Jasium, I told you 2 times in PM's to DISTILL the raw Isosafrole, and in the write-up in "the Sequel" you can read very well in BOLD characters that you must always DISTILL your Isosafrole to get rid of any unreacted Safrole and more importantly, any KOH. If there is KOH left in your Isosafrole, then you can forget any good yields in the next steps, conversion to MDP2P and especially the imine forming from your MDP2P.
Washing your Isosafrole/KOH with water or brine(concentrated NaCl/water) will saddle you up with an immens emulsion, which is very difficult to clean up. Only if you really don't have any form of vacuum you should try it, but in fact, if you want to do a performic and the amination it would be very strange to even think about not using vacuum distillation, you need it in several steps.
The use of brine is redundant here, it will not remove any KOH. Only a shitload of slightly acidic water solution(5%) could do the trick to convert the KOH to the salt, which would then solute in the wash water. Strong acids would be dangerous to use, the double bond bridge in your Iso would break up. So no HCl or H2SO4 5% solutions. And with weaker acids you really would need immens amounts of 5% solutions to get all the KOH converted to salt.
So, always use DISTILLATION, under vacuum is ofcourse far better than plain atmospheric distillation. LT/
WISDOMwillWIN