- An efficient in-situ reduction and cyclization reaction for the synthesis of 9-aryl-1,6,8,9-tetrahydro-7&ITH&IT-pyrazolo[3,4-&ITf&IT]quinolin-7-one, 11-aryl-1,6,7,8,9,11-hexahydro-10&ITH&IT-pyrazolo [3,4-&ITa&IT]acridin-10-one, and 11-aryl-3,6,7,8,9,11-hexahydro-10&ITH&IT-imidazo[4,5-&ITa&IT]acridin-10- one derivatives