used as an aza-Michael donor in organocatalyticasymmetricreactions with symmetric and nonsymmetric unsaturated 1,4-diketones. After hydrolysis (in situ), the N-substituted isatins were obtained in high yields (up to >95%) with high enantioselectivity (up to 95%). Isatin was activated by derivatization to a Schiff base with aniline and used as an aza-Michael donor in organocatalyticasymmetric reactions
Catalyst-Controlled, Enantioselective, and Diastereodivergent Conjugate Addition of Aldehydes to Electron-Deficient Olefins
作者:S. B. Jennifer Kan、Hiroki Maruyama、Matsujiro Akakura、Taichi Kano、Keiji Maruoka
DOI:10.1002/anie.201705546
日期:2017.8.1
A chiral-amine-catalyzed enantioselective and diastereodivergent method for aldehyde addition to electron-deficient olefins is presented. Hydrogen bonding was used as a control element to achieve unusual anti selectivity, which was further elucidated through mechanistic and computational studies.
Umsetzungen mit Nitroenaminen, XII. Umsetzung von Estern und Lactonen mit Nitroenaminen
作者:Holger Lerche、Dieter König、Theodor Severin
DOI:10.1002/cber.19741070511
日期:1974.5
Ester von Carbonsäuren sowie Lactone mit α-ständiger Methylen-Gruppe lassen sich über die Lithium-Salze mit 1-Dimethylamino-2-nitroäthylen oder 1-Dimethylamino-2-nitro-1-propen zu aci-Nitroäthyliden- bzw. aci-Nitropropyliden-Derivaten umsetzen (3 + 4 5). Die Verbindungen 5d – k gehen auf Kieselgel in die Ketoester 9d – k über.
One-pot synthesis of polysubstituted 3-acylpyrroles by cooperative catalysis
作者:Hai-Lei Cui、Fujie Tanaka
DOI:10.1039/c4ob01019a
日期:——
polysubstituted 3-acylpyrroles from readily available unsaturated ketones and N-substituted propargylated amines have been developed. An aza-Michael/alkyne carbocyclization cascade, by cooperative catalysis using pyrrolidine and a copper salt, followed by oxidation in situ gave 3-acylpyrroles, which were also transformed further to functionalized, highly substituted 3-acylpyrroles.
Selective assembly of saturated aza-heterocycles from β-functionally substituted enoates
作者:Ilya N. Zubkov、Alexey R. Romanov、Igor A. Ushakov、Alexander Yu Rulev
DOI:10.1016/j.tet.2019.130884
日期:2020.2
A highly selective synthesis of saturated aza-heterocycles from vicinal functionally substituted electron-deficient enoates and binucleophiles under classical and hyperbaric conditions is described. The assembly of the heterocyclic core proceeds through conjugate nucleophilic addition/cyclocondensation sequence.