I really recommend not to wear nitrile or any gloves while dealing with DCM... DCM goes straight through them and therefore has longer contact. I think this route is very complex for no reason... maybe just nice to use glassware

Anyways I recommend just dissolve all your 5meodmt in MeOH, adjust ph to 12 with NaOH or Na2CO3, distill MeOH out and recrystallise what's left over with boiling hexane or heptane. You will get beautiful crystals at easily 90%+ yield
