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. Author manuscript; available in PMC: 2009 Dec 20.
Published in final edited form as: Tetrahedron. 2008 Dec 20;64(43):10041–10048. doi: 10.1016/j.tet.2008.08.043

Scheme 1.

Scheme 1

Reagents and conditions: (a) K2CO3/MeOH, rt, 4 h 65 % (12), 73 % (13), 58 % (15); (b) DBU (10 eq.), CH2Cl2, rt, 72 h 40 % (17), 24 h 70 % (18); (c) CDI, DMAP (cat.), CH2Cl2, reflux, 2 h, 80 %; (d) Ac2O/Py 1:2, rt, quant.; (e) n-Bu3SnH, AIBN (cat.), toluene, reflux, 6 h, 45 %.