作者:Pascal Dubé、Noah F. Fine Nathel、Michael Vetelino、Michel Couturier、Claude Larrivée Aboussafy、Simon Pichette、Matthew L. Jorgensen、Mark Hardink
DOI:10.1021/ol9023387
日期:2009.12.17
mediate the Lossenrearrangement of various hydroxamic acids to isocyanates. This process is experimentally simple and mild, with imidazole and CO2 being the sole stoichiometric byproduct. Significant for large-scale application, the method avoids the use of hazardous reagents and thus represents a green alternative to standard processing conditions for the Curtius and Hofmann rearrangements.
Iron(iii) catalysed synthesis of unsymmetrical di and trisubstituted ureas – a variation of classical Ritter reaction
作者:Hosamani Basavaprabhu、Vommina V. Sureshbabu
DOI:10.1039/c2ob06916d
日期:——
An application of the classical Ritter reaction for the synthesis of unsymmetrical di and trisubstituted ureas catalyzed by FeCl3 is described. The protocol is of significant interest in view of the easy availability of precursors, mild reaction conditions employed and interestingly its applicability for the alkylation of alcohols capable of forming stable carbocationic intermediates even to the sterically hindered moieties.