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. 2017 Jan 25;8:14019. doi: 10.1038/ncomms14019

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Copyright © 2017, The Author(s)

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Reagents and conditions: (a) AuCl₃ (7 mol%), CH₂Cl₂, 4 Å MS powder, 25 °C, 2 h, 84%. (b) Py·HF, THF:Py (5:1), 0 °C→25 °C, 4 h, 95%. (c) Br₂, CH₂Cl₂, 4 Å MS powder, 10 min, 0 °C followed by propargyl alcohol, 2,6-lutidine, tetrabutylammonium iodide, 0 °C→25 °C, 12 h, 85% for 23 and 88% for 6. (d) AuCl₃ (7 mol%), AgOTf (7 mol%), CH₂Cl₂, 4 Å MS powder, 25 °C, 12 h, 84%.