Ligand-Accelerated Palladium(II)-Catalyzed Enantioselective Amination of C(sp<sup>2</sup>)–H Bonds
作者:Xiu-Fen Cheng、Fan Fei、Yan Li、Yi-Ming Hou、Xin Zhou、Xi-Sheng Wang
DOI:10.1021/acs.orglett.0c02216
日期:2020.8.21
The first example of the Pd(II)-catalyzed enantioselective amination of aryl C–H bonds is reported. The key to the successful realization of this asymmetric catalytic transformation was the identification of mono-N-protected α-amino-O-methylhydroxamic acid (MPAHA) ligands, which promote reactivity under mild conditions and control enantioselectivity. The counteranions in the solvent medium, hexafluoroacetylacetate
A Copper-Catalyzed Aerobic [1,3]-Nitrogen Shift through Nitrogen-Radical 4-<i>exo</i>
-trig Cyclization
作者:Yan Li、Rui Wang、Tao Wang、Xiu-Fen Cheng、Xin Zhou、Fan Fei、Xi-Sheng Wang
DOI:10.1002/anie.201709894
日期:2017.11.27
shift catalyzed by copper diacetate under an oxygen atmosphere (1 atm) has been developed for the construction of a diverse range of indole derivatives from α,α‐disubstituted benzylamine. In this reaction, oxygen was used as a clean terminal oxidant, and water was produced as the only by‐product. Five inert bonds were cleaved, and two C−N bonds and one C−C double bond were constructed in one pot during
Enantioselective CH Arylation Strategy for Functionalized Dibenzazepinones with Quaternary Stereocenters
作者:Tanguy Saget、Nicolai Cramer
DOI:10.1002/anie.201303816
日期:2013.7.22
Tada! Highly functionalized chiraldibenzazepinones are obtained by a mild palladium(0)‐catalyzed enantioselective CH arylation with excellent selectivities by using simple taddol phosphoramidite ligands. The amide tether allows exclusive regioselectivity through a rare eight‐membered palladacycle intermediate.
Intramolecular dehydrogenative cyclization involving twofold Csp2–H bond cleavages directed by the amino- or carboxy group proceeds smoothly when using a rhodium–copper catalyst system under air as the terminal oxidant. A variety of fluorene derivatives can be prepared by the environmentally benign procedure.
Pd(II)-Catalyzed Enantioselective C−H Olefination of Diphenylacetic Acids
作者:Bing-Feng Shi、Yang-Hui Zhang、Jonathan K. Lam、Dong-Hui Wang、Jin-Quan Yu
DOI:10.1021/ja909571z
日期:2010.1.20
Pd(II)-catalyzed enantioselective C-H olefination of diphenylaceticacid substrates has been achieved through the use of monoprotected chiral amino acid ligands. The absolute configuration of the resulting olefinated products is consistent with that of a proposed C-H insertion intermediate.