One‐Pot Triple and Mixed Double Michael Addition of Activated Alkenes to 2‐Oxindole and 7‐Aza‐2‐Oxindole: Synthesis of C‐3/N‐Functionalized Carbon Rich 2‐Oxindole and 7‐Aza‐2‐Oxindole Derivatives - Kavitha Preethi, Raman; Kannadasan, Sathananthan; Shanmugam, Ponnusamy (ChemistrySelect, 2024)