Efficient Synthesis of N-(Buta-2,3-dienyl) Amides from Terminal N-Propargyl Amides and Their Synthetic Potential Towards Oxazoline Derivatives.

A series of N-allenyl amides (III) prepared from N-propargyl amides (I) are efficiently transformed into the target oxazole derivatives by palladium-catalyzed coupling—cyclization reaction with organic iodides (IV).