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Dynamic trapping as a selective route to renewable phthalide from biomass-derived furfuryl alcohol

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Author(s)

Christopher S. Lancefield, Bart Fölker, Razvan C. Cioc, Katarina Stanciakova, Rosa E. Bulo, Martin Lutz, Marc Crockatt, Pieter C.A. Bruijnincx

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Abstract

A novel route for the production of the versatile chemical building block phthalide from biorenewable furfuryl alcohol and acrylate esters is presented. Two challenges that limit sustainable aromatics production via Diels–Alder (DA) aromatisation—an unfavourable equilibrium position and undesired regioselectivity when using asymmetric addends—were addressed using a dynamic kinetic trapping strategy. Activated acrylates were used to speed up the forward and reverse DA reactions, allowing for one of the four DA adducts to undergo a selective intramolecular lactonisation reaction in the presence of a weak base. The adduct is removed from the equilibrium pool, pulling the system completely to the product with a fixed, desired regiochemistry. A single 1,2-regioisomeric lactone product was formed in up to 86 % yield and the acrylate activating agent liberated for reuse. The lactone was aromatised to give phthalide in almost quantitative yield in the presence of Ac2O and a catalytic amount of strong acid, or in 79 % using only catalytic acid.

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Details

Original languageEnglish
Number of pages6
JournalAngewandte Chemie - International Edition
VolumeEarly View
Early online date15 Oct 2020
DOIs
Publication statusE-pub ahead of print - 15 Oct 2020

    Research areas

  • Biomass, Dehydration, Diels–Alder reactions, Lactonisation, Sustainable chemistry

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