A nanoscale iron catalyst for heterogeneous direct <i>N</i>- and <i>C</i>-alkylations of anilines and ketones using alcohols under hydrogen autotransfer conditions
作者:Madhu Nallagangula、Chandragiri Sujatha、Venugopal T. Bhat、Kayambu Namitharan
DOI:10.1039/c9cc04120f
日期:——
report a commercially available nanoscale Fe catalyst for heterogeneous direct N- and C-alkylation reactions of anilines and methyl ketones with alcohols. A hydrogen autotransfer mechanism has been found to operate in these reactions by deuterium labelling studies. In addition, dehydrogenative quinoline synthesis has been demonstrated from amino benzyl alcohols and acetophenones.
efficient and practical transition-metal-free CsOH/O2 catalyst system was developed for the N-alkylation of amines with alcohols under argon. This strategy was compatible with many alcohols and exhibits excellent functional group tolerance. More significantly, the selective formation of secondary amines was achieved in excellent yields. The detailed mechanistic study gave a clear understanding of the role
N‐alkylation reaction of aromatic amines was achieved using aliphatic, aromatic, and heteroaromatic alcohols as the alkylating reagent. A variety of aniline derivatives, including heteroaromatic amines, underwent the N‐alkylation reaction and furnished the corresponding monoalkylated products in good to excellent yields. The application of the reaction is also further demonstrated by the synthesis of a 2‐phenylquinoline
A new protocol for the alkylation of aromaticamines has been described using alcohols in the presence of SmI2 as a catalyst with the generation of water as the sole byproduct. The reaction proceeds under MW conditions and selectively generates monoalkylated amines. This protocol features a broad substrate scope and good functional-group tolerance with moderate to high yields.
Convenient and Reusable Manganese‐Based Nanocatalyst for Amination of Alcohols
作者:Murugan Subaramanian、Palmurukan M. Ramar、Ganesan Sivakumar、Ravishankar G. Kadam、Martin Petr、Radek Zboril、Manoj B. Gawande、Ekambaram Balaraman
DOI:10.1002/cctc.202100635
日期:2021.10.19
Nanocatalytic Amination: Herein, a reusable heterogeneous N-doped graphene-based manganesenanocatalyst (Mn@NrGO) for selective N-alkylation of amines with alcohols is described. The heterogeneous nature of the catalyst made it easy to separate for long-term performance, and the recycling study revealed that the catalyst was robust and retained its activity after several recycling experiments.