Chichibabin-Type Condensation of Cyclic Ketones with 3-R-1,2,4-triazin-5(4<i>H</i>)-ones

Reactions between substituted 1,2,4-triazines and ketones were investigated. General procedures for one-pot synthesis of hydrogenated derivatives of such polycyclic systems as benzo­[<i>c</i>]­[1,2,4]­triazino­[1,6-<i>a</i>]­[2]­azecine, [1,2,4]­triazino­[1,6-<i>f</i>]­phenantridine, and dicyclopenta­[<i>b</i>,<i>d</i>]­pyrido­[1,2-<i>f</i>]­[1,2,4]­triazine are described