The present Invention relates to substituted bicyclic Heterocyclic derivatives Condensed with 2 - (HET) aryl formula I where A1 and A4 is Nitrogen, N + - = - = C - R4 or R5 is \u2013n A2, A3 is Oxygen or Sulfur Oxygen A5 is R1 is H = C alkyl (C1 - C6), haloalquilo (C1 - C6), among others, or aril, hetar ILO, heterociclilo with mono - or polisustituidos halogeno, cyano, among others 2a, R2B, R3 and R4.If are independent between Hydrogen, cyano, among others R5 is alkyl (C1 - C6), haloalquilo (C1 - C6), among others n is 0, 1 or 2. It also refers to a procedure, Intermediates and use. These compounds have good Effectiveness as agents for Combating parasitic Animals, preferably as insecticides, acaricides and \/ orLa presente invencion se refiere a derivados de heterociclos biciclicos condensados sustituidos con 2-(het)arilo de formula I donde A1 y A4 es nitrogeno, =N+-O- o =C-R4A2 es –N-R5, oxigeno o azufre A3 es oxigeno A5 es =C-H R1 es alquilo (C1-C6), haloalquilo (C1-C6), entre otros o arilo, hetarilo , heterociclilo mono- o polisustituidos con halogeno, ciano entre otros R2a, R2b, R3 y R4, son independiente entre si hidrogeno, ciano, entre otros R5 es alquilo (C1-C6), haloalquilo (C1-C6), entre otros n es 0, 1 o 2. Tambien se refiere a un procedimiento, productos intermedios y uso. Dichos compuestos presentan buena eficacia como agentes para combatir parasitos animales, preferentemente como insecticidas y/o acaricidas
