Intramolecular cyclization of 2-biarylsulfonyl azides

Organic Dyes Containing Thieno[3,2-b]indole Donor for Efficient Dye-Sensitized Solar Cells

“…Various efficient organic dyes have been extensively investigated for the construction of DSSCs, and encouraging efficiencies have also been achieved . We have developed a series of carbazole-based organic dyes for efficient DSSCs in the past several years, − compared with the structure of carbazole, thieno[3,2- b ]indole’s structure (Figure ) is also based on the indole structure but in which a thiophene ring, instead of a second benzene ring, is fused onto the five-membered ring at the 2−3 position of the indole, , whereas organic dyes based on thieno[3,2- b ]indole moiety have been little studied to date. Taking account of the structure of thieno[3,2- b ]indole, which features a five-mumbered electron-rich thiophene ring, the stronger electron donating ability could be supposed than the carbazole moiety.…”

D–A conjugated polymers based on thieno[3,2-b]indole (TI) and 2,1,3-benzodiathiazole (BT) derivatives: synthesis, characterization and side-chain influence on photovoltaic properties

“…In present work, we report three polymers based on TI derivatives and DTBT derivatives as the structural analogues of PCDTBT (Scheme 2). Contrary to earlier reports, 37,38 the TI unit was synthesized via a simple method of Cadogan annulation. 39 In fact, there are few literature that reported TI unit in application of PSCs.…”

Synthesis of Fluorene and Indenofluorene Compounds: Tandem Palladium‐Catalyzed Suzuki Cross‐Coupling and Cyclization

“…Herein, we describe our results from our investigation into Pd(OAc) 2 /PCy 3 -catalyzed tandem reactions of 1,2-halobenzenes with 2-methylphenylboronic acids to access substituted fluorenes and indenofluorenes. [6][7][8] We anticipated that the challenge to realize a tandem Suzuki cross-coupling and cyclization proceeding through C À H activation would require achieving the C À H activation (Scheme 2; path b) while minimizing double Suzuki cross-coupling reaction (Scheme 2; path a). We reasoned that factors including ligand, base, and reaction temperature would influence the interaction of the Pd II center of intermediate I with the C À H bond and impact the cyclization proceeding through C(sp 3 ) À H bond activation.…”