Kj. Lee et al., Synthesis of 1,1-diheteroaryl ethylenes by a tandem Appel's dehydration/thermal rearrangement methodology, B KOR CHEM, 20(3), 1999, pp. 341-344
The hydrazones of 2-acetylfuran, 2-acetylthiophene, and 2-acetylpyrrole, we
re allowed to react with S-methylthioacetimidate hydroiodide (8) to give az
inoureas 10, and the reaction of 10 with Appel's dehydration conditions (tr
iphenylphosphine/carbon tetrachloride/triethylamine) led to the correspondi
ng azinocarbodiimides 11, which underwent thermal rearrangement under the r
eaction conditions to give 1,1-diheteroaryl ethylenes 13.