V. Y. Korotaev, A. Barkov, V. Moshkin
Oct 7, 2013
Citations
0
Influential Citations
27
Citations
Journal
Tetrahedron
Abstract
Reactions of 3-nitro-2-trifluoro(trichloro)methyl-2H-chromenes, including 2-unsubstituted derivatives, with N-alkyl-a-amino acids (sarcosine, proline) and paraformaldehyde proceed diastereoselectively to give 1-benzopyrano[3,4-c]pyrrolidines in good yields as a result of a 1,3-dipolar cycloaddition of the intermediate nonstabilized azomethine ylide at the D 3 -bond of the chromene system.