G. Subramaniyan et R. Raghunathan, Synthesis of highly substituted spiropyrrolidines via 1,3-dipolar cycloaddition reaction of N-metalated azomethine ylides, TETRAHEDRON, 57(14), 2001, pp. 2909-2913
3-Arylidene-4-chromanones undergo regioselective 1,3-dipolar cycloaddition
reactions with N-metalated azomethine ylides derived from aromatic aldimine
s of glycine methyl ester in the presence of silver acetate and triethylami
ne to give spiropyrrolidine derivatives in good yield. X-Ray crystal struct
ure analysis of one of the products confirms the structure and regiochemist
ry of the cycloadditions. (C) 2001 Elsevier Science Ltd. All rights reserve
d.