011.8
We have investigated the different chlorodifluoromethyl aryl ketones 1a-1g and sulfones 2a-2h as difluorocarbene reagents for O- and N-difluoromethylations. It was found that the sulfone reagents 2 were generally more efficient in difluoromethylation than the ketone reagents 1. Furthermore, while the different substituents on ketone reagents 1 did not show a remarkable impact on the difluoromethylation reaction, the substituent effect on the sulfone reagents 2 was much more significant. Finally, we found that p-chlorophenyl chlorodifluoromethyl sulfone 2d and p-nitrophenyl chlorodifluoromethyl sulfone 2h were among the most powerful difluorocarbene reagents in this category for O-difluoromethylations. (c) 2011 Elsevier B.V. All rights reserved.
Methyl-fluorinated Methyldiarylcarbinols and Related Compounds
作者:Ernst D. Bergmann、P. Moses、M. Neeman、S. Cohen、A. Kaluszyner、S. Reuter
DOI:10.1021/ja01572a051
日期:1957.8
10.1021/acs.orglett.4c01365
作者:Bai, Xiaoyan、Bai, Yuye、Li, Ya、Zhao, Cong、Du, Hongxuan、Li, Yibiao、Shen, Chengshuo、Zhang, Min、Chen, Lu
DOI:10.1021/acs.orglett.4c01365
日期:——
for chemoselective synthesis of α-halo-α,α-difluoromethyl ketones (−COCF3 and −COClCF2 motifs) from trimethyl(phenylethynyl)silane under catalyst-free and mild conditions. Commercially available Selectfluor or additional NaCl as halogen reagent was employed to complete this transformation, thereby demonstrating the potential synthetic value of this new reaction in organic synthesis.