Here's a paradiddle-scale exercise I came up with to help work on that sort of articulation. This is also a great exercise for improving the slur-two, tongue-two articulation seen often in classical pieces.
Key of C Major:
I recommend working these up with a metronome, and then playing them over an Aebersold, sequencer, or another play-along track to get the feel of using them with a rhythm section.
Key of F Major:
For the complete exercise, download the free PDF sheetmusic.