Acetic Acid Mediated Coupling of 2-Aminonicotinamides with Ortho Esters: A Convenient, Scalable Synthesis of 2,3-Substituted Pyrido[2,3-d]pyrimidines - Chan, Johann; Gustin, Darin; Divirgilio, Evan; Guram, Anil; Faul, Margaret M (Synthesis, 2007)