Hypervalent iodine oxidation of indolic 2-oxazolines
作者:Norbert A. Braun、Jonathan D. Bray、Marco A. Ciufolini
DOI:10.1016/s0040-4039(99)00872-2
日期:1999.7
A novel oxidation of indolic 2-oxazolines with iodobenzene diacetate leads to unusual spiroheterocycles of potential interest in synthetic and medicinal chemistry. In several instances, addition of 2,2,2-trifluoroethanol (the solvent for such oxidations) to the substrates was observed. (C) 1999 Elsevier Science Ltd, All rights reserved.
New Oxidative Transformations of Phenolic and Indolic Oxazolines: An Avenue to Useful Azaspirocyclic Building Blocks
作者:Norbert A. Braun、Malika Ousmer、Jonathan D. Bray、Denis Bouchu、Karl Peters、Eva-Maria Peters、Marco A. Ciufolini
DOI:10.1021/jo000341v
日期:2000.7.1
The oxidative cyclization of a phenolic amide to a spirolactam has long been regarded as an "impossible" reaction, because exposure of the substrates to a variety of oxidants results in formation of spirolactones with consequent loss of the amine segment. We recently communicated that this heretofore unknown transformation may be achieved by oxidation of oxazoline analogues of phenolic and indolic