99601-60-2Relevant academic research and scientific papers
Synthesis of 2-Methyl-4H-1,3-benzoxazin-4-ones and Related Compounds
Stegmann, Hartmut B.,Klotz, Dieter,Weiss, Joachim E.
, p. 4632 - 4636 (2007/10/02)
4H-1,3-benzoxazin-4-ones 2 are smoothly prepared via (acylimino)phosphoranes 1 by intramolecular condensation analogous to a Wittig reaction.Tert. phosphanes are used for the preparation of the (acylimino)phosphoranes 1 which are converted into the corresponding benzoxazines and tert. phosphane oxides, e.g. 2-methyl-4H-1,3-benzoxazin-4-one (2a) which, in spite of some attempts, has not been obtained before.
