Sulfur-mediated annulation of 1,2-phenylenediamines towards benzofuro- and benzothieno-quinoxalines

Abstract

<p>Oxidation of sp³ C–H bonds in acetophenones is exploited to annulate with 1,2-phenylenediamines.</p>

Metal-free construction of dihydropyrazino[2,3-b]indoles from 2-aminoacetophenones, isocyanates and 1,2-diamines

“…10 Therefore, there is a significant demand for the development of synthetic methodologies for the preparation of functional pyrazino[2,3- b ]indoles. 11…”