INTRAMOLECULAR HETEROCYCLIZATION OF o-(1-CYCLOALKENYL)ANILINES 2*. SYNTHESIS OF NEW 4Н-3,1-BENZOXAZINE AND 4Н-3,1-BENZOTHIAZINE 2-AMINO DERIVATIVES

Abstract

A new method was developed to synthesize 2-amino derivatives of 3,1-benzoxazines and 3,1-benzothiazines on the basis of о-(cyclopent- 1-en-1-yl)aniline by heterocyclization of phenyl- and allylurea and thiourea derivatives in the presence of CF₃CO₂H, H₂O₂, or Br₂.