Scheme 1.
Synthetic route involved in the preparation of compounds 11–22.
Reagents and Conditions: (i) DBU, CHCl3, reflux; (ii) DBU, CHCl3, r.t.; (iii) DBU, CH3CN, reflux; (iv) Hg(OAc)2, NaOAc, CH3COOH, reflux; (v) DMAP, Ac2O, CHCl3, r.t.
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