Polyphosphoric Acid Trimethylsilyl Ester Promoted Intramolecular Acylation of an Olefin by a Carboxylic Acid:
Convenient Construction of C-18-Functionalized Δ14-Hecogenin Acetate
Wei Li and Philip L. Fuchs
Org. Lett., 2003, 5 (22), pp 4061–4064
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http://dx.doi.org/10.1021/ol035425f