Transition‐Metal‐Free Three‐Component Synthesis of Tertiary Aryl Amines from Nitro Compounds, Boronic Acids, and Trialkyl Phosphites
作者:Silvia Roscales、Aurelio G. Csáky
DOI:10.1002/adsc.201901009
日期:2020.1.7
aromatic amines is of continuous interest in chemistry. An exceptionally versatile three‐component reaction that directly transforms inexpensive nitro compounds, boronic acids, and trialkyl phosphites into tertiary aromatic amines has been realized. The reaction tolerates alkyl and aryl substituents on the nitro and boronic acid moieties, as well as functionalized phosphites. No transition‐metal catalysis
Hypervalent Iodine(III) Reagents as Safe Alternatives to α-Nitro-α-diazocarbonyls
作者:Ryan P. Wurz、André B. Charette
DOI:10.1021/ol034672g
日期:2003.6.1
A cyclopropanation reaction involving iodonium ylides generated in situ allows for efficient preparation of substituted 1-nitro-1-carbonyl cyclopropanes. This robust cyclopropanation reaction can be performed in organic solvents, biphasic aqueous media, or under solvent-free conditions with alkene substrates. The iodonium ylides generated in situ display some surprising differences in reactivity when
Formal Synthesis of Belactosin A and Hormaomycin via a Diastereoselective Intramolecular Cyclopropanation of an α-Nitro Diazoester
作者:Sébastien F. Vanier、Guillaume Larouche、Ryan P. Wurz、André B. Charette
DOI:10.1021/ol9026528
日期:2010.2.19
An efficient and convenient methodology for the synthesis of the 3-(trans-2-aminocyclopropyl) alanine and 3-(trans-2-nitrocyclopropyl) alanine moieties found in the core of belactosin A and hormaomycin, respectively, is reported. By using an enantioenriched substituted α-nitro diazoester in a diastereoselective intramolecular cyclopropanation reaction, the trans-nitrocyclopropyl alanine moiety can
Methyl 2‐nitroacetate (MNA) is not as good as methyl acetoacetate (MAA) in giving transesterification reactions with alcohols. While MAA is capable of thermal transesterification without catalyst, MNA gives superior nitroacetates only with the use of a catalyst. Decomposition of MNA into CO2, CH3OH, and CH3NO2 should be prevented.
2-硝基乙酸甲酯(MNA)在与醇进行酯交换反应方面不如乙酰乙酸甲酯(MAA)好。尽管MAA能够在没有催化剂的情况下进行热酯交换,但MNA仅在使用催化剂的情况下才能提供优异的硝基乙酸酯。应防止MNA分解为CO 2,CH 3 OH和CH 3 NO 2。
An efficient procedure for the esterification of nitroacetic acid: Application to the preparation of Merrifield resin-bound nitroacetate
Nitroacetic esters are prepared in good yield by reaction, at 0 degrees C, of nitroacetic acid with various alcohols in the presence of DCC, These reaction conditions were applied to the preparation of Merrifield resin-bound nitroacetate. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.