4-Amiomoindan (I) is reacted with benzoylisothiocyanate (II) to give the benzoylthiourea (III), which after hydrolysis of 4-indanyltiourea (IV) is methylated with iodomethane to (V). The free base (VI) is cyclized with ethyldiamine (A) and p-toluenesulfonic acid to indanazoline
By reacting 1-acetyl-2-imidazolidinone (VII) with 4-aminoindan (I) and POCl3 at 50 C 1-acetylindanazolidine (VIII) is synthesized, which gives indanazoline by hydrolysis