Trifluoromethanesulfonylimides of arenehydroxamic acids and their aza Lossen rearrangement
作者:Lev M. Yagupolskii、Svetlana V. Shelyazhenko、Irina I. Maletina、Liubov V. Sokolenko、Alexander N. Chernega、Eduard B. Rusanov、Ivan F. Tsymbal
DOI:10.1016/j.jfluchem.2007.01.002
日期:2007.5
Trifluoromethanesulfonylimides of arenehydroxamic acids ArC(NSO2CF3)NHOH (1), analogues of arenehydroxamic acids, in which sp2 hybridized oxygen atom is replaced by the much stronger electron-withdrawing group NSO2CF3, have been synthesized, and the abilities of these compounds to undergo transformations similar to the Lossenrearrangement have been studied.
carbodiimides RN=C=NSO2CF3 are formed in high yield. In other words, an aza Curtiusrearrangement occurs. The carbodiimides react with water, alcohols, and secondary amines to give corresponding ureas, isoureas, and guanidine derivatives. Imidoyl chlorides with substituents other than SO2RF do not enter into the aza Curtius reaction.