DOPAL NMR and phosphoric acid
Following up on our need for DOPAL in the malaria project, here is a good review of DOPAL syntheses, noting that the full characterization (including H NMR) was first made by Li et al in 1998. Unfortunately it is not a trivial synthesis and involves a very low yielding final step of deprotecting the methylenedioxy-protected catechol group, as Brett has noted previously.
They also link to a 1966 synthesis from adrenaline using phosphoric acid. This might be worth trying, since we still have some adrenaline, using chromatography to purify instead of the bisulfite adduct used in the paper.