3D-Printing inside the Glovebox: A Versatile Tool for Inert-Gas Chemistry Combined with Spectroscopy
作者:Felix Lederle、Christian Kaldun、Jan C. Namyslo、Eike G. Hübner
DOI:10.1002/hlca.201500502
日期:2016.4
glovebox. During pauses of the print, the reaction flasks out of acrylonitrile butadiene styrene were filled with various reactants. After the basic test reactions to proof the oxygen tightness and investigations of the influence of printing within an inert‐gas atmosphere, scope and limitations of the method are presented by syntheses of new compounds with highly reactive reagents, such as trimethylaluminium
Chemoselective Transfer of Allyl or Phenyl Group from Allyl(phenyl)germanes in Pd-catalyzed Reactions with Aryl Halides
作者:Jean-Philippe Pitteloud、Yong Liang、Stanislaw F. Wnuk
DOI:10.1246/cl.2011.967
日期:2011.9.5
Treatment of chloro(phenyl)germanes with allylmagnesium bromide yielded allyl(phenyl)germanes. Coupling of the allyl(phenyl)germanes with aryl halides in 1,4-dioxane in the presence of aqueous NaOH and Pd catalyst resulted in Heck-type transfer of the allyl group providing the corresponding allylated aryls. On the other hand, reaction of allyl(phenyl)germanes with SbF5 intercalated in graphite in toluene and subsequent treatment of the resulting germanyl fluorides with TBAF generates reactive hypervalent fluorogermanates that undergo Stille-like Pd-catalyzed cross-coupling with aryl halides in wet toluene to provide biaryls.
Cascade Radical Cyclizations via Biradicals Generated from (<i>Z</i>)-1,2,4-Heptatrien-6-ynes
作者:Kung K. Wang、Zhongguo Wang、Anna Tarli、Peter Gannett
DOI:10.1021/ja9622620
日期:1996.1.1
acyclic enyne−allene 4 underwent intramolecular transformations in a sequence with an initial Myers cycloaromatization to form α,3-didehydrotoluene biradical 5 followed by a 5-exo cyclization of the benzenoid radical center in 5 to produce 6. Biradical 6 then decayed through a 1,5-hydrogen shift to furnish o-quinodimethane 7, which in turn was captured in an intramolecular Diels−Alder reaction to afford
methylenation of acyl fluorides and acyl chlorides with substituted with aryl, alkenyl, and alkyl groups trimethylaluminum afforded an array of 2-substituted propene derivatives. The addition of a catalytic amount of DPPM increased an efficiency of the reactions. Trimethylaluminum as the methylenation reagent not only eliminates the presynthesis of methylene transfer reagent, but provides an efficient method for
Copper-Catalyzed Intermolecular Reductive Radical Difluoroalkylation–Thiolation of Aryl Alkenes
作者:Weiguang Kong、Changjiang Yu、Hejun An、Qiuling Song
DOI:10.1021/acs.orglett.8b02091
日期:2018.8.17
A novel radical-involved alkene difunctionalization catalyzed by the copper/B2pin2 system has been developed, leading to the difluoroalkylation–thiolation of aryl alkenes. The use of B2pin2 as an organic reductant enables the simultaneous installation of a C(sp3)–C(F2R) bond and a C(sp3)–S(R) bond across the C═C bond of aryl alkenes by utilizing two electrophilic reactants. The reaction exhibits broad