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. 2008 Dec 31;19(4):1126–1128. doi: 10.1016/j.bmcl.2008.12.103

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Copyright © 2009 Published by Elsevier Ltd.

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Scheme 1 — Synthesis of 3–5. Reagents and conditions: (a) Ac₂O, pyridine, rt, 8 h; yield 92%. (b) TMS-acetylene, Pd(PPh₃)₄, Et₃N, DMF, 40 °C, 8 h; yield 87%. (c) KF, 10% MeOH in CH₂Cl₂; yield 80%.