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A novel synthetic route to substituted esters of imidazoles, oxazoles, thiazoles, and diethyl pyrazine-2,5-dicarboxylates via C-formylation of glycine ethyl ester hydrochloride is reported. This methodology is simple, robust, and gives good yields of different heterocyclic esters in one or two steps from a common acyclic precursor and is amenable to large scale synthesis.
A series of highly functionalised γ-hydroxyacryl γ-hydroxybutenolides, 2, were synthesised in 25–50% overall yields in two or three steps from 2-furfural using a tandem Baylis–Hillman-singlet oxygen oxidation reaction.
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