23112-19-8Relevant articles and documents
Asymmetric synthesis of 4H-1,3-oxazines: Enantioselective reductive cyclization of N-acylated β-amino enones with trichlorosilane catalyzed by chiral Lewis bases
Sugiura, Masaharu,Kumahara, Mako,Nakajima, Makoto
supporting information; experimental part, p. 3585 - 3587 (2009/12/03)
N-Acylated β-amino enones reductively cyclize by treatment with trichlorosilane and a chiral Lewis base catalyst to afford optically active 4H-1,3-oxazines, which can be transformed to other chiral compounds without racemization.
Reactivite du nucleophile azoture vis-a-vis de cations heterocycliques aromatiques. VIII. Rearrangement de β-tetrazolo-trans-benzalacetophenones
Cherton, Jean-Claude,Bazinet, Marc,Bolze, Marie-Madeleine,Lanson, Marc,Desbene, Paul-Louis
, p. 2601 - 2607 (2007/10/02)
β-Tetrazolyl-trans-benzalacetophenones (T) isomerize upon heating into the corresponding azido-azomethines (A).These non-isolable products undergo various transformations depending on the reaction conditions.With organic bases such as triphenylphosphine or pyridine, their interception can occur.In aromatic solvents, a rearrangement involving loss of nitrogen leads to five-membered diazoted heterocycles: N-benzoyl imidazoles and pyrazoles, via intermediate diazirines and oxazepines.Protic solvents have been found to facilitate the isomerisation of tetrazoles into azidoazomethines.Solvolysis of the azidooxazine and in some cases of the oxazinium species resulting from the equilibrium and reaction: are then observed.