generation of amines by palladium-catalyzed nucleophilic benzylic addition of 2-methyl-substituted azaarenes to N-sulfonyl aldimines under neutral conditions via C-H bondactivation has been developed. This reaction represents a very efficient methodology for the synthesis of heterocycle-containing amines and thus opens a new way to access amines through C-H bondactivation.
Iron-Catalyzed Direct Alkenylation of 2-Substituted Azaarenes with <i>N</i>-Sulfonyl Aldimines via C–H Bond Activation
作者:Bo Qian、Pan Xie、Yinjun Xie、Hanmin Huang
DOI:10.1021/ol200684b
日期:2011.5.20
A novel iron-catalyzed alkenylation of 2-substituted azaarenes through sp3 C–Hbondactivation has been developed. A favorable E2-elimination is proposed as a key step to cleavage of C–H and C–N bonds for the construction of a C═C bond in high stereoselectivity. This transformation represents an efficient way to synthesize 2-alkenylated azaarenes from simple starting materials.
Organocatalytic Tandem Three-Component Reaction of Imine, Alkyl Vinyl Ketone, and Imide via aza-Baylis−Hillman Reaction
作者:Siang-en Syu、Yu-Ting Lee、Yeong-Jiunn Jang、Wenwei Lin
DOI:10.1021/jo102143r
日期:2011.4.15
A highly chemoselective PPh3-catalyzed three-component reaction of an imine, alkyl vinyl ketone, and phthalimide or succinimide is developed. Various highly functional adducts with high diastereoselectivities can be generated via aza-Morita−Baylis−Hillman reactions of aryl-substituted imines and alkyl vinyl ketones followed by Michael additions of imides and then epimerization.
Y(OTf)3, were essential to promote the 1,4-addition of alkyl-substituted azaarenes to enones, and products were obtained in 60–96% yield. Lewis acid catalyzed benzylicC–H bond functionalization of alkyl-substituted azaarenes is described. The addition to N-tosyl imines proceeded under solvent-free conditions using various Lewis acids. Cu(OTf)2 was the best Lewis acid, and 1,2-addition proceeded at
Co(I)-Catalyzed [3 + 2] Annulation of <i>o</i>-Haloaryl Imines with Alkenes for the Synthesis of Indanamines
作者:Jérôme Paul、Lisa Luong Van My、Myriam Behar-Pirès、Coralie Guillaume、Eric Léonel、Marc Presset、Erwan Le Gall
DOI:10.1021/acs.joc.8b00551
日期:2018.4.6
The use of a CoBr2/1,10-phenanthroline catalytic system together with Zn as the reductant was developed to prepare diversely substituted indanamines by a Co(I)-catalyzed [3 + 2] annulation of o-haloaryl imines with electron-deficient alkenes in good yields. The use of Mn as the reductant allowed the elaboration of a three-component version of this reaction. These conditions were also found to be suitable