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    A Novel Method for the Synthesis of Newfangled Asymmetric Schiff Bases from -amino Acids under Ultrasonic Conditions and in Aqueous Medium
    (Wiley-V C H Verlag Gmbh, 2016) Şendil, Kıvılcım; Tekin, Turgay; Göksu, Haydar; Oğuz, Mehmet; Anıl, Barış; Gültekin, Mehmet Serdar
    Chiral Schiff bases were obtained at high yields via a novel technique. Aryl aldehydes and chiral -amino acids were treated (1) in the presence of H3PO4 in ethanol at 80 degrees C for 24 h, and (2) in the presence of K2CO3 under ultrasonic conditions in an aqueous ethanol medium within 5 min with yields reaching up to 96%. The results showed that the presented methodology under ultrasonic conditions was effective, practical, and eco-friendly compared to that using an acidic medium. The corresponding asymmetric Schiff bases were synthesized for the first time, and were characterized by H-1 and C-13 nuclear magnetic resonance and infrared spectroscopy and high-resolution mass spectrometry.