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New amino acid—1,2,3-triazolium conjugates were synthesized by establishing a 1,2,3-triazolium unit to the amino acid through Cu-catalyzed alkyne-azide cycloaddition and subsequent N-methylation. These products were applied as ionic-liquid-tagged organocatalysts in asymmetric direct aldol reactions. Remarkably, a lysine-derived conjugate performed better than proline derivatives. Evidence was found...
Optically active nitroalkenes 4 were synthesized via Henry reaction. Conjugate addition of vinylmagnesium bromide to 4 gave nitroalkane syn-5 while cyclopropanation with sulfur ylides or dibromocarbene afforded nitrocyclopropanes 8, 10 and 11 in a diastereoselective manner. These products were used to synthesize optically active β-amino acids 7 and 16 as well as cyclopropane γ-amino acids 19 and 20...
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