ChemInform Abstract: A Strategic Approach to the Synthesis of Novel Class of Dispiroheterocyclic Derivatives Through 1, 3 Dipolar Cycloaddition of Azomethine Ylide with (E)‐3‐Arylidene‐2, 3‐dihydro‐8‐nitro‐4‐quinolone. Issue 42 (1st October 2013)