Practical One-Pot Two-Step Protocol for the Microwave-Assisted Synthesis of Highly Functionalized Rhodanine Derivatives.

A fast and efficient protocol for the generation of substituted 5-arylidene rhodanines in a sequential one-pot two-step process combining the “Holmberg method” and the Knoevenagel condensation under microwave-assisted conditions has been developed. The final compounds 11a−k have been obtained in high yield and purity after a simple precipitation from methanol, making this procedure facile, practical, and rapid to execute.