posted on 2021-02-16, 16:17authored byAkhil Krishnan R., Sheba Ann Babu, Nitha P. R., Jagadeesh Krishnan, Jubi John
We have developed a metal-free, mild,
and green synthetic route
toward benzothieno[3,2-b]benzofurans by the annulation
of 3-nitrobenzothiophene with phenols. The reaction was found to be
general with a range of substituted phenols. In addition, we could
extend the methodology for the synthesis of pentacenes and could demonstrate
the synthesis in gram-scale. Moreover, we extended the strategy for
the synthesis of benzothieno[2,3-b]benzofurans by
starting from 2-nitrobenzothiophenes.