tmp4Zr: An Atom-Economical Base for the Metalation of Functionalized Arenes and Heteroarenes
作者:Masilamani Jeganmohan、Paul Knochel
DOI:10.1002/anie.201003558
日期:2010.11.2
Zirconium bases reach lots of places: Only 25 % of zirconium metal is required for the metalation of various functionalized aromatic compounds and heterocycles. All four 2,2,6,6‐tetramethylpiperidyl (tmp) groups of the new basetmp4Zr⋅4 MgCl2⋅6 LiCl (1) are used up in the metalation process. The resulting zirconium species smoothly undergo palladium‐catalyzed cross‐couplings and addition to CO2 and
Regioselective magnesiations of functionalized arenes and heteroarenes using TMP<sub>2</sub>Mg in hydrocarbons
作者:Andreas Hess、Nurtalya Alandini、Hasret C. Guelen、Jan P. Prohaska、Paul Knochel
DOI:10.1039/d2cc03856k
日期:——
hydrocarbon-soluble magnesium amide TMP2Mg (TMP = 2,2,6,6-tetramethylpiperidyl). This base showed excellent properties for the regioselective magnesiation of various arenes and heteroarenes bearing ethyl esters and carbamates under very mild reaction conditions. Subsequent trapping with aryl iodides (Negishi cross-coupling) gave access to a range of highly functionalized valuable buildingblocks.