Synthesis of Spirolactams from tyrosine amides and related substances
作者:Norbert A. Braun、Marco A. Ciufolini、Karl Peters、Eva-Maria Peter
DOI:10.1016/s0040-4039(98)00874-0
日期:1998.6
Oxidation of oxazolines derived from phenolic ω-arylalkanoic acids such as tyrosine with iodobenzene diacetate leads to spirocyclic amides in moderate yields. This reaction was heretofore unknown due to the propensity of free amide analogs of the oxazolines to furnish lactones upon oxidation.
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