Azide monoliths as convenient flow reactors for efficient Curtius rearrangement reactions
作者:Marcus Baumann、Ian R. Baxendale、Steven V. Ley、Nikzad Nikbin、Christopher D. Smith
DOI:10.1039/b801634h
日期:——
The preparation and use of an azide-containing monolithic reactor is described for use in a flow chemistry device and in particular for conducting Curtiusrearrangement reactions via acid chloride inputs.
Curtius Rearrangement of Aromatic Carboxylic Acids to Access Protected Anilines and Aromatic Ureas
作者:Hélène Lebel、Olivier Leogane
DOI:10.1021/ol0622920
日期:2006.12.1
The reaction of a chloroformate or di-tert-butyl dicarbonate and sodium azide with an aromatic carboxylic acid produces the corresponding acyl azide, presumably through the formation of an azidoformate. The acyl azide undergoes a Curtius rearrangement to form an isocyanate derivative which is trapped either by an alkoxide or by an amine to form the aromatic carbamate or urea. The reaction conditions