Abstract
L-α-Amino acids catalyze 1,3-dipolar cycloaddition of methyl α-benzylideneamino acids to electron-deficient olefins in different solvents at room temperature. L-α-Amino acids ensure stereoselective formation of the corresponding syn,syn-azomethine ylides. The subsequent reaction with an active dipolarophile is stereospecific; it occurs as endo-cycloaddition with low asymmetric induction (up to ee 12%.). 3,4-Substituted 5-arylprolines were obtained in preparative yields using L-pyroglutamic acid or L-proline as catalyst.
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Original Russian Text © K.V. Kudryavtsev, A.A. Zagulyaeva, 2008, published in Zhurnal Organicheskoi Khimii, 2008, Vol. 44, No. 3, pp. 384–393.
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Kudryavtsev, K.V., Zagulyaeva, A.A. 1,3-dipolar cycloaddition of schriff bases and electron-deficient alkenes, catalyzed by α-Amino acids. Russ J Org Chem 44, 378–387 (2008). https://doi.org/10.1134/S1070428008030123
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DOI: https://doi.org/10.1134/S1070428008030123