Reaction of 1,4-Diaza-1,3-butadienes with Cyanotrimethylsilane. Synthesis of 2,3-Bis(arylamino)propenenitriles and Their Cyclization to 1,4-Diaryl-2,3-dioxo-5-pyrazinecarbonitriles
Reaction of 1,4-Diaza-1,3-butadienes with Cyanotrimethylsilane. Synthesis of 2,3-Bis(arylamino)propenenitriles and Their Cyclization to 1,4-Diaryl-2,3-dioxo-5-pyrazinecarbonitriles