A facile and one-pot synthesis of Nα-Fmoc/Bsmoc/Boc/Z-protected ureidopeptides and peptidyl ureas employing diphenylphosphoryl azide [DPPA]
作者:Vommina V. Sureshbabu、G. Chennakrishnareddy、N. Narendra
DOI:10.1016/j.tetlet.2007.12.060
日期:2008.2
Diphenylphosphoryl azide (DPPA) mediated one-pot synthesis of Nα-Fmoc/Bsmoc/Boc/Z-protected ureidopeptides and peptidyl ureas as well as phenyl/succinimidyl (Nα-urethane protected) methyl carbamates starting from Nα-protected amino acids is reported. The formation of an azide, its rearrangement and coupling with an amino component is accomplished in a sequence of one-pot operations. The protocol has
Tf2O‐Promoted Synthesis of Ureas, Carbamates and Thiocarbamate via Lossen Rearrangement: A Mechanistic Insight
作者:Eti Chetankumar、Chinthaginjala Srinivasulu、Ganga Periyasamy、Vommina V. Sureshbabu
DOI:10.1002/ejoc.202400028
日期:2024.4.15
A new and feasible synthetic method for ureas, carbamates and thiocarbamate from hydroxamic acid and Tf2O via Lossen rearrangement has been developed. The use of Tf2O was chemoselective with hydroxamate group with broad substrate applicability and good functional group tolerance. Further pathway of the mechanism was analysed through computational studies.