Revamping the Synthesis of N-Heterocycles

Revamping the Synthesis of N-Heterocycles

Author: Stuart Beardsworth

Single fluorene-based organic fluorescent materials are promising for applications in organic light-emitting devices (OLEDs). However, many representatives of this class currently fall behind the desired property requirements, such as high charge-carrier mobilities and thermal and electronic stabilities.

Joydev Laha and colleagues, National Institute of Pharmaceutical Education and Research (NIPER), Mohali, India, have developed a synthesis which provides direct access to 7-azaindole- and pyrrole-fused isoindolines and tetrahydroisoquinolines. The researchers used an intramolecular oxidative arylation to access the desired structures, which avoids the difficult regioselective halogenation of N-heterocyclic precursors.

The products were used in the synthesis of N-heterocycle-tethered fluorene-based fluorescent materials with 9,9-dioctyl-9H-fluorene-2,7-diboronic acid bis(pinacol) ester under Suzuki conditions. A broad range of substrates was tested for the synthesis of a variety of functionalized N-heterocyclic products (including aldehydes, halogens, and esters). According to the researchers, this approach is a step towards new fluorescent organic materials for OLEDs.


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