Abstract
Abstract 7‐Hydroxy‐6‐methylphthalide 2 was synthesized with high regioselectivity and moderate yield using a novel one‐pot synthesis that employed 3‐hydroxy‐4‐methylbenzylalcohol 1 and formaldehyde in the presence of tin(IV) chloride as catalyst and triethylamine as base. The proposed mechanism of the formation of 2 involves ortho‐formylation followed by hemiacetal formation and oxidation.
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