Nucleophilic Attack of Azide at Electrophilic Azides: Formation of N6 Units in Hexazene and Aminopentazole Derivatives

With the help of selective 15 N labeling experiments, it has been confirmed that nucleophilic attack of azide at iminium-activated organic azides leads to short-lived hexazene intermediates. Such species do not only tend to a cleavage reaction with formation of N-azido compounds, but also undergo ring closure to generate unprecedented amidino-functionalized pentazoles. Thus, treatment of the parent Vilsmeier reagent with two equivalents of sodium azide creates an aminopentazole derivative as the main product, which is easily characterized by NMR spectroscopy.

3,3-Diazidoenones – new types of highly reactive bis-azides. Preparation and synthetic transformations

A new family of highly reactive 3,3-diazidoenones was obtained. Their chemistry was investigated by both experimental studies and DFT calculations.

Synthesis of Geminal Azido-Halo Compounds and α-Azidoalkyl Esters from Aldehydes via α-Azido Alcohols

α-Azido alcohols are generated by treating aldehydes with hydrazoic acid in chloroform. These adducts are transformed into geminal azido-halo compounds through the reaction with phosphorus trichloride or phosphorus tribromide, whereas α-azidoalkyl esters are isolated after interaction with acyl chlorides.

Usual and unusual reactions of cyclohexane-1,2-dione with aryl azides and amines: a structural corrigendum

The products generated from cyclohexane-1,2-dione, amines and aryl azides do not contain bicyclic 1,2,3-triazine structures because cyclohexane-fused 4,5-dihydro-1,2,3-triazoles and monocyclic β-ketoamides are formed instead.