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- [9] 1,3-Dipolar Cycloaddition of 3-Amino Oxindole-Based Azomethine Ylides and O-Vinylphosphonylated Salicylaldehydes for Diastereoselective Synthesis of Oxindole Spiro- P , N -polycyclic Heterocycles SYNTHESIS-STUTTGART, 2020, 52 (09): : 1387 - 1397