Ring expansion-annulation strategy for the synthesis of substituted azulenes and oligoazulenes. 2. Synthesis of azulenyl halides, sulfonates, and azulenylmetal …

AL Crombie, JL Kane, KM Shea…

Index: Nozoe, Tetsuo; Wakabayashi, Hidetsugu; Ishikawa, Sumio; Wu, Chi-Phi; Yang, Paw-Wang Heterocycles, 1990 , vol. 31, # 1 p. 17 - 22

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Citation Number: 57

Abstract

... Volume: Page: ... treatment of the cinnamic acid with a solution of anhydrous HBr in dichloromethane in the presence of silica gel 31 (10 g ... with oxalyl chloride and then diazomethane furnishes the expected β-bromo diazo ketones in good overall yield (Table 1). ...