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- [43] Copper(I)-Catalyzed [3+2]Cycloaddition/Ring-Opening Rearrangement/[4+2]Cycloaddition/Aromatization Cascade: An Unprecedented Chemo- and Stereoselective Three Component Coupling of Sulfonyl Azide, Alkyne and N-Arylidenepyridin-2-amine to Pyrido[1,2-a]pyrimidin-4-imine ADVANCED SYNTHESIS & CATALYSIS, 2013, 355 (01) : 93 - 98