Organic Letters
Letter
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(22) There are many examples in the literature. For a selection of
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(10) Tejedor, D.; Delgado-Hernandez, S.; Peyrac, J.; Gonzalez-
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(11) For selected examples, see: (a) Xie, P.; Yang, J.; Zheng, J.;
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(13) The reaction of 2,2,4,6-tetramethylpyran and dimethyl
acetylenedicarboxylate has been reported to generate acetone and
dimethyl 3,4-dimethylphthalate in undetermined amounts, along with
other products from decomposition of the starting pyran. Hussman,
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(14) The efficiency of the propargyl Claisen rearrangement of PVEs
is facilitated by the degree of substitution on the PVE: higher
substitution leads to lower temperatures and higher efficiencies.
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(15) For selected recent syntheses of 1,2,4-benzenetricarboxylate
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(16) (a) For a review of metal-free formal [2 + 2 + 2]
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