2-Azido-3-arylacrylates react with alpha-diazocarbonyl compounds and triphenylphosphine to furnish isoquinolines in 60-92% yields. The tandem process involves a Wolff rearrangement, an aza-Wittig reaction, and an electrocyclic ring closure. The procedure is efficient, rapid, and general, and the substrates are readily available.
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Yang et al. (2008) studied this question.
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