Controllable Regioselective Construction of Both Functional α-Methylene-β- and -γ-amino Acid Derivatives Through an Organocatalyzed Tandem Allylic Alkylation and Amination
A new controllable and regioselectiveallylicalkylation and amination reaction has been developed for the highly selective construction of compounds containing α-alkylidene-β-amino acid and α-methylene-γ-butyrolactam moieties. Furthermore, on the basis of this controllable strategy, multicomponent tandem reactions have also been accomplished. The subsequent transformations of the densely functionalized
A carbon dioxide-promoted three-component Strecker reaction
作者:Ruslan V. Fauziev、Roman E. Ivanov、Ilya V. Kuchurov、Sergei G. Zlotin
DOI:10.1039/d1gc03161a
日期:——
but also as a reaction promoter via in situ formation of carbonic acid which provides a gradual release of the true cyanating agent (HCN) from available KCN. The reaction conditions (pressure, temperature, and concentrations of reagents) were optimized, and various aromatic and aliphatic amines and aldehydes were transformed into valuable α-amino nitriles including prospective pharmacological substances
from the same N-allyl precursor by stereodivergent alkene isomerization. The reaction, formally a nucleophilic substitution at an sp2 carbon atom, allows the direct regioselective incorporation of mono-, di-, tri-, and tetrasubstituted olefins at the α-carbon of amino acid derivatives. The initially formed 5-alkenyl iminohydantoins may be hydrolyzed and oxidatively deprotected to yield hydantoins and unsaturated
Strecker-Type Reaction Catalyzed by Carboxylic Acids in Aqueous Media
作者:Gang Zhao、Jide Wang、Zhengfeng Xie、Guilong Li
DOI:10.1055/s-0029-1216805
日期:2009.6
Carboxylic acid catalyzed Strecker-type reactions were successfully carried out by simply mixing aldehydes, amines, tributyltin cyanide and carboxylic acid in aqueous media at room temperature, to afford α-aminonitriles in high yields.