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. Author manuscript; available in PMC: 2009 Nov 24.
Published in final edited form as: Tetrahedron. 2008 Nov 24;64(48):10791–10797. doi: 10.1016/j.tet.2008.09.011

Scheme 3.

Scheme 3

Reagents and conditions: (a) TBDMSCl, imidazole, DMF; (b) (i) NaOH, MeOH, rt; (ii) CS2, MeOH, 145 °C, 18 h; (iii) H2O2, MeOH, 0 °C, 2h; (iv) NH3, MeOH, 125 °C, 18 h.