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Paper | Special issue | Vol 97, No. 2, 2018, pp.1068-1081
Published online, 27th April, 2018
DOI: 10.3987/COM-18-S(T)89
Synthesis of 2-Amino-1-cyanoazulenes: Substituent Effect on 2H-Cyclohepta[b]furan-2-ones toward the Reaction with Malononitrile

Taku Shoji,* Shuhei Sugiyama, Kota Miura, Akira Ohta, Ryuta Sekiguchi, Shunji Ito, Shigeki Mori, and Tetsuo Okujima

*Department of Chemistry, Faculty of Science, Shinshu University, Asahi 3-1-1, Matsumoto, Nagano 390-8621, Japan

Abstract

3-Substituted 2-amino-1-cyanoazulene derivatives were prepared by the reaction of 2H-cyclohepta[b]furan-2-ones with malononitrile in the presence of triethylamine as a base. The great influence of the substituent at their 3-position on the reactivity to form the 2-aminoazulene derivatives was revealed. The intramolecular charge transfer (ICT) characters of 2-amino-1-cyano-3-vinylazulenes were investigated by UV/Vis spectroscopy and theoretical calculations. The structure of compounds 13b and 14b was clarified by single crystal X-ray analysis.