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(A) Medicinally relevant 1,4-dioxane rings. (B) Traditional synthetic approaches. (C) Synthesis of 1,4-dioxanes from prefunctionalized oxetane ethers. [BA]* = chiral Brønsted acid catalyst. (D) Lewis-acid-catalyzed synthesis of dihydrobenzofurans and indolines from oxetanols and phenols. (E) This work: synthesis of 1,4-dioxanes directly from oxetanols and 1,2-diols using Brønsted acid catalysis.
