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. Author manuscript; available in PMC: 2015 Feb 5.
Published in final edited form as: Tetrahedron Lett. 2014 Jan 3;55(6):1154–1158. doi: 10.1016/j.tetlet.2013.12.081

Scheme 3.

Scheme 3

Reagents and conditions: (a) POCl3, reflux, 80 °C for 18–24 h; (b) ethylenediamine, ethanol, reflux, 36–48 h.