Any known bis-methylenedioxy compounds?

[GC_MS]

Making bis-methylenedioxy from sesamol seems more difficult.

Really?

1. Ortho-formylation of sesamol will give 2-hydroxy-4,5-methylenedioxybenzaldehyde
2. Baeyer-Villiger or Dakin of the latter will yield 4,5-methyelendioxpyrocatechol.
3. Methylenation of this catechol will give a bis-methylenedioxy compound.