106325-34-2Relevant academic research and scientific papers
Cyclotrimerization for the Synthesis of Cyclopropanes
Manna, Srimanta,Antonchick, Andrey P.
, p. 5290 - 5293 (2016)
The synthesis of small rings by functionalization of C(sp3)-H bonds remains a great challenge. We report for the first time a copper-catalyzed [1+1+1] cyclotrimerization of acetophenone derivatives under mild reaction conditions. The reaction has a broad scope for the stereoselective synthesis of cyclopropanes by trimerization of acetophenone. The developed transformation is based on an extraordinary copper-catalyzed cascade process that allows saturated carbocycles to be obtained for the first time by cyclotrimerization through functionalization of C(sp3)-H bonds. The cascade of sixfold C(sp3)-H bond functionalization allows the synthesis of cyclopropanes in a highly stereoselective approach. Give it a tri: Copper-catalyzed oxidative [1+1+1] cyclotrimerization of acetophenone derivatives under mild reaction conditions and with a broad reaction scope has been developed. This transformation is a radical cascade process that allows saturated carbocycles to be obtained by cyclotrimerization through functionalization of C(sp3)-H bonds.
Electrophilic and nucleophilic side chain fluorination of para-substituted acetophenones
Fuglseth, Erik,Thvedt, Thor H?kon Krane,M?ll, Maria F?rde,Hoff, B?rd Helge
, p. 7318 - 7323 (2008/12/21)
para-Substituted α-fluoroacetophenones have been synthesised by three different routes. Electrophilic fluorination of trimethylsilyl enol ethers of acetophenones using Selectfluor (F-TEDA-BF4, 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis-(tetrafluoroborate)) gave high to moderate yield depending on the electronic properties of the substituents. F-TEDA-BF4 mediated fluorination of acetophenones in methanol resulted in a mixture of α-fluoroacetophenones and the corresponding 2-fluoro-1,1-dimethyl acetals. The dimethyl acetals were hydrolysed using trifluoroacetic acid in water to maximise the yield of the product. Nucleophilic fluorination of α-bromoacetophenones using tetrabutylammonium hydrogen bifluoride (TBABF) led to moderate yield when having electron-donating substituents, whereas low yields were experienced when more electron-withdrawing substituents were introduced.
