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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%), AgOTf (7 mol%), CH₂Cl₂, 4 Å MS powder, 25 °C, 24 h, 70% for 30 and 65% for 31. (b) Py·HF, THF:Py (5:1), 0 °C→25 °C, 4 h, 85% (c) NIS (3 eq.), TfOH (0.3 eq.), 4 days, 0 °C→25 °C, 24%.