“…To overcome the limitation of harsh conditions led us to apply microwave-assisted chemistry; in fact, our efforts have not only led to improved yields but also opened new ways to the syntheses of otherwise hardly accessible polycyclic ring systems. [8,9] Further recent examples of type 2 tert-amino effect, including syntheses of pyrazolinoquinolizines and 1,4-oxazinopyrazolines, [10] 1,2-fused 5H-chromeno [4,3-b]pyridin-5-ones and 6H-benzo[h] [1,6] naphthyridin-5-ones, [11] naphthalenes, [12] a-carbolines, [13] and spirocyclic 1,2,3,4-tetrahydroquinolines, [14] also demonstrate the versatility of such reactions.…”