Et<sub>3</sub>SiH + KO<sup>t</sup>Bu provide multiple reactive intermediates that compete in the reactions and rearrangements of benzylnitriles and indolenines
作者:Andrew J. Smith、Daniela Dimitrova、Jude N. Arokianathar、Kenneth F. Clark、Darren L. Poole、Stuart G. Leach、John A. Murphy
DOI:10.1039/d0sc04244g
日期:——
unusual because it generates multiple different types of reactive intermediates simultaneously that provide access to (i) silyl radical reactions, (ii) hydrogen atom transferreactions to closed shell molecules and to radicals, (iii) electron transfer reductions and (iv) hydride ion chemistry, giving scope for unprecedented outcomes. Until now, reactions with this reagent pair have generally been explained
We have developed a highly efficient and practical strategy for the kinetic resolution of indoline derivatives, involving a chiral Brønstedacid-catalyzed iminium ion formation and asymmetric transfer hydrogenation cascade process. The kinetic resolution allows the synthesis of 2-substituted N-benzylindolines in good yields with moderate to excellent enantioselectivities.
Attack of MeMgl and PhMgBr in toluene on spiro[cyclohexane-1,3′-3H-indole] (1) in the presence of Cu2-Cl2 gives 2′-substituted spiro[cyclohexane-1,3′-indolines] in quantitative yields. Also, attack of PhCH2CH2MgBr on 1 in the presence of Cu2Cl2 afforded 2′-phenethyl, 2′-H and 2′-benzyl (or 2′-p-xylyl) derivatives in toluene (or p-xylene) as solvent.
chiral diiron complexes exhibit efficient catalytic reactivity in dehydrogenative kineticresolution of indolines using environmentally benign hydrogen peroxide as oxidant. In particular, complex C9 bearing sterically encumbered salan ligands and a 2-naphthoate bridge is identified as the optimal catalyst in terms of chiral recognition. Further investigation reveals that this MMO mimic chiral catalyst
Light-driven redox deracemization of indolines and tetrahydroquinolines using a photocatalyst coupled with chiral phosphoric acid
作者:Qipeng Chen、Yuanli Zhu、Xujing Shi、Renfu Huang、Chuang Jiang、Kun Zhang、Guohua Liu
DOI:10.1039/d2sc06340a
日期:——
The integration of oxidation and enantioselective reduction enables a redox deracemization to directly access enantioenriched products from their corresponding racemates. However, the solution of the kinetically microscopic reversibility of substrates used in this oxidation/reduction unidirectional event is a great challenge. To address this issue, we have developed a light-driven strategy to enable