Selective N-monoalkylation of aromatic amines with benzylic alcohols by a hydrogen autotransfer process catalyzed by unmodified magnetite
作者:Ricardo Martínez、Diego J. Ramón、Miguel Yus
DOI:10.1039/b901929d
日期:——
A new catalyst for an old material: magnetite is a good catalyst for the selective N-alkylation of aromatic amines using benzylic alcohols as electrophiles. The process could be repeated up to eight times without losing effectiveness. The catalyst recycling is very easy, using a simple magnet. The catalyst is selective and could discriminate between aromatic and aliphatic amines, as well as between benzylic and aliphatic alcohols, as the reactions only take place with aromatic amines and benzylic alcohols.
Impregnated Ruthenium on Magnetite as a Recyclable Catalyst for the N-Alkylation of Amines, Sulfonamides, Sulfinamides, and Nitroarenes Using Alcohols as Electrophiles by a Hydrogen Autotransfer Process
作者:Rafael Cano、Diego J. Ramón、Miguel Yus
DOI:10.1021/jo200559h
日期:2011.7.15
acid deprotection gave the expected primary amines in good yields. The ruthenium catalyst is quite sensitive, and small modifications of the reaction medium can change the final product. The alkylation of aminesusing potassium hydroxide renders the N-monoalkylated amines, and the same protocol using sodium hydroxide yields the related imines. The catalyst can be easily removed by a simple magnet and
Microwave-Assisted Domino Reactions of Propargylamines with Isothiocyanates: Selective Synthesis of 2-Aminothiazoles and 2-Amino-4-methylenethiazolines
作者:Daniele Castagnolo、Nicoló Scalacci、Chiara Pelloja、Marco Radi
DOI:10.1055/s-0035-1561985
日期:——
versatile microwave-assisted protocol for the synthesis of 2-aminothiazoles has been developed. The domino reaction of propargylamines and isothiocyanates in the presence of catalytic PTSA leads to the selective synthesis of 2-aminothiazoles at temperatures above 130 °C and in a few minutes. The same reaction carried out at lower temperatures leads to the formation of the tautomeric 2-amino-4-methylenethiazolines
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
A One-Pot Parallel Reductive Amination of Aldehydes with Heteroaromatic Amines
作者:Andrey V. Bogolubsky、Yurii S. Moroz、Pavel K. Mykhailiuk、Dmitriy M. Panov、Sergey E. Pipko、Anzhelika I. Konovets、Andrey Tolmachev
DOI:10.1021/co5000568
日期:2014.8.11
A parallel reductive amination of heteroaromatic amines has been performed using a combination of ZnCl2-TMSOAc (activating agents) and NaBH(OAc)(3) (reducing agent). A library of diverse secondary amines was easily prepared on a 50-300 mg scale.