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. Author manuscript; available in PMC: 2017 Aug 16.
Published in final edited form as: J Med Chem. 2017 Jun 7;60(12):4805–4817. doi: 10.1021/acs.jmedchem.6b01336

Scheme 1. Synthesis of dihydropyridopyrimidines 3–3m and pyridine 3na.

Scheme 1

aReagents and reaction conditions: (a) Acetic acid, 110 °C, 6 h, N2, 11–81%; (b) Compound 3, chloranil, DMSO, rt, 2 h, 87%.