Selective Magnesiation or Zincation of Highly Functionalized Alkenes and Cycloalkenes Using 2,2,6,6-Tetramethylpiperidyl Bases
作者:Tomke Bresser、Paul Knochel
DOI:10.1002/anie.201006641
日期:2011.2.18
Smooth and mild: Mg or Zn TMP bases (TMP=2,2,6,6‐tetramethylpiperidyl) allow the smooth metalation of various types of polyfunctional unsaturated substrates. Several sensitive functional groups such as ester, nitro, or trifluoromethylcarbonyl groups are tolerated. The new Zn or Mg intermediates undergo acylation, allylation, or cross‐coupling reactions in satisfactory yields.
Reactions of cyclic β-alkoxyvinyl α-keto esters with heteroaromatic NCC-binucleophiles
作者:Oleksandr O. Stepaniuk、Bohdan V. Vashchenko、Vitalii O. Matvienko、Ivan S. Kondratov、Andrey A. Tolmachev、Oleksandr O. Grygorenko
DOI:10.1007/s10593-020-02670-z
日期:2020.3
Reactions of five- and six-membered cyclic β-alkoxyvinyl α-keto esters and NCC-binucleophiles are described. The following binucleophiles were studied: heteroaromatic amines (pyrazoles, isoxazole, uracils, and isoquinolinone) and 2-(benzimidazolyl)acetonitrile. It was found that condensation proceeded regioselectively in the case of five-membered cyclic enone. Fused α-pyridine carboxylates, likely