Sodium Hydroxide Catalyzed <i>N</i>-Alkylation of (Hetero) Aromatic Primary Amines and N<sub>1</sub>,C<sub>5</sub>-Dialkylation of 4-Phenyl-2-aminothiazoles with Benzyl Alcohols
作者:Ramachandra Reddy Donthiri、Venkatanarayana Pappula、Darapaneni Chandra Mohan、Hiren H. Gaywala、Subbarayappa Adimurthy
DOI:10.1021/jo400834h
日期:2013.7.5
of a catalytic amount of NaOH, the selective N-alkylation of various heteroaromatic primary amines is reported. With 1 equiv of NaOH, N1,C5-dialkylation of 4-phenyl-2-aminothiazoles has been investigated. Reaction of in situ generated aldehyde with amine yields the N-alkylated and N1,C5-dialkylated products through hydride ion transformation from alcohol.
Catalyst-free autocatalyzedN-alkylation of heteroarylamines with alcohols is achieved by tautomerization-induced ready generation of carbonyl intermediates from alcoholsviaTM-free MPV–O reaction.
An economically and environmentally sustainable synthesis of 2-aminobenzothiazoles and 2-aminobenzoxazoles promoted by water
作者:Xinying Zhang、Xuefei Jia、Jianji Wang、Xuesen Fan
DOI:10.1039/c0gc00418a
日期:——
Tandemreactions of isothiocyanates (1) with 2-aminothiophenols (2), or isothiocyanates (1) with 2-aminophenols (4), were carried out rapidly and efficiently in water. A significant rate acceleration of the reaction between 1a and 2a in water compared with commonly used volatile organic solvents was observed. Through these reactions, a variety of structurally and pharmaceutically interesting 2-aminobenzothiazoles
The synthesis of substituted benzimidazoles, 2-aminobenzimidazoles, 2-aminobenzothiazoles, and benzoxazoles is described via intramolecularcyclization of o-bromoaryl derivatives using copper(II) oxide nanoparticles in DMSO under air. The procedure is experimentally simple, general, efficient, and free from addition of external chelating ligands. It is a heterogeneous process and the copper(II) oxide
Copper‐catalyzed one‐pot coupling reactions of aldehydes (ketones), tosylhydrazide and 2‐amino(benzo)thiazoles: An efficient strategy for the synthesis of
<i>N</i>
‐alkylated (benzo)thiazoles
作者:Zengyang Xie、Ruijiao Chen、Mingfang Ma、Lingdong Kong、Jun Liu、Cunde Wang
DOI:10.1002/aoc.5124
日期:2019.10
An efficient and practical C–N bond formation methodology for the synthesis of N‐alkylated (benzo)thiazoles was developed, via the copper‐catalyzed one‐pot two‐step reactions of 2‐amino(benzo)thiazoles and aldehydes (ketones) with tosylhydrazide. This cross‐coupling reaction proceeded smoothly and tolerated a broad range of functional groups (46 examples). A variety of functionalized N‐alkylated (benzo)thiazoles