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2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

Amines to Amides: Acylation of Amines

Amines to Amides: Acylation of Amines

Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...

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Funcionalización desaminativa directa con las N-nitroaminas

Guangliang Tu¹, Ke Xiao¹, Xiaoping Chen¹

¹School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China.

|October 27, 2025

Resumen

Este resumen es generado por máquina.

Este estudio introduce un método de desaminación directa más seguro para las aminas aromáticas, convirtiendo los enlaces C-N en varios grupos funcionales. Este enfoque evita los productos intermedios de diazonio peligrosos, simplificando la química sintética.

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Área de la Ciencia:

Química orgánica
Química sintética
Química medicinal

Sus antecedentes:

Las aminas aromáticas son cruciales en las moléculas bioactivas.
Los métodos convencionales que utilizan sales de diazonio presentan riesgos de seguridad debido a su naturaleza explosiva.
Se necesitan métodos más seguros y versátiles para la funcionalización de aminas aromáticas.

Objetivo del estudio:

Desarrollar una estrategia deaminativa directa para la conversión de enlaces aromáticos C-N.
Establecer un protocolo unificado para acoplamientos cruzados deaminativos.
Para ofrecer una alternativa más segura a la química tradicional del diazonio.

Principales métodos:

Formación de N-nitroaminas a partir de aminas aromáticas.
Conversión directa de bonos C-N en bonos C-X y C-C.
Integración de la funcionalización desaminativa con la arylación catalizada por metales de transición.

Principales resultados:

Se desarrolló con éxito una estrategia de desaminación directa utilizando N-nitroaminas.
El protocolo permite la conversión de enlaces aromáticos C-N en diversos grupos funcionales (C-X, C-C).
El método demuestra versatilidad en varios derivados heteroaromáticos y de anilina.

Conclusiones:

El enfoque de desaminación directa ofrece una alternativa más segura y versátil a la química del diazonio.
Este método agiliza la síntesis y la funcionalización en etapa tardía de las moléculas bioactivas.
La reactividad de la N-nitroamina facilita las transformaciones equivalentes al catión arilo.