ChemInform Abstract: 3‐Cyanochromones in [3 + 2] Cycloadditions with an Azomethine Ylide Derived from Sarcosine and Formaldehyde. A Short Synthesis of 1‐Benzopyrano[2, 3‐c:3, 4‐c′]dipyrrolidines. Issue 21 (27th May 2014)