Solid Hardwood, Engineered and Laminate Flooring - The right tool for the job

Hello, I could use some help. I am remodeling an old home and the house has been through several "remodels" in the past. We removed the carpet to find beautiful hardwood floors. I also found an area where there used to be a wall. well the previous owner scabbed in scrap wood to fill the gap in the flooring. There used to be a doorway in the old wall, so there is a section of the hardwood floor still in tact. Well instead of trying to match this wood, we decided to cut out the small section that filled the doorway and run a different type of wood perpendicular to the existing run of hardwood. Now for my problem. in order to accomplish the cut out mentioned above I had to "widen" the cutout to 8 inches for the seperation of the two rooms. Now my problem is that I can not cut the existing flooring all the way up to the wall with my circular saw. The closest I can get to the wall is 2 and a half inches. So my questioin is what kind of saw and blade do I use to cut the existing hardwood planks next to the wall? If I can add anything to the description above to help answer my question, please let me know!
Thanks in advance!
Robert

Jigsaw with a flushcut blade?

I am not familiar with that type of blade. Is it shallow enough to cuth through the 3/4 inch flooring and not bounce off the subfloor?

May have to put a block of the right size underneath the saw, to keep it from cutting to deep. I know the feeling, i hate flush cutting problems.

Thanks,
I would not have thought about the block. I will give it a try!