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) - Sosnovskikh, Vyacheslav Ya.
Abstract 3‐Substituted chromones undergo [3 + 2] cycloaddition with an azomethine ylide to produce benzopyranopyrrolidine derivatives (IV, isolated as hydrochlorides) in a diastereoselective manner.