Chiral N-heterocyclic carbene ligands for asymmetric catalytic oxindole synthesis
作者:Yi-Xia Jia、J. Mikael Hillgren、Emma L. Watson、Stephen P. Marsden、E. Peter Kündig
DOI:10.1039/b810858g
日期:——
The Pd-catalysed asymmetric intramolecular alpha-arylation of amide enolates containing heteroatom substituents gives chiral 3-alkoxy or 3-aminooxindoles in high yield and with enantioselectivities up to 97% ee when a new chiralN-heterocycliccarbeneligand is used.
Facile and General Synthesis of Quaternary 3-Aminooxindoles
作者:Stephen P. Marsden、Emma L. Watson、Steven A. Raw
DOI:10.1021/ol801028e
日期:2008.7.3
valuable quaternary 3-aminooxindole skeleton is reported on the basis of intramolecular arylation of enolates of substituted amino acids. The reaction tolerates dialkyl- and arylalkylamines as well as a range of carbon substituents (primary and secondary alkyl, aryl). The cyclization of N-indolyl-substituted substrates is accompanied by direct C-H arylation of the indole, leading to indolo-fused benzodiazepines