A Facile Pathway to Enantiomerically Enriched 3-Hydroxy-2-Oxindoles: Asymmetric Intramolecular Arylation of α-Keto Amides Catalyzed by a Palladium-DifluorPhos Complex
作者:Liang Yin、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1002/anie.201102158
日期:2011.8.8
Less metal wastes: The first catalytic, enantioselective intramolecular aryl‐transfer reaction of aryl triflates to ketones has been developed (see scheme; R1=R2=aromatic and aliphatic). This method features overall practicality, including substrate stability and accessibility (protecting‐group free) plus no need for the use of stoichiometric amounts of metals.
减少金属废料:已开发出芳基三氟甲磺酸酯向酮的第一个催化,对映选择性分子内芳基转移反应(参见方案; R 1 = R 2 =芳族和脂族)。该方法具有整体实用性,包括基材稳定性和可及性(无保护基团),而且无需使用化学计量的金属。
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.
Rh(I)-catalyzed asymmetric addition of arylboronic acids to NH isatins
作者:Jiangyang Gui、Guihua Chen、Peng Cao、Jian Liao
DOI:10.1016/j.tetasy.2012.04.013
日期:2012.4
The transition metal-catalyzed asymmetric variant of the title reaction is normally limited to N-protected isatins. However, Rh(I)/chiral sulfoxide phosphine complexes were found to catalyze the enantioselective addition of arylboronicacids to NH isatins under mild conditions. A variety of chiral 3-aryl-3-hydroxyl-2-oxindoles were obtained with high yields and with good to excellent enantioselectivities
Rhodium-Catalyzed Addition of Arylboronic Acids to Isatins: An Entry to Diversity in 3-Aryl-3-Hydroxyoxindoles
作者:Patrick Y. Toullec、Richard B. C. Jagt、Johannes G. de Vries、Ben L. Feringa、Adriaan J. Minnaard
DOI:10.1021/ol0608101
日期:2006.6.1
[reaction: see text] A generalmethod for the catalytic 1,2-addition of aryl and alkenyl boronic acids to isatins is described using a rhodium(I)/triphenylphosphite catalyst. The application of this transformation allows the synthesis of a variety of 3-aryl-3-hydroxyoxindole building blocks in high yields. An enantioselective version of this reaction using a rhodium(I)/phosphoramidite system is also
Concave P-Stereogenic Phosphorodiamidite Ligands for Enantioselective Rh(I) Catalysis
作者:Nidal Saleh、Céline Besnard、Jérôme Lacour
DOI:10.1021/acs.orglett.4c00371
日期:2024.3.22
The development of a new class of concave P-stereogenic phosphorodiamidite ligands, derived from Tröger’s bases (TBs), is explored. These ligands, characterized by their remarkable stability and unique structural geometry around the P atom, are used in asymmetric Rh(I)-catalyzed additions of boronic acids to NH-isatins resulting in excellent reactivities and reasonable enantioselectivity (er up to