@article{oai:soar-ir.repo.nii.ac.jp:00011826,
 author = {Shoji,  Taku and Inoue,  Yuta and Ito,  Shunji},
 issue = {12},
 journal = {TETRAHEDRON LETTERS},
 month = {Mar},
 note = {Azulene derivatives reacted with 2-indolinones in the presence of triflic anhydride (Tf2O) to afford 1-(indo1-2-yl)azulenes in good yields. In the cases of the reaction of 6-tert-butyl-1-(methylthio)azulene (11) and 1-(1,4-dihydropyridin-4-yl)azulene 14, 1,1'-biazulene derivative 24 and 1-(indo1-2-yl)azulene (2) were obtained under the similar reaction conditions, respectively, instead of the presumed electrophilic substitution products., Article, TETRAHEDRON LETTERS. 53(12):1493-1496 (2012)},
 pages = {1493--1496},
 title = {First synthesis of 1-(indo1-2-yl)azulenes by the Vilsmeier-Haack type arylation with triflic anhydride as an activating reagent},
 volume = {53},
 year = {2012}
}