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. Author manuscript; available in PMC: 2009 Dec 8.

Published in final edited form as: Tetrahedron Lett. 2008 Dec 8;49(50):7157–7160. doi: 10.1016/j.tetlet.2008.09.164

Scheme 1 — Reactions and Reagents. (a) AgClO₄, SnCl₂, dry CH₂Cl₂, 4Ǻ Mol sieves, rt, overnight, 9: 97%, 12: 80%. (c) AcCl/MeOH/CH₂Cl₂ (1:20:20 v/v), rt, overnight, 10: quantitative yield, 13: 86%. (b) DAST, NBS, dry CH₂Cl₂, −20 °C, 4 h, 11: 91%, 14: 84%. (d) Cp₂HfCl₂, AgOTf, dry CH₂Cl₂, 4A Mol sieves, rt, overnight, 61%.