Nickel-Catalyzed Mizoroki–Heck/Amination Cascade Reactions of <i>o</i>-Dihaloarenes with Allylamines: Synthesis of Indoles
作者:Xu Chen、Jin Lin、Biao Wang、Xu Tian
DOI:10.1021/acs.orglett.0c02909
日期:2020.10.2
An efficient Mizoroki–Heck/amination cascade reaction of o-dihaloarenes with allylamines has been developed using nickel and IPr carbene ligand as catalyst. This protocol enables the synthesis of a broad range of substituted indoles by a cascade process, from readily available starting materials. Mechanistic studies suggest that the Mizoroki–Heck reaction occurred first under IPr-nickel catalysis.
Various atropisomeric amides were prepared in optically pure forms (≥98% ee) through the opticalresolution of the amide ester derived from (R)-pantolactone, N-allyl-ortho-tert-butylaniline and oxalyl chloride. Asymmetric carbonyl addition reaction of an alkyllithium and asymmetric iodolactonization with these atropisomeric amides proceeded with high stereoselectivity.
new axially chiral N-acryl-N-allyl-o-tert-butylanilide wih high optical purity (96–97 %ee) was prepared in good yield from (S)-O-acetyl lactic acid and N-allyl o-t-butylaniline. Iodinemediated Diels-Alderreaction of the axially chiral N-acryl anilide with cyclopentadiene or isoprene proceeded with high diastereoselectivity.
Palladium-Catalyzed Amidation of Unactivated C(sp<sup>3</sup>)H Bonds: from Anilines to Indolines
作者:Julia J. Neumann、Souvik Rakshit、Thomas Dröge、Frank Glorius
DOI:10.1002/anie.200903035
日期:2009.9.1
Unreactive CH to attractive CN: A palladium‐catalyzed intramolecular direct amidation of unactivated C(sp3)Hbonds combines CH activation and CN bond formation into one efficient process. Under the optimized conditions, an extraordinary tolerance of functional groups was observed, and numerous indoline derivatives were formed (see scheme).
New axially chiral N-acryl-N-allyl-o-tert-butylanilide and N-(o-tert-butylphenyl)-2-methylmaleimide with high optical purity and definite absolute configurations were prepared from o-tert-butylaniline and (S)-O-acetyl lactic acid or (R)-2-methylsuccinic acid, respectively. Iodine- or Lewis acid-mediated asymmetricDiels-Alderreaction of these axially chiral compounds with various dienes proceeded