Chapter 3 Azulenes Fused to Heterocycles

Linderazulen aus einer invasiven Pflanze

“…Verschiedene Pflanzen bilden farblose sesquiterpenoide Vorstufen des Linderazulens, nicht aber Linderazulen selbst. Dazu gehört die Stängelumfassende Gelbdolde, auf die wir durch ein Buchkapitel über heterocyclisch annelierte Azulene von G. Fischer aufmerksam wurden . Seiner Frau verdanken wir Fotos der Pflanze aus Delphi, das im ursprünglichen Lebensraum der Pflanze liegt (Abbildung ).…”

Synthesis of Novel Thiophene-Fused 1,1’-Biazulene Derivative by the Reaction of Azuleno[1,2-b]thiophene with N-Iodosuccinimide

“…Azulene-fused heterocycles have attracted the interest owing to its unusual chemical properties. 6 Thus, preparation and reactivities of a number of azulene-fused heterocycles have already been revealed by many research groups. However, 1,1'-biazulene derivatives fused by heterocycles have never been reported so far, although several synthetic methodologies of 1,1'-biazulene derivatives have been found in the literatures as described above.…”

Synthesis of Azulene Derivatives from 2H-Cyclohepta[b]furan-2-ones as Starting Materials: Their Reactivity and Properties

“…As mentioned above, a variety of azulene derivatives have been prepared in recent years for the applications to pharmaceuticals and materials science, but for the applications preparation of more complex molecules is required. Although several reviews on the synthesis and reactivity of azulene and its derivatives have been reported, [ 19 , 20 , 21 , 22 ] there is still no comprehensive review that focuses on the synthesis using 2 H -cyclohepta[ b ]furan-2-ones as starting materials. Therefore, we believe that a systematic review for the synthesis of azulenes using 2 H -cyclohepta[ b ]furan-2-ones and their reactivity will be valuable for the future application of azulene derivatives to pharmaceuticals and organic materials.…”