Synthesis of 1,3,6-Trisubstituted Azulenes Based on the 1-Acyloxyazulene Scaffold
作者:Teppo O. Leino、Niklas G. Johansson、Lars Devisscher、Nina Sipari、Jari Yli-Kauhaluoma、Erik A. A. Wallén
DOI:10.1002/ejoc.201600962
日期:2016.11
An efficient synthetic route to 1,3,6-trisubstituted azulenes based on the 1-acyloxyazulene scaffold was developed. The 1-position in azulene was substituted in the ring-formation step with a functionalized acyloxy group. Additionally, the 3- and 6-positions of azulene were functionalized with versatile synthetic handles, a halogen atom and a formyl group.
A Ring Expansion−Annulation Strategy for the Synthesis of Substituted Azulenes. Preparation and Suzuki Coupling Reactions of 1-Azulenyl Triflates
作者:John L. Kane、Kevin M. Shea、Aimee L. Crombie、Rick L. Danheiser
DOI:10.1021/ol0156897
日期:2001.4.1
[structure: see text]. A new strategy for the synthesis of substitutedazulenes is reported, based on the reaction of beta'-bromo-alpha-diazo ketones with rhodium carboxylates. The key transformation involves intramolecular addition of a rhodium carbenoid to an arene pi-bond, electrocyclic ring opening, beta-elimination, tautomerization, and trapping to produce 1-hydroxyazulene derivatives. The synthetic