Synthesis of Tetraazacalix[2]arene[2]triazines: Tuning the Cavity by the Substituents on the Bridging Nitrogen Atoms
摘要:
A number of tetraazacalix[ 2] arene[ 2] triazines bearing different substituents on the bridging nitrogen atoms were synthesized efficiently using a fragment coupling strategy. The N- arylation of the parent azacalix[ 2] arene[ 2] triazine afforded tetra( arylaza) calix[ 2] arene[ 2] triazine in 91% yield. The introduction of different substituents on the bridging positions led to the regulation of the cavity of the resulting macrocyclic molecules.
Synthesis of N,N′-bis-[3-alkoxy-4-(hydroxy, alkoxy, acyloxy)-phenylmethylene- and -Phenylmethyl]-1,3-phenylenediamines
摘要:
Starting with the vanillin series aldehydes, by reaction with 1,3-phenylenediamine in absolute methanol E,E-N,N'-bis-[3-alkoxy-4-(hydroxy-, alkoxy-, acyloxy)phenylme-thylene]-1,3-phenyl-enediamines (Shiff bases) are synthesized from reduction with Na[BH(OAc)(3)] in benzene were prepared respective N,N'-bis-[3-alkoxy-4-(hydroxy-, alkoxy-, acyloxy)phenylmethyl]-1,3-phenyl-enediamines.
The Iridium-Catalyzed Synthesis of Symmetrically and Unsymmetrically Alkylated Diamines under Mild Reaction Conditions
作者:Stefan Michlik、Toni Hille、Rhett Kempe
DOI:10.1002/adsc.201100554
日期:2012.3.16
An iridium catalyst – stabilized by an anionic P,N ligand – was used for the symmetrical and unsymmetrical monoalkylation of para‐, meta‐, and ortho‐benzenediamines. Benzyl and aliphatic alcohols were used as alkylating reagents. 28 derivatives were synthesized. 14 of them are new compounds. Furthermore, the alkylation of the pharmacological important diamine Dapson® (dapsone) is described. 14 dapsone
Switchable imine and amine synthesis catalyzed by a tripodal ligand-supported well-defined cobaltcomplex is presented herein. A large variety of primary alcohols and amines were selectively converted to imines or amines in good to excellent yields. It is discovered that the base plays a crucial role on the selectivity. A catalytic amount of base leads to the imine formation, while an excess loading
Room temperature and solvent-free iridium-catalyzed selective alkylation of anilines with alcohols
作者:Jia-Qi Li、Pher G. Andersson
DOI:10.1039/c3cc42669f
日期:——
A bidentate iridium NHC–phosphine complex has been developed and applied to the N-monoalkylation of aromatic amines with a wide range of primary alcohols and to the N-heterocyclization of amino alcohols. This reaction resulted in high isolated product yields, even at room temperature and under solvent-free conditions.
Base-mediated cascade amidination/<i>N</i>-alkylation of amines by alcohols
作者:Chunyan Zhang、Zuyu Liang、Fenghong Lu、Xiaofei Jia、Guoying Zhang、Mao-Lin Hu
DOI:10.1039/d0cc04831c
日期:——
amidination/N-alkylation reaction of amines by alcohols has been developed. For the first time, nitriles have been identified as an efficient and benign water acceptor reagent in N-alkylation. Notably, the procedure tolerates a series of functional groups, such as methoxyl, halo, vinyl and hetero groups, providing a convenient method to construct different substituted diamino compounds, 15N labeled
sustainable or green reaction that has received a lot of attention in recent years and is preferentially catalyzed by Ir or Ru complexes is the alkylation of amines by alcohols. It is based on the borrowing hydrogen or hydrogen autotransfer concept. Herein, we report on the Co‐catalyzed alkylation of aromaticamines by alcohols. The reaction proceeds undermildconditions, and selectively generates monoalkylated