Naruto

That is exactly what they are trying to achieve, in order to avoid the main problem of anime adaptations of unfinished manga, because if the anime catches up to the manga, they will either have to introduce a long filler arc to create a gap, or come up with the plot themselves. This happened, for example, with Soul Eater and Fullmetal Alchemist; in the first case, after episode 36, it became complete nonsense, and in the second case, they are currently remaking it based on the manga.