4-Halo-1,3-oxazoles: Unambiguous structural assignment of 2-halo-2-benzoyl-2H-azirine-3-carboxylates thermal ring expansion products
作者:Susy Lopes、Cláudio M. Nunes、Rui Fausto、Teresa M.V.D. Pinho e Melo
DOI:10.1016/j.molstruc.2008.08.014
日期:2009.2
IR spectroscopy in cryogenic argon matrix of methyl 4-chloro-5-phenyl-1,3-oxazole-2-carboxylate and methyl 4-chloro-5-phenylisoxazole-3-carboxylate was applied for the structural assignment of these isomeric heterocycles. It was demonstrated that methyl 2-benzoyl-2-halo-2H-azirine-3-carboxylates undergo thermal ring expansion to give 4-halo-5-phenyl-1,3-oxazole-2-carboxylates and not the isomeric isoxazoles. (c) 2008 Elsevier B.V. All rights reserved.
Synthesis of 2-halo-2H-azirines
作者:Teresa M.V.D Pinho e Melo、Cláudia S.J Lopes、Ana L Cardoso、António M.d'A Rocha Gonsalves