Abstract

PARIHAR, J. A.  and  RAMANA, M. M. V.. Short synthesis of new 13,16-diazaestrone and 13,16-diazaequilenin analogs. J. Braz. Chem. Soc. [online]. 2005, vol.16, n.4, pp. 881-883. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532005000500032.

Different 3-[2-(3,4-dihydro-1-naphthyl)ethyl]imidazolidine-2,4-diones and 3-[2-(1-naphthyl)ethyl]imidazolidine-2,4-diones, when heated in polyphosphoric acid at 150 °C, underwent chemoselective intramolecular cyclization to afford the 13,16-diazaestrone steroids and 13,16- diazaequilenin steroids respectively.

Keywords : polyphosphoric acid; chemoselective cyclization; 13,16-diazaestrone steroids; 13,16- diazaequilenin steroids.