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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Tetrahedron. 2010 Aug 1;66(33):6391–6398. doi: 10.1016/j.tet.2010.04.094

Scheme 2.

Scheme 2

aKey: (a) NaNO2, CAN, CH3CN, RT, 24 h, 56%; (b) toluene, 100 °C, 80 h, 78%; (c) n-Bu3SnH, AIBN, benzene, reflux, 2 h; (d) HF, CH3CN, 1 h.