49616-03-7Relevant articles and documents
SYNTHESIS AND REACTIONS OF 2,4-DISUBSTITUTED BENZOFURANO-, BENZOTHIENO- AND INDOLO-1,3-OXAZINIUM SALTS
Tolkunov, S. V.,Voshchula, V. N.,Zemskaya, E. A.,Dulenko, V. I.
, p. 1310 - 1312 (1990)
Under acid catalyzed acylation 3-acetamidobenzofuran, -benzothiophene, and -indole undergo heterocyclization to condensed 1,3-oxazinium salts.Treatment of the salts with ammonium acetate in acetic acid gives the corresponding benzofurano- and ben