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. Author manuscript; available in PMC: 2010 Sep 9.
Published in final edited form as: J Am Chem Soc. 2009 Sep 9;131(35):12576–12578. doi: 10.1021/ja9058926

Scheme 3a.

Scheme 3a

aKey: (a) xylene, reflux, 36 h. (b) 0.05 M HCl, THF, 2 h, 67% for 2 steps. (c) nBu3SnH, AIBN, benzene, reflux, 2 h, 89%. (d) TFAA, benzene, Dean-Stark, 24 h, 60%. (e) toluene, 130 °C, 36 h, 90%. (f) nBu3SnH, AIBN, benzene, reflux, 2 h. (g) HF, CH3CN, rt, 10 min, 53% for 2 steps.