4
Tetrahedron
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cyclized product C. Finally, the cyclized product
dehydrogenated to desired product.
In summary, an effective and green protocol has been
developed for the one-pot synthesis of benzimidazoles from
easily available aryl alcohols and 1,2-diaminoarenes without
using catalyst or additive under solvent-free conditions. Notable
advantages offered by this strategy are broad substrate scope,
solvent-free, catalyst- and additive-free conditions, high atom-
economy (only water and H2 are by-products), environmentally
benign, higher yields of the desired products and simple work-up
procedure, which make it an attractive and useful alternative to
the existing methods.
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Acknowledgments
We thank the CSIR Network project CSC-0123 for financial
support. M.M.R, M.A.K and M.N acknowledge the financial
support from CSIR, India in the form of fellowship. P.S and K.S
acknowledge the financial support from UGC, India in the form
of fellowship.
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Supplementary data
Supplementary data associated with this article can be found,
at
in the
online
version,
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