CYCLIZATION OF N-ALKYLAZINIUM CATIONS WITH BIFUNCTIONAL NUCLEOPHILES. 15. ISOMERIZATION OF THIAZOLOQUINOXALINES IN THE PRESENCE OF ACIDS

Article abstract of DOI:10.1007/BF00506677

4-Alkyl-2-phenyl-3a,4,9,9a-tetrahydrothiazolo<4,5-b>quinoxalines undergo isomerization in chloroform in the presence of acids to the regioisomeric (with respect to them) 9-alkyl-substituted derivatives.Under the same conditions 2,4-dimethyl-3a,4-9,9a-tetr