A convenient synthesis of phthalides [isobenzofuran-1(3H)-ones] from o-halogenobenzyl alcohols is described. This method is then applied to the synthesis of methyl di-O-methylporphyrilate (methyl 1,3-dihydro-4,10-dimethoxy-8-methyl-3-oxoisobenzofuro[5,4-b]benzofuran-7-carboxylate)(2), a derivative of the lichen dibenzofuran porphyrilic acid (1).
M. V. Sargent, J. Chem. Soc., Perkin Trans. 1, 1987, 231 DOI: 10.1039/P19870000231
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