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Synthesis of Diastereomeric 5-Ethyl-6-phenyl-4-phenylethynyl-1,4-dihydropyridines Using the Hantzsch Reaction and Resolution by Crystallization (R1 = C≡C–Ph)a
a Reagents: (a) toluene, NaOAc, 90 °C, 4 h; (b) EtOH, 80 °C; (c) crystallization; (d) THF, 25 °C, 1 N HCl.
