Ir-Catalyzed Reversible Acceptorless Dehydrogenation/Hydrogenation of N-Substituted and Unsubstituted Heterocycles Enabled by a Polymer-Cross-Linking Bisphosphine
作者:Deliang Zhang、Tomohiro Iwai、Masaya Sawamura
DOI:10.1021/acs.orglett.0c01905
日期:2020.7.2
Notably, this protocol is applicable to the dehydrogenation of N-substituted indoline derivatives with various N-substituents with different electronic and steric natures. A reaction pathway involving oxidative addition of an N-adjacent C(sp3)–H bond to a bisphosphine-coordinated Ir(I) center is proposed for the dehydrogenation of N-substituted substrates.
Pd-Catalyzed Dearomative Carboxylation of Indolylmethanol Derivatives
作者:Tsuyoshi Mita、Sho Ishii、Yuki Higuchi、Yoshihiro Sato
DOI:10.1021/acs.orglett.8b03337
日期:2018.12.7
By using a new catalytic system (PdCl2[P(n-Bu)(3)](2) in combination with ZnEt2), various 3-indolylmethanol derivatives were successfully carboxylated with CO2 (1 atm) via dearomatization of the indole nucleus, affording 3-methyleneindoline-2-carboxylates. In contrast, carboxylation of 2-indolylmethanol derivatives afforded unexpected doubly carboxylated products, which are useful synthetic precursors for biologically active compounds.
Indoles Synthesized from Amines via Copper Catalysis
作者:Ronald Besandre、Miguel Jaimes、Jeremy A. May
DOI:10.1021/ol400444g
日期:2013.4.5
N-Substituted indoles are synthesized from primary amines through a tandem reaction sequence. Initial condensation of the amine with an alpha-(o-haloaryl)ketone or aldehyde is followed by intramolecular aryl amination catalyzed by CuI. A variety of anilines and alkyl amines, including those with significant steric demands, are converted to indoles in high yields and with varying indole substitution.