HETEROCYCLIC SYSTEMS CONTAINING BRIDGEHEAD NITROGEN ATOM. LXXVII: SYNTHESES OF THIAZOLO2,3-BBENZOFQUINAZOLIN-1(2H)-ONE AND 1,3THIAZINO2,3-BBENZOFQUINA ZOLIN-1(2H)-ONE, TWO NOVEL AND HITHERTO UNKNOWN HETEROCYCLIC SYSTEMS