The preparation of the selenium-bridged bisquinolone 5 has been invest
igated. Compound 5 was methylated giving the N-methyl derivative 6. Co
mpound 5 and phosphorus oxychloride yielded 4-chloroquinoline 8 which
was converted to novel selenium heterocycles 7,11 and 12 and the 4-phe
noxy product 9.