85257-32-5Relevant academic research and scientific papers
A novel synthesis of coumarins employing triphenyl(α-carboxymethylene)phosphorane imidazolide as a C-2 synthon
Upadhyay, Puspesh K.,Kumar, Pradeep
scheme or table, p. 236 - 238 (2009/05/11)
A novel one-pot synthesis of coumarins via intramolecular Wittig cyclization from the reaction of phenolic compounds containing ortho-carbonyl group and triphenyl(α-carboxymethylene)phosphorane imidazolide is described.
Hydrolyse de merocyanines en series azaheterocycliques
Maguet, Michel,Guglielmetti, Robert
, p. 323 - 326 (2007/10/02)
The permanent merocyanines and the photomerocyanines obtained by uv irradiation of spirochromenes are easily hydrolyzed.In the oxazolidine and oxazine series, aminoesters whose configuration has been checked by 1H nmr have been isolated.Their formation involves a tetrahedral intermediate similar to those postulated in the hydrolysis of oxazolinium and oxazinium salts.These aminoesters are themselves easily transformed into coumarins.In the thiazolidine and thiazine series the permanent merocyanines are hydrolyzed into phenols by way of a retro Bertagnini-Perkin reaction.
