

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.
Keywords
benzothiazine; benzoxazine; о-(cyclopent-1-en-1-yl)aniline; intramolecular heterocyclization
Latvian Institute of Organic Synthesis - Aizkraukles iela, 21, Riga, LV-1006, Latvia - hgs@osi.lv