Abstract
An in-depth study of the reactions of 4-(ethynyl)-4-hydroxy-2,3-substituted-2-cyclobuten-1-ones with N-bromo- or N-iodosuccinimide, affording in most cases 2-halomethylene-4-cyclopentene-1,3-dione, is described. This reaction was used in a short total synthesis of methyl linderone.
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