This is the current state of organic chemistry research today; the field has matured so much, and existing areas are being farmed to such an extent that research groups are publishing basically identical work independent of each other (although I do not know that for sure, I give the authors the benefit of the doubt). As one of my coworkers mentioned, this is why the time for obtaining a PhD in organic chemistry has been increasing over the last few decades; increased competition results in many people around the world also working in your area of research, and potentially working on exactly the same thing you are working on!
This is also a reflection of the current “fluorine bubble” in organic chemistry research today. Due to the hype associated with fluorine, a lot of groups are now entering the area and rediscovering the wheel, so to speak. While there have been some nice breakthroughs recently (by Tobias Ritter and Melanie Sanford), most of the work done by newcomers in fluorine chemistry is overhyped.