Synthesis of azulenes by the [6+ 4] cycloadditions of 6-aminofulvenes to thiophene S, S-dioxides

SE Reiter, LC Dunn, KN Houk

Index: Reiter,S.E. et al. Journal of the American Chemical Society, 1977 , vol. 99, p. 4199 - 4201

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Citation Number: 39

Abstract

Reaction conditions were not optimized, but reactions were followed by TLC until the developing azulene spot appeared to reach a maximum value and remained constant. Yields obtained by the previously preferred (highest yield and fewest steps) route. LT Scott, J. Chem. Soc., Chem. Commun., 882 (1973), from p-methyldihydrocinnamic acid. RW Alder and G. Whittaker, J. Chem. Soc., Perkin Trans. 2, 7 I4 (1975), via a modified Hafner ...