From-core and from-end direct C-H arylations: a step-saving new synthetic route to thieno[3,4-c]pyrrole-4,6-dione (TPD)-incorporated D--π-A-π-D functional oligoaryls.

In contrast to the traditional multistep synthesis, herein an efficient and fewer-steps new synthetic strategy is demonstrated for the facile preparation of organic-electronically important D-π-A-π-D-type oligoaryls through sequential direct CH arylations. This methodology has shown that the synthesis of thieno[3,4-c]pyrrole-4,6-dione (TPD)- or furano[3,4-c]pyrrole-4,6-dione (FPD)-centred target molecules could be accessed step-economically either from the core structure (acceptor) or from the end structure (donor), which supplied a more flexible and succinct new synthetic alternative to the preparation of the π-functional small-molecule semiconducting materials. In addition, optical and electrochemical properties of the synthesized oligoaryls were examined.