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Beilstein J. Org. Chem. 2011, 7, 1173–1181, doi:10.3762/bjoc.7.136
Graphical Abstract
Scheme 1: Selected resonance structures of azulene (1a) and structure of the sesquiterpene guaiazulene (1b).
Scheme 2: Synthesis of ynones by glyoxylation–decarbonylative Sonogashira coupling.
Scheme 3: Retrosynthetic analysis of N-heterocyclic substituted azulenes by a one-pot four-component approach....
Scheme 4: Three-component synthesis of azulenyl- and guaiazulenylynones 3 by glyoxylation–decarbonylative Son...
Scheme 5: Four-component synthesis of pyrimidylazulenes 5 by glyoxylation–decarbonylative Sonogashira couplin...
Scheme 6: Four-component synthesis of pyrazolylazulenes 7 by glyoxylation–decarbonylative Sonogashira couplin...