157634-01-0Relevant articles and documents
Synthesizing process of nitrogen-heterocyclic high-selectivity aldehyde
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Paragraph 0014; 0022; 0023; 0035; 0038; 0048; 0051, (2017/09/05)
The invention relates to a synthesizing process of nitrogen-heterocyclic high-selectivity aldehyde. The synthesizing process is characterized in that when nitrogen-heterocyclic nitrogen atoms have hydrogen atoms, pyrrole, piperidine and pyrazole are used as the initial raw materials, and the pyrrole, the piperidine and the pyrazole are allowed to have reaction with piperidine-1-formaldehyde under nitrogen atom protection to obtain required nitrogen-atom ortho-position aldehyde; when nitrogen-heterocyclic nitrogen atoms have no hydrogen atoms, pyridine and pyrimidine are used to have reaction with the piperidine-1-formaldehyde to obtain the required nitrogen-atom ortho-position aldehyde. The synthesizing process is simple to operate, few in steps and high in selectivity and is a universal method using nitrogen heterocycle to synthesize the nitrogen ortho-position aldehyde.
NHC-Catalyzed intramolecular redox amidation for the synthesis of functionalized lactams
Thai, Karen,Wang, Li,Dudding, Travis,Bilodeau, Francois,Gravel, Michel
supporting information; experimental part, p. 5708 - 5711 (2011/03/19)
A very efficient NHC-catalyzed lactamization reaction is reported. For most cases, the ring expansion reaction proceeds to cleanly furnish five- and six-membered N-Ts and N-Bn lactams, without the need for further purification. Evidence is presented suggesting a dual role for the stoichiometric base: (1) deprotonation of the triazolium precatalyst and (2) activation of the nitrogen leaving group through hydrogen bonding.
Ring-expansion of tertiary cyclic α-vinylamines by tandem conjugate addition to (p-toluenesulfonyl)ethyne and formal 3-aza-Cope rearrangement
Weston, Mitchell H.,Nakajima, Katsumasa,Parvez, Masood,Back, Thomas G.
, p. 3903 - 3905 (2007/10/03)
A novel ring-expansion protocol is based on the conjugate additions of cyclic α-vinylamines to (p-toluenesulfonyl)ethyne, followed by aza-Cope rearrangements of the resulting zwitterions, to afford medium and large-ring cyclic amines under remarkably mild
Photochemical reaction between tertiary allylic amines and chromium carbene complexes: Synthesis of lactams via a zwitterion aza cope rearrangement
Deur, Christopher J.,Miller, Michael W.,Hegedus, Louis S.
, p. 2871 - 2876 (2007/10/03)
Photolysis of chromium carbene complexes in the presence of tertiary allylic amines resulted in a zwitterionic aza Cope rearrangement to produce unsaturated lactams in fair yield.