Seven different types of benzannulated N-heterocycles indolines, dihydropyrrolopyridines, benzimidazolines, dihydrobenzo-3, 1-oxazines, benzomorpholines, tetrahydroquinolines, and tetrahydroisoquinolines can be obtained from simple dinucleophiles and electron- deficient acetylenes in one synthetic step. This powerful methodology was made possible through the use of diphenylphosphinopropane (DPPP) as the catalyst, with acetic acid ...
