Synthesis of Benzofuro- and Indolo[3,2-b]indoles via Palladium-Catalyzed Double N-Arylation and Their Physical Properties.
Two kinds of ladder-type π-conjugated compounds, benzofuro[3,2-b]indoles (BFIs) and indolo[3,2-b]indoles (IIs), were successfully synthesized using palladium-catalyzed double N-arylation of anilines with the corresponding dihalobiaryls. Photophysical properties were evaluated by UV-vis and photoluminescence spectroscopies and theoretical calculations. BFI derivatives showed higher quantum yields (33-39%) than the II derivative (29%). The absorption bands of the II derivative were more red-shifted compared to BFI derivatives.
Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
Minh Anh
MA
Truong
Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
Koji
K
Nakano