5-Bromo-1-(2-bromo-4,5-methylenedioxyphenyl)-7,8-methylenedioxynaphthalene-2,3-dicarboxylic acid anhydride, previously obtained from piperonal in three steps, was converted to (±)-otobain by consecutive treatment with sodium amalgam, lithium aluminium hydride, toluene-p-sulphonyl chloride, and lithium aluminium hydride.
I. Maclean and R. Stevenson, J. Chem. Soc. C, 1966, 1717 DOI: 10.1039/J39660001717
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