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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 4.

Scheme 4

aKey: (a) 2,6-di-tert-butyl-4-methylphenol, toluene, 130 °C, 24 h. (b) 2,6-di-tert-butyl-4-methylphenol, toluene, 150 °C, 24 h.